Port of the Slack half of #13855 (by @kshitijk4poor), reimplemented against
the plugin adapter (the original PR targets the deleted
gateway/platforms/slack.py and six other legacy adapters).
Channels listed in slack.require_mention_channels (config.yaml) or
SLACK_REQUIRE_MENTION_CHANNELS ALWAYS require an explicit @mention, even
when require_mention is false globally or the channel is in
free_response_channels — the opposite direction of free_response_channels.
Instead of duplicating the PR's inline reply-to-bot-thread/mentioned-thread/
session checks, the forced channel falls through to the SAME decision chain
as normal mention gating, so all five wake checks in
_should_wake_on_unmentioned_message keep applying (single decision path).
Credit: adapted from #13855 by @kshitijk4poor (Slack half only; the other
platform halves target deleted legacy adapters and are out of scope for
this cluster).
The ignore_other_user_mentions gate relied solely on is_mentioned, which
only recognises exact <@UID> markup, so a message mentioning the bot in
pipe form (<@UID|name>) alongside a leading other-user mention was
wrongly suppressed. The gate now also scans for the bot's own mention in
either markup before ignoring a message.
Claude-Session: https://claude.ai/code/session_01TKsNdptNdo9CqT2u7JMdkH
Once the bot is @mentioned in a Slack thread it auto-follows and replies
to every later message in that thread, including ones a human addresses to
another human (e.g. "@rasha check this out"). The bot butts in.
Add slack.ignore_other_user_mentions (env SLACK_IGNORE_OTHER_USER_MENTIONS,
default off). When on, a channel/thread message whose first token @mentions
someone other than the bot is treated as addressed to that person and the
bot stays silent unless it is also mentioned. This is Slack parity for the
Discord option of the same name (#33501), adapted to Slack's thread model:
the trigger is a leading mention ("addressed to"), so a message that merely
references another user mid-sentence still reaches the bot.
The gate sits ahead of the free-response / require_mention ladder so it also
overrides the mentioned-thread auto-follow. DMs are never filtered.
Follow-up rework on the #51627 cherry-pick:
- Guard the 5th wake check (parent-mentioned-bot, #24848) against a None
parent_text — _fetch_thread_parent_text is typed to return str but tests
(and defensive callers) can surface None; 'in None' raised TypeError.
- Drop the PR's fixture-level _fetch_thread_parent_text/_fetch_thread_context
AsyncMocks from TestThreadReplyHandling/TestAssistantThreadLifecycle: main's
#24848 tests exercise the real parent-text path via conversations_replies
side effects, and the blanket mocks broke them.
- _resolve_user_is_bot reworked to the workspace-scoped (team_id, user_id)
cache key introduced by the multi-workspace name cache on main.
Slack delivers user mentions as opaque IDs (<@U123>). The agent had no
way to tell one participant from another — or from itself — so it could
misread a mention of a human as a self-mention and answer messages
addressed to that person (the "bot thinks it's @someone-else" bug).
Two cooperating fixes:
- _humanize_user_mentions rewrites remaining <@UID> tokens (the bot's
own mention is stripped earlier) to @DisplayName in the trigger text
and reply_to_text — the Slack equivalent of Discord's clean_content.
Handles the labelled <@UID|handle> form; unresolvable IDs fall back
to the raw ID.
- _build_identity_prompt injects an ephemeral per-turn system-prompt
line via the channel_prompt seam (applied at API-call time, never
persisted — prompt caching preserved) naming the bot's own workspace
handle (per-team in multi-workspace installs) so the agent has a
positive "that's me" anchor.
Salvaged from #55340 by @benbarclay, rebased over the workspace-scoped
user-name cache (team_id-aware resolution) on main.
Two mention-tracking gaps around thread parents (#24848):
1. When a thread PARENT @-mentioned the bot (e.g. '<@bot> check this
and ask me before running'), a later bare reply like 'run' fell
through every wake check if the mention event predated this process
(restart) — _mentioned_threads is in-memory only. Add a 5th wake
check that fetches the parent text (with the bot mention preserved
via strip_bot_mention=False) and wakes when the parent addressed the
bot, registering the thread so later replies skip the fetch.
2. A TOP-LEVEL @mention starts a thread (session keying falls back to
the message ts), but only the raw event thread_ts was registered in
_mentioned_threads — so replies to a top-level mention did not
auto-trigger. Register the session-scoped thread_ts instead.
_fetch_thread_parent_text reuses the shared thread-context cache (raw
payloads) so the parent check costs at most one conversations.replies
call per thread; _register_mentioned_thread centralizes the bounded-set
eviction.
Salvaged from #24848 by @kaiyisg, rebased onto the extracted
_should_wake_on_unmentioned_message helper.
The un-mentioned wake decision relied on three checks: thread root in
_bot_message_ts (populated only by the adapter's own send() path),
_mentioned_threads (populated on @mention), and an existing session.
Two gaps (#63530):
- Gap A: bot messages posted OUTSIDE gateway send() — skills/scripts
calling chat.postMessage directly, cron/API posts — never enter
_bot_message_ts, so human replies in those threads were silently
dropped.
- Gap B: _bot_message_ts is process memory; after a gateway restart the
bot stopped waking on replies to threads it started before the
restart.
Fix: add a 4th, API-derived check — _bot_authored_thread_root — which
resolves the thread root's author via conversations.replies (cached in
_thread_context_cache via the new parent_user_id field, TTL-bounded).
Root authorship comes from Slack itself, so it covers outside-send
posts and survives restarts, unlike in-memory ts tracking. The wake
decision is extracted into _should_wake_on_unmentioned_message for
direct unit testing; the legacy checks remain first (cheap, additive).
Fixes#63530.
Salvaged from #64067 by @knoal (author metadata normalized to their
GitHub identity), rebased over the thread-context formatter split and
extended with per-team bot-id resolution for multi-workspace installs.
Persistent sessions survive gateway restarts, but thread replies posted
while the gateway was DOWN never reached the session — and the adapter
had no way to notice, so the conversation silently resumed with a hole
in it.
On the first ordinary reply per thread after a restart (tracked by a
fresh-process _thread_rehydration_checked set), fetch the thread delta
past the persisted per-session watermark and inject any missed messages
as part of the new turn via channel_context. Exactly-once per thread
per process; when the watermark is empty (pre-feature sessions) the
check is a no-op. Steady-state replies keep advancing the watermark so
rehydration never re-injects messages the session already carries as
ordinary turns. Prior history is never rewritten (prompt caching safe).
Builds on the persisted watermark introduced for #23918.
Salvaged from #33215 by @vexclawx31, reworked from a repeated
full-thread injection guard into a watermark-delta injection so
rehydration adds only what the session actually missed.
Once a thread has an active session, a later reply that explicitly
@mentions the bot did not re-fetch Slack thread context, so the agent
missed messages added to the thread after the initial hydrate (e.g.
other bots/integrations replying in multi-agent workflows). The
explicit mention is a fresh intent signal and now triggers a refresh.
Mechanics:
- SessionEntry gains a small persisted metadata dict, with
SessionStore.get/set_session_metadata accessors (survives gateway
restarts via the routing index).
- The adapter stores a per-thread consumption watermark
(slack_thread_watermark:<channel>:<thread>) recording the last
thread ts the session consumed.
- On explicit mention in an active thread, _fetch_thread_context runs
with force_refresh=True (bypassing the TTL cache) and after_ts=<the
watermark>, so only NOT-yet-seen messages are injected — as part of
the new turn via channel_context. Prior conversation history is
never rewritten, preserving prompt caching.
- _fetch_thread_context caches raw conversations.replies payloads so
watermark-scoped re-formatting needs no extra API call; formatting
is split into _format_thread_context.
- Thread session keys are built once in _build_thread_session_key
(shared by the wake gate and the watermark accessors), still via
build_session_key().
Fixes#23918. Supersedes #62299 (keyword-triggered refresh limited to
'investigate' prompts — the mention signal is the general fix).
Salvaged from #23927 by @heathley, rebased onto the plugin adapter
layout and rerouted through channel_context instead of text-prepend.
Prepending cold-start thread backfill directly onto the message text
moved a recognized command (e.g. a bang-normalized "!queue ...") away
from character zero, so downstream command routing misclassified it as
conversational text and the command silently didn't run.
Route the backfill through MessageEvent.channel_context instead —
gateway.run already prepends channel_context after command dispatch
("[New message]" framing), so commands keep their COMMAND type while
the recovered history stays available to the agent.
Supersedes #68020, which dropped the fetched context entirely for
commands instead of preserving it out-of-band.
Salvaged from #66069 by @LevSky22.
_fetch_thread_context unconditionally filtered out the bot's own prior
replies, so cold-start sessions (bot posts a thread root, user replies
later, no active session) lost every assistant turn and the agent could
not reconstruct the prior conversation.
The circular-context concern the filter guarded against does not apply
here: the call site is gated by _has_active_session_for_thread, so this
method only runs when there is no session history to duplicate.
Self-bot replies are now kept and labelled with an explicit [assistant]
prefix (skipping user-name resolution — the label already communicates
authorship). Third-party bot posts and the bot-authored thread parent
keep their existing treatment.
Fixes#38861.
Salvaged from #38936 by @temalo, rebased from the pre-plugin
gateway/platforms/slack.py layout onto plugins/platforms/slack/adapter.py
(preserving the [unverified] trust-tag handling added on main since).
A session key that exists in the store but would be rolled to a fresh
session by the reset policy (daily/idle/suspended) is not an active
session. Treating it as active suppressed the first-turn Slack
thread-history reseed after reset (#55239).
_has_active_session_for_thread() now consults SessionStore._should_reset
so a stale entry gates like a missing one, letting _fetch_thread_context
reseed the fresh session with recent thread history.
Fixes#55239.
Salvaged from #55240 by @ooiuuii.
Slack buffers un-acked Socket Mode events and replays them when the
websocket reconnects; the replay can arrive several minutes later —
past the 300s default dedup TTL — producing a duplicate bot reply.
Default the Slack dedup window to 1 hour (memory stays bounded by the
deduplicator's max_size LRU pruning) and allow overriding via
SLACK_DEDUP_TTL_SECONDS.
Salvaged from PR #40064 by @MrAbsaroka (reapplied onto the
plugin-migrated adapter path). Fixes#4777.
The Socket Mode watchdog only reconnects when is_connected() returns False
or the receiver task dies. When the underlying aiohttp ClientSession is
closed (e.g. after a network blip), slack_sdk gets stuck retrying
"Session is closed" while is_connected() can still report healthy and the
receiver task stays alive — so the watchdog never fires and the process is
alive but deaf to Slack indefinitely.
Add a ping/pong staleness probe: Slack sends a ping roughly every
ping_interval seconds even on an idle socket, so a stale/missing
last_ping_pong_time (past a first-ping grace window) is a reliable signal
the transport is wedged. The watchdog now also reconnects on staleness,
which rebuilds the handler with a fresh session. Guards non-numeric
attributes so a mocked/partial client never triggers a spurious reconnect.
7 new tests; full test_slack.py (216) green.
SocketModeClient.connect() is a "while True" retry loop that never checks
the client's closed flag, so anything still inside it when the shared
aiohttp session is closed keeps retrying against a session that can never
work again. That is the "Failed to connect (error: Session is closed);
Retrying..." spam in #46990, at a steady ping_interval cadence that only
a process restart clears.
_stop_socket_mode_handler closed the handler first and cancelled
afterwards, which loses the race. close_async() closes that shared
session, and three things can be inside connect() when it does: our own
start_async task, monitor_current_session() (on staleness) and
receive_messages() (on a CLOSE frame), the latter two reaching it
independently through connect_to_new_endpoint(). connect() also rebinds
current_session_monitor and message_receiver to fresh tasks when it
succeeds, so the set of live tasks changes across the awaits inside
close(). Cancelling from a snapshot taken partway through races a moving
target rather than closing the window.
So cancel all four before close_async() instead. With nothing left alive
to enter connect(), no rebinding can happen during teardown and the
window cannot open at all. The client's task attributes are read with
getattr so a rename inside the SDK degrades to a no-op instead of raising
during shutdown, and the wait is asyncio.wait with a timeout rather than
an unbounded await, so a task wedged in a network call cannot hold up
shutdown.
The underlying SDK defect is tracked at slackapi/python-slack-sdk#1913.
This replaces the earlier version of this change, which added a closed
session check when building a handler and another in the watchdog. Both
are unnecessary once teardown stops leaking tasks: each
AsyncSocketModeHandler builds its own SocketModeClient with a fresh
ClientSession, so a new handler cannot inherit a closed session, and the
current handler's session is only closed by the teardown path itself.
Dropping the watchdog check also keeps this off the ping/pong staleness
trigger proposed in #52923, which addresses a wedged live connection
rather than a leaked one.
Fixes#46990
A platform with a missing dependency or missing credentials can never
succeed on retry, but connect() returned bare False, so the gateway
treated the failure as transient and queued it for background
reconnection — looping forever at the backoff cap. Set
_set_fatal_error(..., retryable=False) for missing-dependency and
missing-credential failures in the Slack, Telegram, and Discord
adapters so the reconnect watcher drops them from the retry queue.
Salvaged from PR #31057 by @dskwe (reapplied onto the plugin-migrated
adapter paths). Fixes#31049.
Missing SLACK_BOT_TOKEN / SLACK_APP_TOKEN is a permanent configuration
error, not a transient outage. Without a fatal-error marker the gateway
queued Slack for background reconnection and looped forever (#66696).
Set _set_fatal_error(..., retryable=False) so the reconnect watcher
drops it from the retry queue, and point the log/error text at
`hermes gateway setup` / the profile's ~/.hermes/.env.
Salvaged from PR #66720 by @x7peeps. Fixes#66696.
Slack now overrides send_clarify to render multi-choice clarify prompts
as native Block Kit buttons (one per choice + a final '✏️ Other…'
free-text button), mirroring the Telegram/Discord adapters and the
existing Slack approval-button pattern.
- Unique hermes_clarify_choice_<idx> action_ids (Slack rejects
duplicate action_ids within one actions block); dispatch via a
compiled-regex action matcher plus hermes_clarify_other.
- Chunks elements across actions blocks in groups of 5 so a larger
choice list degrades gracefully instead of 400ing (invalid_blocks).
- Choice taps resolve through tools.clarify_gateway
.resolve_gateway_clarify with the canonical registered choice text —
the same applier the typed-reply path uses — then edit the message
to show the outcome and drop the buttons.
- 'Other' flips the entry into text-capture via mark_awaiting_text
(only on tap, never at send time) so the gateway text-intercept
captures the next typed message.
- Auth-gated via _is_interactive_user_authorized; atomic-pop
double-click guard mirrors _approval_resolved; late taps on evicted
entries surface an honest expiry notice instead of a false ✓.
- Open-ended prompts delegate to the base plain-text render.
Salvaged from PR #61943 by @100yenadmin. Earliest implementation of
this feature was PR #28885 by @cypres0099; sibling implementations
#66606 (@jaaro-ai) and #51547 (@Mongol-Jimmi) are superseded.
Closes#52369
teknium1 review on #57690: harvesting logic was skipping the ENTIRE merged
row when a compaction summary was appended to the tail message, discarding
real prior user content that context_compressor retains before the
_MERGED_SUMMARY_DELIMITER. Extract and harvest that pre-delimiter segment
instead of dropping it wholesale.
Revert-to-fail: reverting plugins/memory/holographic/__init__.py alone
drops test_merged_into_tail_preserves_genuine_pre_delimiter_preference
(19 passed, 1 failed); restoring the fix returns 20/20 passed.
Two compounding defects in the holographic memory provider (#57682):
1. The on_session_end gate used plain truthiness on auto_extract, but the
plugin's own config schema declares it as a string enum with default
"false" — and not "false" is False, so extraction ran for users who
had it configured off. Coerce with the shared utils.is_truthy_value
(same fix class as the merged byterover no-op fix).
2. _auto_extract_facts scanned every role=user message. Context-compaction
handoff summaries can be inserted as role=user messages and their prose
reliably matches the decision patterns (we decided/agreed, the project
uses), so the compactor's own output was persisted as a durable project
fact on every rollover following a compaction — recreated even after
manual deletion.
Adds agent.context_compressor.is_compaction_summary_message(), a public
helper that prefers the in-process COMPRESSED_SUMMARY_METADATA_KEY marker
and falls back to _is_context_summary_content() (covers merged-into-tail
and historical prefixes), since the metadata key is stripped by wire
sanitizers and doesn't survive all session-store round-trips. The plugin
skips summary messages before pattern matching.
Fixes#57682
Consolidated defensive layer for the invalid_blocks / msg_too_long bug
class (#56615, #62054, #53693): one malformed or oversized block fails
the ENTIRE chat.postMessage / chat.update call, so approval cards never
update and messages silently drop.
New block_kit.sanitize_blocks() is applied at every call site that
attaches blocks (send/edit via _maybe_blocks, send_exec_approval,
send_slash_confirm, and the approval/slash-confirm chat.update button
handlers). It:
- truncates section/context text to the 3000-char cap with an ellipsis
(covers interaction payloads where Slack's HTML-escaping of < > &
inflates text past the limit budgeted at send time)
- truncates header text to its 150-char cap
- drops empty blocks (no text / elements / rows)
- replaces null table column_settings entries with {} and trims
default trailing entries (Slack requires every entry be an object)
- caps the payload at Slack's 50-block maximum
- returns None when nothing valid remains so callers fall back to the
plain-text payload; never raises
Also registers contributor mappings for the salvaged PRs in this
cluster (tw0316, kamonspecial, sowork-skills).
Slack's chat.update enforces the same ~40k character limit as
chat.postMessage, but edit_message sent the formatted text unchunked —
an oversized edit failed outright with msg_too_long and the message
was never updated. Unlike send() we cannot split an edit into multiple
messages, so truncate to MAX_MESSAGE_LENGTH via the shared chunker
(which preserves code-block boundaries) and keep the first chunk.
Reapplied from PR #33224 (targeted the pre-plugin gateway/platforms/slack.py
path) onto plugins/platforms/slack/adapter.py.
Slack API returns `no_text` error when `chat.postMessage` is called
with empty or whitespace-only text. This happens when cron delivery
posts a response before the agent produces content (e.g. malformed
turn before [SILENT]).
Add early-return guards in both code paths:
- `_standalone_send()`: out-of-process cron delivery via Web API
- `send()`: in-process gateway adapter
Both paths now skip the API call and return success when the formatted
message is empty or whitespace-only.
Fixes#52663
Slack re-escapes HTML entities in the interaction payload
(< -> <, > -> >, & -> &), inflating the section text
past the 3000-char Block Kit limit when the button handler
rebuilds updated_blocks for chat.update.
The send path already budget-truncates, but the click handlers
used the echoed original_text verbatim. Cap it to 3000 chars
in both _handle_approval_action and _handle_slash_confirm_action.
Fixes#53693
assert statements are stripped when Python runs with -O flag. Replace
the assert cur is not None in _rich_text_list_block() with an explicit
if/continue guard. The assert is technically unreachable (first loop
iteration always sets cur), but using assert for invariant checking in
production code is fragile under optimization.
Slack rejects a rich_text_section / rich_text_preformatted / rich_text_quote
whose elements list is empty or contains a zero-length text element, and a
header whose plain_text is empty. The Block Kit renderer emits exactly those
shapes for common inputs: a markdown table with a blank cell or a ragged
(short) row, an empty fenced code block, a blank quote line, an empty list
item, and an emphasis-only header ("# ***"). Any one of them poisons the
whole payload — chat.postMessage fails with invalid_blocks ("missing element"
/ "must be more than 0 characters") and the message loses its rich rendering
entirely.
Route every rich_text builder's child elements through _nonempty_elements
(drop zero-length text elements; substitute a single space when nothing
remains) and skip headers that reduce to empty after markdown-marker
stripping. Observed in production via live chat.postMessage rejections;
regression tests cover each case plus a well-formed-content control.
Complementary to #56618 (column_settings hardening + no-blocks retry): that
change makes Block Kit rejections recoverable, this one makes the common
empty-content cases render correctly in the first place. No overlapping hunks.
Bot-posted alerts (Honeycomb, PagerDuty, Datadog, GitHub bot, etc.) carry
their actionable content — section text, button URLs — in Block Kit
blocks, while the plain text field holds only the alert title.
_fetch_thread_context and _fetch_thread_parent_text only read
msg.get('text'), so that content never reached the agent.
Add a _render_message_text helper that merges top-level text with
readable block content, section/header/context text, actionable URLs,
and (folded in from #61261 during conflict resolution) legacy
attachment fields, and use it for thread-context and parent-text
rendering.
Salvaged from #29541.
`_fetch_thread_context` and `_fetch_thread_parent_text` only read each
message's plain `text` field, so messages posted by apps (Alertmanager,
Grafana, PagerDuty, CI bots) — which carry their content in legacy
`attachments` or Block Kit `blocks` with an empty `text` — were dropped
entirely. When such a message *starts* a thread (e.g. an alert), a bot
mentioned mid-thread to investigate sees an empty thread and can only ask
"what should I investigate?".
Fall back to the existing `_extract_text_from_slack_blocks` and a new
`_extract_text_from_slack_attachments` helper when `text` is empty, so
app-posted alerts and notifications are visible in fetched thread history.
Adds TestThreadContextAppMessages (attachment-only, blocks-only, and
empty-message cases).
Closes#52387
Slack messages can carry the bot @mention only inside Block Kit `blocks`
(a `rich_text` section with a `user` element), with the flat top-level
`text` containing just a fallback string. Both mention gates read only the
flat `text`:
- the `allow_bots: mentions` bot-message filter, and
- the `is_mentioned` channel router (`routing_text = original_text`)
so such messages were silently dropped — `allow_bots: mentions` was
effectively non-functional for Block-Kit senders, and the same blind spot
hit `require_mention` / `strict_mention`.
Add `_collect_slack_block_mentions()` (walks blocks, recovers `<@UID>`
tokens from non-quoted rich-text `user` elements) and
`_slack_mention_detection_text()` (flat text + recovered mentions). Both
gates now use the merged detection text. Mentions nested in
`rich_text_quote` are deliberately ignored, preserving the existing
contract that quoted/forwarded content can't trick the bot. Also emit a
debug line when a bot message is dropped so silent drops are diagnosable.
Tests: 4 new cases in tests/gateway/test_slack_mention.py (Block-Kit
mention recovered, flat-text passthrough, no-mention, quoted-mention
ignored). 275 slack tests pass.
* feat(nous): send top-level session_id for provider sticky routing
The Nous Portal profile only embedded the session id inside portal tags,
so Claude traffic through the portal had no sticky-routing key. Multi-turn
sessions could reroute between upstream endpoints (Anthropic/Vertex/
Bedrock), cold-writing a fresh prompt cache on every reroute since each
provider's cache is instance-local.
Mirror the OpenRouter profile: emit extra_body.session_id whenever the
agent has one, pinning every turn of a session to the same endpoint so
explicit cache_control breakpoints stay warm.
* test: expect top-level session_id in Nous max-iterations summary body
Sibling site of the profile change — the max-iterations summary path
builds its request through the same NousProfile.build_extra_body(), so
its exact-shape assertion now includes the sticky-routing session_id
when the agent has a session.
The _profile_prefetched_sessions set stores whichever session_id was
passed to prefetch(), which may differ from self._session_id. On
compression, only old_session_id (self._session_id) was discarded,
missing the case where the stored key was the prefetch session_id
parameter. Discard both old and new IDs to cover all cases.
- Remove dead current_sid parameter from _recover_pending_sessions
- Remove dead cleanup parameter from _release_owner_run_claim (always True)
- Set _run_lock_path after flock succeeds, not before
- Collapse redundant BlockingIOError branch (covered by OSError+errno check)
- Track _pending_marked_sids to skip re-writing marker file on every sync_turn
Preserve ordered structured turns across OpenViking's 100-message batch limit and resume retries from the first unconfirmed message.
Based on the OpenViking batching work from commit 1a567f7067 in #58981.
- Update test_observed_group_context_preserves_slash_command_text_for_dispatch
to assert user_id is preserved for COMMAND messages (new correct behavior)
- Add _coerce_allow_set helper to handle both list and comma-separated
string allowlist inputs (prevents character-by-character iteration bug)
- Include 'channel' in chat_type checks for group-scoped authorization
- Add _telegram_extra fallback for group_allowed_chats (consistent with
group_allow_from fallback)
- Add AUTHOR_MAP entry for nyaruko@hermes -> tsuk1nose
- authz_mixin: add config.extra fallback for group_allowed_chats
when observe-unmentioned mode strips user_id from env-var check
- authz_mixin: check adapter allow_from/group_allow_from for
user authorization from config.yaml without env vars
- telegram/adapter: separate group_allow_from for group chats
vs allow_from for DMs
- telegram/adapter: preserve sender source for command messages
so admin-only slash commands work in groups
- telegram/adapter: add _telegram_extra fallback for
group_allow_from config reading
Widen the allow_session tier from Matrix to every adapter the gateway
notifies: Telegram, Discord, Slack, Feishu, and Teams gate their Session
button on it; WhatsApp Cloud and qqbot accept the kwarg (no session tier
in their button sets). Also thread allow_session through the plugin-
escalation gate, the execute_code guard payload, and the plain-text
fallback so every notify path carries the same capability flags.
Adds an allow_session flag to the gateway approval payload so adapters
can render the session tier independently of the permanent tier. Matrix
gains a session reaction (🌀) and a reaction legend; pure-tirith prompts
now offer once/session/deny instead of collapsing to once/deny.
Salvaged from PR #67312, adapted to the allow_permanent semantics that
landed in #68597 (Always offered when any dangerous-pattern warning is
persistable; pure-tirith prompts stay session-max).
