feat(gateway): per-platform admin/user split for slash commands (salvage of #4443) (#23373)

* feat(gateway): per-platform admin/user split for slash commands

Adds an opt-in two-list access control on top of the existing per-platform
`allow_from` allowlists, scoped to slash commands only:

  - allow_admin_from         — full slash command access
  - user_allowed_commands    — what non-admins may run
  - group_allow_admin_from   — same, group/channel scope
  - group_user_allowed_commands

When `allow_admin_from` is unset for a scope, gating is disabled and every
allowed user keeps full access (backward compat). Plain chat is unaffected.
`/help` and `/whoami` are always reachable so users can see what they
can run.

Gate runs at the slash command dispatch site in gateway/run.py and uses
`is_gateway_known_command()`, so it covers built-in AND plugin-registered
commands through the live registry without per-feature wiring.

Adds `/whoami` showing platform, scope, tier, and runnable commands.

Salvage of PR #4443's permission tier work, scoped down. The full tier
system, tool filtering, audit log, usage tracking, rate limiting,
`/promote` flow, and persistent SQLite stores are not included here —
those can be re-expanded later if needed.

Co-authored-by: ReqX <mike@grossmann.at>

* fix(gateway): close running-agent fast-path bypass + add coverage and central docs

The slash command access gate was only applied at the cold dispatch site
(line ~5921). When an agent was already running, the running-agent
fast-path block (line ~5574) dispatched /restart, /stop, /new, /steer,
/model, /approve, /deny, /agents, /background, /kanban, /goal, /yolo,
/verbose, /footer, /help, /commands, /profile, /update directly
without going through the gate — letting non-admins bypass gating just
because an agent happens to be busy.

Refactored the gate into _check_slash_access() and called from BOTH
paths. /status remains intentionally pre-gate so users can always see
session state.

Also added 18 more dispatch tests covering:
  - Running-agent fast-path: blocks non-admin, allows admin, /status
    always works
  - Alias canonicalization (gate uses canonical name, not user alias)
  - Unknown / unregistered commands pass through (don't false-positive)
  - DM admin scope-locked when group has its own admin list
  - Multi-platform isolation (Discord gated, Telegram unrestricted)

Docs: added Slash Command Access Control section to the central
messaging index page + /whoami row in the chat commands table.

Co-authored-by: ReqX <mike@grossmann.at>

---------

Co-authored-by: ReqX <mike@grossmann.at>
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@ -134,6 +134,7 @@ hermes gateway status --system # Linux only: inspect the system service
| `/retry` | Retry the last message |
| `/undo` | Remove the last exchange |
| `/status` | Show session info |
| `/whoami` | Show your slash command access on this scope (admin / user / unrestricted) |
| `/stop` | Stop the running agent |
| `/approve` | Approve a pending dangerous command |
| `/deny` | Reject a pending dangerous command |
@ -221,6 +222,33 @@ hermes pairing revoke telegram 123456789 # Remove access
Pairing codes expire after 1 hour, are rate-limited, and use cryptographic randomness.
### Slash Command Access Control
Once users are allowed in, you can split them into **admins** (full slash command access) and **regular users** (only the slash commands you explicitly enable). This applies per platform and per scope (DM vs group/channel) and works through the live command registry, so it covers built-in AND plugin-registered slash commands without per-feature wiring.
```yaml
gateway:
platforms:
discord:
extra:
allow_from: ["111", "222", "333"]
allow_admin_from: ["111"] # admins → all slash commands
user_allowed_commands: [status, model] # what non-admins may run
# Optional: separate group/channel scope
group_allow_admin_from: ["111"]
group_user_allowed_commands: [status]
```
Behavior:
- A user in `allow_admin_from` for a scope can run **every** registered slash command.
- A user in `allow_from` but not in `allow_admin_from` can only run commands in `user_allowed_commands`, plus the always-allowed floor: `/help` and `/whoami`.
- Plain chat is unaffected. Non-admins can still talk to the agent normally; they just can't trigger arbitrary commands.
- **Backward compat:** if `allow_admin_from` is not set for a scope, slash gating is disabled for that scope. Existing installs keep working with no changes.
- DM admin status does not imply group/channel admin status. Each scope has its own admin list.
Use `/whoami` from any platform to see the active scope, your tier (admin / user / unrestricted), and which slash commands you can run. See the [Telegram](/docs/user-guide/messaging/telegram#slash-command-access-control) and [Discord](/docs/user-guide/messaging/discord#slash-command-access-control) pages for platform-specific examples.
## Interrupting the Agent
Send any message while the agent is working to interrupt it. Key behaviors: