fix(discord): extend channel-name matching to slash-command auth; clamp flush deadline to disconnect budget

Follow-up to the salvaged #8008 fix:
- Sibling-site fix: _evaluate_slash_authorization gated DISCORD_ALLOWED_CHANNELS /
  DISCORD_IGNORED_CHANNELS on numeric IDs only, so name/#name config that now works
  for on_message still silently failed for slash-command interactions. Refactor the
  channel-key helper to _discord_channel_keys_from_channel(channel, parent) and reuse
  it at the interaction gate. Fail-closed on missing channel id is preserved.
- The contributor's hardcoded 8s flush deadline could be hard-cancelled mid-flush:
  _teardown_adapter already wraps cancel_background_tasks() in the per-adapter
  disconnect budget (HERMES_GATEWAY_ADAPTER_DISCONNECT_TIMEOUT, default 5s). The flush
  deadline now derives from that budget with headroom so it always completes inside it.
- AUTHOR_MAP: map cypher@augmentl.com -> Nickperillo for CI.
- Tests: slash-auth name/#name allow + name ignore matching.

scripts/release.py

@@ -45,6 +45,7 @@ ACP_REGISTRY_MANIFEST = REPO_ROOT / "acp_registry" / "agent.json"
 
 # Auto-extracted from noreply emails + manual overrides
 AUTHOR_MAP = {
+    "cypher@augmentl.com": "Nickperillo",  # PR #8008 salvage (Discord channel-name matching + flush pending sends on shutdown)
     "telos@apex-z.com": "telos-oc",  # PR #14353 salvage (propagate custom_providers key_env into ProviderDef.api_key_env_vars; named + bare-custom self-heal paths)
     "256073454+Kolektori@users.noreply.github.com": "Kolektori",  # PR #6436 salvage (require approval for host-bound Docker commands; container guard fast-path)
     "41764686+LIC99@users.noreply.github.com": "LIC99",  # PR #4682 salvage (warn + default to manual on unknown approvals.mode; #4261)