fix(gateway): deliver kanban/delegate wake-ups to api_server sessions via self-post

[ianks]

What does this PR do?

Sessions originated via the stateless api_server platform never received delegate_task(background=true) completions or kanban notification wake-ups. Three root causes:

1. Wrong-session wake — gateway/kanban_watchers.py and gateway/run.py::_inject_watch_notification woke sessions via handle_message() with a build_session_key()-derived key, which never matches the raw X-Hermes-Session-Id key api_server sessions actually run under.
2. Silent notify loss — ApiServerAdapter.send() returns SendResult(success=False) without raising; this was treated as delivered, so the notify cursor advanced past permanently-lost events.
3. Forced-sync delegation — tools/delegate_tool.py forced background delegations to run synchronously on api_server, since there was no way to wake the session afterward.

The fix (new gateway/wake.py) routes wake-ups for non-push adapters through a self-post to /v1/chat/completions with the original session id — the same entry point real turns use to resume a session. Non-raising send failures now rewind the cursor instead of advancing it, and background delegation dispatches async whenever a session id is available to wake, falling back to sync only for session-id-less one-shots.

Related Issue

Root cause for #56580, #64609, #53027, #63169; complements #56531, #50319, and #64113 (which fixes the push-adapter creator-wake path — no conflict).

Type of Change

• Bug fix (non-breaking change which fixes an issue)

How to Test

Targeted suites (tests/gateway/test_wake_delivery.py, test_kanban_notifier_apiserver_wake.py, test_kanban_notifier.py, test_background_process_notifications.py, tests/tools/test_delegate_apiserver_background.py, test_delegate.py) pass — 209 tests. Full tests/gateway tests/tools regression: 17011 passed; the 84 failures are pre-existing/environmental (pass in isolation, none touch files changed here).

Checklist

• I have read the CONTRIBUTING.md guide
• My commit messages follow Conventional Commits
• I searched existing issues/PRs for duplicates (none open)
• This PR contains only related changes
• Relevant tests pass
• I added tests for new functionality

Out of Scope

The chat_type="group" hardcoding in the push-adapter creator-wake path (#56580) is left to #64113. A downstream deployment-specific text-notify fallback was deliberately not generalized here.

[ianks]

Amended: live e2e testing found that the dispatch-time origin capture (HERMES_SESSION_ID) was clobberable — constructing a child agent calls set_current_session_id() with the subagent's internal id right before the dispatch code read it, so the completion wake self-posted into the subagent's own session. The origin is now captured from the request-scoped api_server chat_id binding (which only set_session_vars writes, so it survives child construction), centralized in a helper used by both the delegation dispatch and the kanban task session stamp, and covered by tests that reproduce the clobber.

[tonydwb]

Code Review Summary

Verdict: Approved with Note

Looks Good

• Fix(gateway): deliver kanban/delegate wake-ups to api_server sessions via self-post
• 979 additions, 7 deletions — substantial fix
• No security issues detected

Note

• Some debug/print patterns in diff checked — appear in existing code context, not new artifacts

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Reviewed by Hermes Agent

[teknium1]

Thanks for tracing the raw-session routing problem; current main does force API-server background delegation synchronous (tools/delegate_tool.py:2795-2825), so the premise is real.

Problems

• gateway/kanban_watchers.py:513-608 advances the cursor before deliver_wake() at line 588. A failed/exhausted self-post is caught after the advance, permanently losing the API-server event rather than retrying it.
• /v1/runs creates session_id at gateway/platforms/api_server.py:4419, but binds only session_key at line 4539. The new tools/async_delegation.py:_current_origin_session_id() reads chat_id, so this route still falls back to synchronous execution.
• The new origin_session_id is in-memory only (tools/async_delegation.py:526,728). Durable dispatch persistence and abandoned-delegation recovery omit it (tools/async_delegation.py:134-150,229-260), leaving recovered API completions unroutable.

Suggested changes

• Make the kanban self-post part of the retryable delivery before cursor advancement.
• Bind the /v1/runs raw session ID and add route coverage.
• Persist and restore origin_session_id with durable delegation records.

This is an automated hermes-sweeper review.

[teknium1]

This wake runs only after the cursor has advanced at lines 513-519, and the exception is swallowed at lines 598-608. A 429/connection failure therefore consumes the API-server notification permanently. Please make wake acceptance retryable before advancing the cursor, or rewind when it fails.

[teknium1]

This field is not included in _persist_dispatch()'s durable task_payload, and recover_abandoned_delegations() does not reconstruct it. A restarted gateway will recover the delegation without its raw API-session return address and cannot self-post the completion.

[teknium1]

Merged via PR #70171 — your commit was cherry-picked onto current main with your authorship preserved in git log (f50c3d9). The self-post mechanism and your test suite landed intact; we layered the three fixes from the July 16 review on top as separate commits (cursor advance only after a successful wake post, chat_id binding on /v1/runs, durable origin_session_id persistence). Excellent work on this one — it closes a whole feature class that was silently broken for API-server users. Thanks!