glm-5.3-flash 58d0b86ec5 feat(observe): land the decline-path event vocabulary (w3-decline-tracing)
The wave-2 gate's booked finding: observability on the decline paths.
`tracing` rides the manifest per the ADR-002 toolkit but nothing in
src/ emitted — a decline's "reason" was only the routing decision
documented per build.

- src/observe.rs: the event vocabulary, adopting the family posture
  read from alktty/alktunnels/alkcall/alkhttp (free tracing fns,
  message-last lowercase, flat fields; no info!/trace!, no macros,
  no spans): feature_build + row + channel_id + decline_class
  (open/request/serving/auth) + reason + exec_route (exec rows);
  declines at debug, the serving-path failure arm the vocabulary's
  one warn
- handler.rs: every decline site emits — auth dispositions
  (non-ed25519 / fingerprint-unresolved / the four unimplemented
  methods), open-level declines (unfeatured / never-feature /
  cap-exceeded / tunnel connect-failed stub), request-level
  capability declines (exec route-aware, subsystem, env, x11, agent,
  the -R listen forms), and the seam-stub serving declines with the
  spawned-path lifecycle (started / ended / failed — the shape the
  wave-3 mappings inherit)
- tests/observe.rs: the event-presence pin — a hand-rolled global
  capture subscriber (the recorded test convention; no event-capture
  precedent exists in the family), field-matching rows across the
  default/git/session/tunnel/--all-features builds, and the safety
  scan (no username, no fingerprint ever in an event)
- helper-level exact shapes pinned in src/observe.rs unit rows

Verification: cargo test (default, --features git/session/tunnel,
--all-features all green), clippy x2 --all-targets -D warnings,
fmt --check, cargo doc --no-deps 0 warnings, taskgraph validate.
2026-10-28 17:50:49 +00:00
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