fix(stats): event-emit lands without the env var and reports every failure

event-emit returned {written:false, reason:'CLAUDE_PLUGIN_DATA unset'} whenever the harness did not export the variable - the normal case for the Bash tool - so /trekexecute's Phase 8 events never landed. It now resolves the directory through stats-append's resolveStatsDir (one resolver; opts.path still wins, so intent-approval is unchanged). The CLI uses the realpath isMain() guard (the file:// guard was a silent no-op under a symlink or a path with a space) and exits 1 on every written:false - usage error, payload-not-json, failed write - instead of always 0. KNOWN_EVENTS gains main-merge-approved, main-merge-declined and gates_mode_flag_override, which /trekexecute emits by design. Header, intent-approval docstring (comment only), docs/operations.md and the README autonomy sentence (wrong state names, 'records each transition') updated.

Red: 10 of 20 tests fail on the pre-fix code - 7 new (CLI lands with CLAUDE_PLUGIN_DATA empty / absent, unwritable target exit 1, usage error exit 1, symlink, space path, known events) and 3 inverted contracts. Regression guards (green on arrival): never throws when unwritable; no second copy of the fallback directory name.

Inverted (the contract this changes, not deleted): emit with no CLAUDE_PLUGIN_DATA (silent skip) -> lands under a pinned HOME; never throws when unwritable -> a genuinely unwritable target (env {} now resolves to the real home); resolveStatsPath({}) === null -> the fallback path; malformed --payload exit 0 -> exit 1.

Readers checked: otel-export keys on 'event', yardstick counts only user_input, cache-analyzer and research-loop-cap name event-emit only in comments. Verify 268/268 (stats-event-emit, intent-approval, doc-consistency, otel-export-validators, yardstick). Suite 1376 (1374/0/2); non-hook lines in the real trekexecute-stats.jsonl 60 before and after.

Voyage order 20261005T104513Z-1250514346, plan step 2/5.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/operations.md

@@ -14,7 +14,7 @@ All four pipeline commands accept a boolean `--gates {true|false}` flag. Presenc
 | `closed` | high | Stop at every autonomy boundary; operator confirms each transition |
 | `open` | low | Skip optional checkpoints; trust manifests + verify gates only |
 
-Under the hood: `lib/util/autonomy-gate.mjs` runs the state machine `idle → gates_on | auto_running → paused_for_gate → completed`. `start` routes to `gates_on` when `--gates true`, else `auto_running`; a `phase_boundary` from `gates_on` pauses at `paused_for_gate` (awaiting `resume`); `finish` reaches the terminal `completed`. The module is pure data with no I/O. Separately, `lib/stats/event-emit.mjs` records named lifecycle events (`brief-approved`, `main-merge-gate`, `user_input`) to `${CLAUDE_PLUGIN_DATA}/trek*-stats.jsonl`. The main-merge gate is the final autonomy boundary before HEAD lands on `main`.
+Under the hood: `lib/util/autonomy-gate.mjs` runs the state machine `idle → gates_on | auto_running → paused_for_gate → completed`. `start` routes to `gates_on` when `--gates true`, else `auto_running`; a `phase_boundary` from `gates_on` pauses at `paused_for_gate` (awaiting `resume`); `finish` reaches the terminal `completed`. The module is pure data with no I/O. Separately, `lib/stats/event-emit.mjs` records named lifecycle events (`brief-approved`, `main-merge-gate`, `main-merge-approved`, `main-merge-declined`, `gates_mode_flag_override`, `user_input`) to `trekexecute-stats.jsonl` in the plugin data directory (`CLAUDE_PLUGIN_DATA`, else `~/.claude/plugins/data/voyage-ktg-plugin-marketplace/`, the directory `scripts/yardstick.mjs` reads); a write that fails is reported, never skipped. The main-merge gate is the final autonomy boundary before HEAD lands on `main`.
 
 ### Path A/B/C decision (v3.4.0; Path C closed 2026-05-05)