feat(voyage): define high-effort behavior + amend brief Non-Goal/SC1 + coordinator normalization (Decision B)

Wave 6 / Step 10 — autonomy-gated. Operator confirmed: gemini-bridge
substitution for plan-critic doubling AND SC1 amendment to
resolver-invariant encoding (decisions.local.json recorded).

- commands/trekplan.md: gemini-bridge plan-review Pass 2 on
  post-revision plan in high-effort mode (replaces fragile
  plan-critic doubling per risk-assessor).
- commands/trekresearch.md: full swarm + contrarian-researcher +
  gemini-bridge always-on.
- commands/trekreview.md: skip Pass 3 reasonableness + invoke
  coordinator normalization rule.
- commands/trekexecute.md: gates_mode = closed (strict manifest-audit,
  main-merge pauses); flag override still wins.
- agents/review-coordinator.md: Pass 3 high-effort normalization —
  substitute unknown rule_key with PLAN_EXECUTE_DRIFT, preserve
  original in original_rule_key.
- .claude/projects/2026-05-13-trekflow-solo-lane/brief.md (gitignored,
  not committed): Non-Goal amendment locks low/high tiers; SC1
  amendment authorizes resolver-invariant interpretation.
- tests/lib/doc-consistency.test.mjs: +4 pins for the
  "### High-effort behavior (v5.1.1)" heading per command.

Tests: 578 pass, 0 fail, 2 skipped (+4 from 574).

Closes #7 (operator-gated decisions captured + coordinator
normalization landed).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

plugins/voyage/commands/trekexecute.md

@@ -1555,6 +1555,26 @@ without `phase_signals` or `phase_signals_partial: true`), halt with:
 /trekbrief to commit them (Phase 3.5).` Enforcement is validator-only;
 commands surface, don't re-enforce.
 
+### High-effort behavior (v5.1.1)
+
+When `phase_signal_result.effort == 'high'` for the `execute` phase,
+set `gates_mode = 'closed'` automatically (equivalent to passing
+`--gates closed` on the command line). All autonomy boundaries become
+operator-stopping points: manifest-audit FAIL halts immediately, the
+main-merge gate pauses for operator confirm, and Phase 7.5
+manifest-audit runs in its strictest form (fails on ANY mismatch, not
+just deltas above threshold). Operator explicit `--gates` flag still
+wins over the brief signal — if the operator passes `--gates open` on
+the command line while `phase_signal_result.effort == 'high'`, the
+flag takes precedence and the override is logged to
+`${CLAUDE_PLUGIN_DATA}/trekexecute-stats.jsonl` as
+`{event: 'gates_mode_flag_override', flag: 'open', signal_effort: 'high'}`.
+
+Standard effort (or absent): use `gates_mode = 'adaptive'` (the
+default). Low effort: `gates_mode = 'open'` plus sequential-only
+execution (no parallel waves) — existing `--quick`-equivalent
+code-path.
+
 ## Hard rules
 
 1. **No AskUserQuestion for execution decisions.** All execution decisions come