diff --git a/plugins/voyage/agents/review-coordinator.md b/plugins/voyage/agents/review-coordinator.md
index c38570a..ed6df5d 100644
--- a/plugins/voyage/agents/review-coordinator.md
+++ b/plugins/voyage/agents/review-coordinator.md
@@ -112,6 +112,18 @@ Drop findings that fail ANY of these tests:
 In `quick` mode, skip this pass entirely. Note the skip in the
 Executive Summary so the reader knows reasonableness was not applied.
 
+**High-effort normalization (v5.1.1):** When the review is invoked
+under high-effort mode (`phase_signals[review].effort: high`), Pass 3
+reasonableness filtering is bypassed. To prevent unknown rule_keys
+from polluting downstream plans, the coordinator MUST substitute any
+rule_key not exported from `lib/review/rule-catalogue.mjs:RULE_KEYS`
+with the literal string `PLAN_EXECUTE_DRIFT` (the most general drift
+category from the 12-entry catalogue). The original rule_key is
+preserved in the finding's `original_rule_key` field for diagnostic
+purposes. This normalization happens BEFORE writing review.md,
+ensuring all `rule_key` values in the final review match the
+catalogue.
+
 ### Pass 4 — Compute verdict
 
 Count findings by severity AFTER dedup and filtering. Verdict thresholds:
diff --git a/plugins/voyage/commands/trekexecute.md b/plugins/voyage/commands/trekexecute.md
index b9804c0..d6b8115 100644
--- a/plugins/voyage/commands/trekexecute.md
+++ b/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
diff --git a/plugins/voyage/commands/trekplan.md b/plugins/voyage/commands/trekplan.md
index f013d5d..b7e30ce 100644
--- a/plugins/voyage/commands/trekplan.md
+++ b/plugins/voyage/commands/trekplan.md
@@ -934,6 +934,25 @@ one-line message: `Brief is brief_version 2.1 but does not carry phase_signals
 — re-run /trekbrief to commit them (Phase 3.5).` Enforcement is
 validator-only; this surface just makes the friendly hint readable.
 
+### High-effort behavior (v5.1.1)
+
+When `phase_signal_result.effort == 'high'` for the `plan` phase, after
+Phase 9 (plan-critic + scope-guardian dedup pass) runs to completion on
+the post-revision plan, run an ADDITIONAL `gemini-bridge` plan-review
+pass on the post-revision plan. Surface its findings as a separate
+`## Adversarial Pass 2 (gemini-bridge, v5.1.1 high-effort)` section
+appended to plan.md before the trailing JSON block.
+
+Rationale (per risk-assessor finding + Decision B substitution
+2026-05-14): the originally-considered "extra plan-critic-iterasjon"
+risked a revision-loop because plan-critic dedup keys on
+`(file, line, rule_key)` triplets and post-revision line numbers shift.
+The gemini-bridge pass is independent (different agent, different
+perspective) and does not re-tread the same dedup space — it surfaces
+genuinely new findings rather than re-emitting closed ones.
+
+Standard and low effort: do NOT run the additional pass.
+
 ## Hard rules
 
 - **Brief-driven**: Every plan decision must trace back to a section of the
diff --git a/plugins/voyage/commands/trekresearch.md b/plugins/voyage/commands/trekresearch.md
index 39a1dc7..f5a7169 100644
--- a/plugins/voyage/commands/trekresearch.md
+++ b/plugins/voyage/commands/trekresearch.md
@@ -481,6 +481,24 @@ 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 `research` phase,
+run the FULL swarm regardless of normal triggering rules: 5 local
+agents + 4 external agents + 1 bridge agent, AND force
+`contrarian-researcher` AND `gemini-bridge` to always-on. Normally
+`contrarian-researcher` triggers conditionally when a leading
+recommendation is emerging from initial agents; in high-effort mode it
+runs unconditionally so the final brief always carries an adversarial
+counter-evidence pass. Similarly, `gemini-bridge` normally activates on
+significant architectural questions or when triangulation value is
+high; in high-effort mode it runs unconditionally to provide an
+independent second opinion.
+
+Standard effort (or absent): use the existing conditional triggers.
+Low effort: inline research only, no agent swarm (existing
+`--quick`-equivalent code-path).
+
 ## Hard rules
 
 - **No planning:** This command produces research briefs, not implementation plans.
diff --git a/plugins/voyage/commands/trekreview.md b/plugins/voyage/commands/trekreview.md
index 5a72a9b..4fd24b3 100644
--- a/plugins/voyage/commands/trekreview.md
+++ b/plugins/voyage/commands/trekreview.md
@@ -398,6 +398,25 @@ phase_signals — re-run /trekbrief to commit them (Phase 3.5).`
 Enforcement is validator-only; this surface just makes the friendly hint
 readable.
 
+### High-effort behavior (v5.1.1)
+
+When `phase_signal_result.effort == 'high'` for the `review` phase,
+skip Pass 3 (Cloudflare reasonableness filter) in
+`agents/review-coordinator.md`. Passes 1, 2, and 4 still run.
+Rationale: high-effort review trusts the operator to weigh borderline
+findings rather than have the coordinator drop them. To prevent
+unknown `rule_key` values from polluting downstream remediation plans
+(Handover 6), the coordinator applies its v5.1.1 high-effort
+normalization rule — substituting unknown `rule_key` values with the
+literal string `PLAN_EXECUTE_DRIFT` (the most general drift category
+in the 12-entry catalogue) and preserving the original in
+`original_rule_key`. See `agents/review-coordinator.md` § Pass 3
+"High-effort normalization (v5.1.1)" for the full normalization spec.
+
+Standard effort (or absent): run all 4 passes as usual.
+Low effort: skip the brief-conformance reviewer entirely (existing
+`--quick`-equivalent code-path).
+
 ## Hard rules
 
 - **Brief is the contract.** Every finding in the review traces to a
diff --git a/plugins/voyage/tests/lib/doc-consistency.test.mjs b/plugins/voyage/tests/lib/doc-consistency.test.mjs
index b704a52..bc96ab4 100644
--- a/plugins/voyage/tests/lib/doc-consistency.test.mjs
+++ b/plugins/voyage/tests/lib/doc-consistency.test.mjs
@@ -585,3 +585,29 @@ test('v5.1 — voyage README.md mentions phase_signals', () => {
   assert.ok(t.includes('phase_signals'),
     'voyage README.md must mention phase_signals (v5.1 "What\'s new" bullet)');
 });
+
+// --- v5.1.1 — High-effort behavior sub-section per command (Step 10) ---
+
+test('v5.1.1 — commands/trekplan.md contains ### High-effort behavior (v5.1.1) sub-section', () => {
+  const t = read('commands/trekplan.md');
+  assert.match(t, /^### High-effort behavior \(v5\.1\.1\)$/m,
+    'trekplan.md must contain ### High-effort behavior (v5.1.1) sub-section under Composition rule (Decision B + gemini-bridge)');
+});
+
+test('v5.1.1 — commands/trekresearch.md contains ### High-effort behavior (v5.1.1) sub-section', () => {
+  const t = read('commands/trekresearch.md');
+  assert.match(t, /^### High-effort behavior \(v5\.1\.1\)$/m,
+    'trekresearch.md must contain ### High-effort behavior (v5.1.1) sub-section under Composition rule (contrarian-researcher + gemini-bridge always-on)');
+});
+
+test('v5.1.1 — commands/trekreview.md contains ### High-effort behavior (v5.1.1) sub-section', () => {
+  const t = read('commands/trekreview.md');
+  assert.match(t, /^### High-effort behavior \(v5\.1\.1\)$/m,
+    'trekreview.md must contain ### High-effort behavior (v5.1.1) sub-section under Composition rule (skip Pass 3 + coordinator normalization)');
+});
+
+test('v5.1.1 — commands/trekexecute.md contains ### High-effort behavior (v5.1.1) sub-section', () => {
+  const t = read('commands/trekexecute.md');
+  assert.match(t, /^### High-effort behavior \(v5\.1\.1\)$/m,
+    'trekexecute.md must contain ### High-effort behavior (v5.1.1) sub-section under Composition rule (gates_mode = closed)');
+});