chore(cleanup): R-b R3 — profiles, phase signals and the effort dialog removed, one fixed path per command

The four profiles, the resolver, the profile validator and docs/profiles.md go;
/trekbrief Phase 3.5 and the brief's phase_signals checks go (an older brief's
key is ignored); MANIFEST_PROFILE_DRIFT and profile_used go. Every Profile,
Composition rule, Sequencing gate and High-effort section leaves the commands.
Decision 209: /trekresearch runs the full swarm with contrarian-researcher as
wave 2 every run; /trekreview and the coordinator run all four passes with no
high-effort normalization. Voyage agents are spawned with no model (their own
model: opus applies); the two built-in spawns pass model "opus". --profile
stays in the parser as a retired flag that swallows its value. §Model & effort
moves to docs/architecture.md; the sequencing-gate eval case goes.

Files removed: 44 (43 from the R3 list + tests/commands/trekreview.test.mjs,
whose every test pinned removed text). Files edited: 43.
Tests: 2467 (2466 pass / 0 fail / 1 skipped) before, 2309 (2309 pass / 0 fail /
0 skipped) after. Durable check: all three groups green, none pending.

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

tests/validators/brief-gate-coverage.test.mjs

@@ -69,7 +69,6 @@ auto_research: false
 interview_turns: 5
 source: interview
 framing: new-direction
-phase_signals_partial: true
 ---
 
 # Task: JWT auth
@@ -116,28 +115,7 @@ Find what was missed.
 - All BLOCKER findings get a fix-plan.
 `;
 
-// signals blocks
-const GOOD_SIGNALS = `phase_signals:
-  - phase: plan
-    effort: high
-    model: opus
-`;
-const BAD_PHASE_SIGNALS = `phase_signals:
-  - phase: nonsense
-    effort: high
-`;
-const BAD_EFFORT_SIGNALS = `phase_signals:
-  - phase: plan
-    effort: turbo
-`;
-const BAD_MODEL_SIGNALS = `phase_signals:
-  - phase: plan
-    effort: high
-    model: gpt4
-`;
-
 // convenience builders
-const v21 = (s) => s.replace('brief_version: "2.0"', 'brief_version: "2.1"');
 const withLine = (s, line) => s.replace('source: interview\n', `source: interview\n${line}`);
 
 // ---- the canonical in-scope set + a class-balanced pair for each -------------
@@ -151,12 +129,6 @@ const IN_SCOPE_CODES = [
   'BRIEF_MISSING_SECTION',
   'BRIEF_INVALID_FRAMING',
   'BRIEF_MISSING_FRAMING',
-  'BRIEF_V51_MISSING_SIGNALS',
-  'BRIEF_SIGNALS_MUTUALLY_EXCLUSIVE',
-  'BRIEF_INVALID_PHASE_SIGNALS',
-  'BRIEF_INVALID_PHASE_SIGNAL_PHASE',
-  'BRIEF_INVALID_EFFORT',
-  'BRIEF_INVALID_MODEL',
 ];
 
 const CASES = {
@@ -192,30 +164,6 @@ const CASES = {
     fail: GOOD_BRIEF_22.replace('framing: new-direction\n', ''),
     pass: GOOD_BRIEF_22,
   },
-  BRIEF_V51_MISSING_SIGNALS: {
-    fail: v21(GOOD_BRIEF),
-    pass: GOOD_BRIEF, // 2.0 — gate inactive
-  },
-  BRIEF_SIGNALS_MUTUALLY_EXCLUSIVE: {
-    fail: withLine(v21(GOOD_BRIEF), `phase_signals_partial: true\n${GOOD_SIGNALS}`),
-    pass: withLine(v21(GOOD_BRIEF), 'phase_signals_partial: true\n'),
-  },
-  BRIEF_INVALID_PHASE_SIGNALS: {
-    fail: withLine(GOOD_BRIEF, 'phase_signals: notalist\n'),
-    pass: withLine(v21(GOOD_BRIEF), GOOD_SIGNALS),
-  },
-  BRIEF_INVALID_PHASE_SIGNAL_PHASE: {
-    fail: withLine(v21(GOOD_BRIEF), BAD_PHASE_SIGNALS),
-    pass: withLine(v21(GOOD_BRIEF), GOOD_SIGNALS),
-  },
-  BRIEF_INVALID_EFFORT: {
-    fail: withLine(v21(GOOD_BRIEF), BAD_EFFORT_SIGNALS),
-    pass: withLine(v21(GOOD_BRIEF), GOOD_SIGNALS),
-  },
-  BRIEF_INVALID_MODEL: {
-    fail: withLine(v21(GOOD_BRIEF), BAD_MODEL_SIGNALS),
-    pass: withLine(v21(GOOD_BRIEF), GOOD_SIGNALS),
-  },
 };
 
 test('gate coverage — CASES keys exactly match IN_SCOPE_CODES (no silent gap)', () => {