feat(voyage): wire phase-signal-resolver into 4 downstream commands (closes #9 wiring)

plugins/voyage/commands/trekreview.md

@@ -83,6 +83,11 @@ as the file is parseable:
 
 ```bash
 node ${CLAUDE_PLUGIN_ROOT}/lib/validators/brief-validator.mjs --soft --json "{brief_path}"
+
+# v5.1.1 — resolve the review-phase brief signal. The JSON is captured as
+# phase_signal_result and used in Phase 7 at the reviewer-launch site to
+# inject the brief-resolved model.
+node ${CLAUDE_PLUGIN_ROOT}/lib/profiles/phase-signal-resolver.mjs --brief "{brief_path}" --phase review --json
 ```
 
 Read the JSON output. If `valid: false` AND any error has code
@@ -369,13 +374,19 @@ model_for_phase  = brief.phase_signals[<phase>]?.model  ?? profile.phase_models[
 ```
 
 The brief signal wins per-phase when present; the profile fills any
-gaps. There is no helper module — composition is documented prose in
-each downstream command.
+gaps. Composition is mechanically resolved via
+`node ${CLAUDE_PLUGIN_ROOT}/lib/profiles/phase-signal-resolver.mjs`
+invoked in Phase 2; the resolved JSON is captured as `phase_signal_result`
+and passed to `Agent` tool calls explicitly. The resolver controls only
+the orchestrator and the model parameter at Agent-spawn sites — sub-agents
+otherwise read `model:` from their own `agents/*.md` frontmatter (still
+pinned to `opus`).
 
 For `/trekreview` specifically: `effort == 'low'` activates the existing
 `--quick`-equivalent code-path (skip the brief-conformance reviewer; run
 correctness-only). `effort == 'standard'` (or absent) → no change.
-High-effort behavior is deferred to v5.1.1 per brief Non-Goal.
+`effort == 'high'` activates the high-effort behavior documented under
+`### High-effort behavior (v5.1.1)` below.
 
 ### Sequencing gate surface
 
@@ -407,8 +418,10 @@ readable.
   `findings:\n  - a\n  - b`.
 - **Refuse-with-suggestion above 100 files / 100K tokens.** Never run
   blind on a giant diff. Use AskUserQuestion to surface the gate.
-- **Cost.** Sonnet for all sub-agents (reviewers + coordinator). Opus
-  only runs in the main /trekreview command thread.
+- **Cost.** Sub-agents use their pinned `model:` frontmatter (currently `opus`).
+  When `phase_signals[<phase>].model` is set, the orchestrator AND Agent-spawn
+  sites use the resolved model (`phase_signal_result.model`) for that phase.
+  Frontmatter is the default; brief signal is the per-phase override.
 - **Privacy.** Never log secrets, tokens, or credentials in review.md.
   Findings citing files with secret-like content must redact the secret
   in the `detail` field.