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

plugins/voyage/commands/trekplan.md

@@ -66,6 +66,11 @@ Parse `$ARGUMENTS` for mode flags. Order of precedence:
      # Brief schema sanity check (frontmatter + state machine, soft on body sections)
      node ${CLAUDE_PLUGIN_ROOT}/lib/validators/brief-validator.mjs --soft --json "{dir}/brief.md"
 
+     # v5.1.1 — resolve per-phase brief-signal for plan phase. Result is
+     # captured as phase_signal_result and used at Agent-spawn sites below
+     # to override the orchestrator model when a signal is present.
+     node ${CLAUDE_PLUGIN_ROOT}/lib/profiles/phase-signal-resolver.mjs --brief "{dir}/brief.md" --phase plan --json
+
      # Research briefs (if any) — drift-warn only, none of these block the run
      [ -d "{dir}/research" ] && \
        node ${CLAUDE_PLUGIN_ROOT}/lib/validators/research-validator.mjs --soft --dir "{dir}/research" --json
@@ -906,14 +911,19 @@ 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 1; 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 `/trekplan` specifically: `effort == 'low'` activates the existing
 `--quick`-equivalent code-path (skip Phase 5 agent swarm — plan directly
 without exploration agents). `effort == 'standard'` (or absent) → no
-change. High-effort behavior is deferred to v5.1.1 per brief Non-Goal
-("No complete per-phase effort dictionary").
+change. `effort == 'high'` activates the high-effort behavior documented
+under `### High-effort behavior (v5.1.1)` below.
 
 ### Sequencing gate surface
 
@@ -933,8 +943,10 @@ validator-only; this surface just makes the friendly hint readable.
   inadequate, stop and ask the user to run `/trekbrief` again.
 - **Scope**: Only explore the current working directory and its subdirectories.
   Never read files outside the repo (no ~/.env, no credentials, no other repos).
-- **Cost**: Sonnet for all agents (exploration, deep-dives, research, critics).
-  Opus only runs in the main thread for synthesis and planning.
+- **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, store, or repeat file contents that look like
   secrets, tokens, or credentials. Never log prompt text.
 - **No premature execution**: Do not modify any project files until the user