fix(commands): wire profile phase_models into spawn-site model resolution

commands/trekplan.md

@@ -75,10 +75,11 @@ Parse `$ARGUMENTS` for mode flags. Order of precedence:
      # older brief that sidesteps framing enforcement.
      node ${CLAUDE_PLUGIN_ROOT}/lib/validators/brief-validator.mjs --soft --json [--min-version {min_brief_version}] "{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
+     # v5.9 — composed phase-model resolution (brief > profile > default) for
+     # the plan phase. ONE call returns {effort, model, source}; captured as
+     # phase_signal_result and injected at Agent-spawn sites below.
+     # Append --profile {profile} when the operator passed --profile.
+     node ${CLAUDE_PLUGIN_ROOT}/lib/profiles/resolver.mjs --resolve-phase-model --phase plan --brief-path "{dir}/brief.md" [--profile {profile}] --json
 
      # Research briefs (if any) — drift-warn only, none of these block the run
      [ -d "{dir}/research" ] && \
@@ -824,7 +825,7 @@ Never let tracking failures block the main workflow.
 
 ## Profile (v4.1)
 
-Accepts `--profile <name>` where `<name>` is `economy`, `balanced`, `premium`,
+Accepts `--profile <name>` where `<name>` is `economy`, `balanced`, `premium`, `fable`,
 or a custom profile under `voyage-profiles/`. Default: `premium`.
 
 Resolution order (per `lib/profiles/resolver.mjs`):
@@ -859,13 +860,15 @@ model_for_phase  = brief.phase_signals[<phase>]?.model  ?? profile.phase_models[
 ```
 
 The brief signal wins per-phase when present; the profile fills any
-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`).
+gaps. Both fields are mechanically resolved by the single composed CLI
+`node ${CLAUDE_PLUGIN_ROOT}/lib/profiles/resolver.mjs --resolve-phase-model`
+invoked in Phase 1; the resolved JSON `{effort, model, source}` is captured
+as `phase_signal_result` and passed to `Agent` tool calls explicitly. The
+resolver controls the `model` parameter at Agent-spawn sites only — the
+orchestrator's own model is fixed at invocation time (command frontmatter
+omits `model:`, so it follows the session model) and cannot be switched
+mid-turn. Sub-agents fall back to `model:` in their own `agents/*.md`
+frontmatter when no spawn-site injection happens.
 
 For `/trekplan` specifically: `effort == 'low'` activates the existing
 `--quick`-equivalent code-path (skip Phase 5 agent swarm — plan directly
@@ -910,10 +913,11 @@ Standard and low effort: do NOT run the additional pass.
   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**: 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.
+- **Cost**: Model resolution at Agent-spawn sites is a three-layer fallback:
+  brief `phase_signals[<phase>].model` > `profile.phase_models[<phase>]` >
+  agent frontmatter `model:`. The composed resolver returns the first two
+  layers as `phase_signal_result.model`; spawn sites inject it, and agent
+  frontmatter is the fallback when no injection happens.
 - **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