fix(#2072): thread resolved model into routed-agent spawns (assumptions-analyzer, code-reviewer, code-fixer)

model_overrides / models.<phaseType> were silently inert for gsd-assumptions-analyzer,
gsd-code-reviewer, and gsd-code-fixer on Claude Code: resolveModelInternal honors them,
but the workflows spawned these agents with no model= param, so the resolved value
never reached the Agent tool and the agents inherited the session model — no warning.

Fix — thread each agent's resolved model at every spawn site (the established
plan-phase pattern; the architecture-consistent Claude mechanism, since 13 other
agents already thread their model):
- discuss-phase-assumptions.md: `resolve-model gsd-assumptions-analyzer --raw`
  → ANALYZER_MODEL, threaded.
- code-review.md + code-review-fix.md (re-review): `resolve-model gsd-code-reviewer --raw`
  → REVIEWER_MODEL, threaded.
- code-review-fix.md (both fixer spawns): `resolve-model gsd-code-fixer --raw`
  → FIXER_MODEL, threaded (same silently-inert bug, same file — folded in per review).
- quick.md review step: was reusing `{executor_model}` for gsd-code-reviewer (so the
  reviewer's own override was ignored); init.quick now resolves `reviewer_model`
  (gsd-code-reviewer) and the spawn threads it.

resolve-model --raw returns the bare model string (resolve-execution --raw would
return effort — wrong). The resolver maps these agents to phaseType discuss /
verification / execution, so models.<phaseType> apply too.

Scope: the three agents reachable from the two issue-named workflows + quick.md. The
wider systemic class (other agents in UNTOUCHED workflows with the same pattern) stays
documented on the issue for a maintainer-scoped structural decision (thread-at-source
vs embed-at-install like #2256), not widened here.

Docs: the stale "discuss — reserved, no subagent today" model-profile tables now list
gsd-assumptions-analyzer and the verification row includes gsd-code-reviewer, across
the English docs, the shipped gsd-core/references/model-profiles.md reference, and the
ja-JP / zh-CN / ko-KR / pt-BR locale mirrors.

Tests:
- tests/model-resolver.test.cjs: #2072 acceptance — model_overrides and
  models.discuss/verification/execution resolve for all three agents.
- tests/model-routing-spawn-threading.test.cjs: every spawn of the three agents threads
  a resolved model (fails pre-fix); a header-precise parity guard fails the suite if a
  new un-threaded spawn of any of them regresses.
All 16 golden-install-parity fixtures + the workflow size baseline regenerated for the
changed shipped files (4 workflows + the reference doc); bin/lib is excluded from parity.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/ja-JP/FEATURES.md

@@ -2676,10 +2676,10 @@ capture_thought({
 | スロット | 割り当てられたエージェント |
 |---------|----------------------|
 | `planning` | `gsd-planner`、`gsd-roadmapper`、`gsd-pattern-mapper` |
-| `discuss` | （将来のサブエージェント用に予約） |
+| `discuss` | `gsd-assumptions-analyzer` |
 | `research` | `gsd-phase-researcher`、`gsd-project-researcher`、`gsd-research-synthesizer`、`gsd-codebase-mapper`、`gsd-ui-researcher` |
 | `execution` | `gsd-executor`、`gsd-debugger`、`gsd-doc-writer` |
-| `verification` | `gsd-verifier`、`gsd-plan-checker`、`gsd-integration-checker`、`gsd-nyquist-auditor`、`gsd-ui-checker`、`gsd-ui-auditor`、`gsd-doc-verifier` |
+| `verification` | `gsd-verifier`、`gsd-plan-checker`、`gsd-integration-checker`、`gsd-nyquist-auditor`、`gsd-ui-checker`、`gsd-ui-auditor`、`gsd-doc-verifier`、`gsd-code-reviewer` |
 | `completion` | （将来のサブエージェント用に予約） |
 
 **受け入れられる値:** `"opus"` / `"sonnet"` / `"haiku"` / `"inherit"`

docs/ja-JP/how-to/configure-model-profiles.md

@@ -88,8 +88,9 @@ npx @opengsd/gsd-core@latest --codex --global   # または --opencode、--kilo
 | `planning` | `gsd-planner`、`gsd-roadmapper`、`gsd-pattern-mapper` |
 | `research` | `gsd-phase-researcher`、`gsd-project-researcher`、`gsd-research-synthesizer`、`gsd-codebase-mapper`、`gsd-ui-researcher` |
 | `execution` | `gsd-executor`、`gsd-debugger`、`gsd-doc-writer` |
-| `verification` | `gsd-verifier`、`gsd-plan-checker`、`gsd-integration-checker`、`gsd-nyquist-auditor`、`gsd-ui-checker`、`gsd-ui-auditor`、`gsd-doc-verifier` |
-| `discuss`、`completion` | 予約済み — 現在はサブエージェントなし。スキーマの前方互換性のために受け入れられます |
+| `verification` | `gsd-verifier`、`gsd-plan-checker`、`gsd-integration-checker`、`gsd-nyquist-auditor`、`gsd-ui-checker`、`gsd-ui-auditor`、`gsd-doc-verifier`、`gsd-code-reviewer` |
+| `discuss` | `gsd-assumptions-analyzer` |
+| `completion` | 予約済み — 現在はサブエージェントなし。スキーマの前方互換性のために受け入れられます |
 
 `models` ブロックはティアエイリアス（`opus`、`sonnet`、`haiku`、`inherit`）のみを受け入れます。特定のエージェントに完全修飾のモデル ID を指定するには `model_overrides` を使用してください。