Model routing, PostCompact hook, parallel spawning, error recovery

Model tier assignment:
- model: haiku → help, sprint-status, story-readiness, scope-check,
  project-stage-detect, changelog, patch-notes, onboard (read-only/format)
- model: opus → review-all-gdds, architecture-review, gate-check
  (multi-doc synthesis, high-stakes verdicts)

PostCompact hook:
- New .claude/hooks/post-compact.sh — fires after compaction, reminds
  Claude to re-read production/session-state/active.md to restore context
- Registered in settings.json between PreCompact and Stop

Parallel Task spawning:
- review-all-gdds: Phase 2 (consistency) and Phase 3 (design theory) now
  explicitly instructed to spawn as parallel Task agents simultaneously

Error Recovery Protocol:
- Standard BLOCKED-handling section added to: review-all-gdds,
  architecture-review, dev-story, team-combat, team-qa, team-narrative,
  team-level, team-ui, team-audio, team-release, team-polish
- Pattern: surface blocker → assess dependencies → offer 3 options via
  AskUserQuestion → always produce partial report

Coordination rules:
- Added Model Tier Assignment table with routing rationale
- Added Subagents vs Agent Teams section (experimental agent teams docs)
- Added Parallel Task Protocol (when/how to spawn parallel agents)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/skills/review-all-gdds/SKILL.md

@@ -6,6 +6,7 @@ user-invocable: true
 allowed-tools: Read, Glob, Grep, Write, Bash
 context: fork
 agent: game-designer
+model: opus
 ---
 
 # Review All GDDs
@@ -81,6 +82,15 @@ If fewer than 2 system GDDs exist, stop:
 
 ---
 
+### Parallel Execution
+
+Phase 2 (Consistency) and Phase 3 (Design Theory) are independent — they read
+the same GDD inputs but produce separate reports. Spawn both as parallel Task
+agents simultaneously rather than waiting for Phase 2 to complete before
+starting Phase 3. Collect both results before writing the combined report.
+
+---
+
 ## Phase 2: Cross-GDD Consistency
 
 Work through every pair and group of GDDs to find contradictions and gaps.
@@ -568,6 +578,20 @@ verdict from this review before architecture work can begin.
 
 ---
 
+## Error Recovery Protocol
+
+If any spawned agent returns BLOCKED, errors, or fails to complete:
+
+1. **Surface immediately**: Report "[AgentName]: BLOCKED — [reason]" before continuing
+2. **Assess dependencies**: If the blocked agent's output is required by a later phase, do not proceed past that phase without user input
+3. **Offer options** via AskUserQuestion with three choices:
+   - Skip this agent and note the gap in the final report
+   - Retry with narrower scope (fewer GDDs, single-system focus)
+   - Stop here and resolve the blocker first
+4. **Always produce a partial report** — output whatever was completed so work is not lost
+
+---
+
 ## Collaborative Protocol
 
 1. **Read silently** — load all GDDs before presenting anything