Add gate intensity modes: full, lean, and solo review control

Adds a --review flag to all 13 gate-using skills and a global
production/review-mode.txt config (set during /start). Full runs all
director gates, lean skips per-skill gates but keeps phase gates, solo
skips all directors. Documents modes in director-gates.md, WORKFLOW-GUIDE.md,
and README.md.

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

.claude/skills/playtest-report/SKILL.md

@@ -1,13 +1,16 @@
 ---
 name: playtest-report
 description: "Generates a structured playtest report template or analyzes existing playtest notes into a structured format. Use this to standardize playtest feedback collection and analysis."
-argument-hint: "[new|analyze path-to-notes]"
+argument-hint: "[new|analyze path-to-notes] [--review full|lean|solo]"
 user-invocable: true
 allowed-tools: Read, Glob, Grep, Write
 ---
 
 ## Phase 1: Parse Arguments
 
+Extract `--review [full|lean|solo]` if present and store as the review mode
+override for this run (see `.claude/docs/director-gates.md`).
+
 Determine the mode:
 
 - `new` → generate a blank playtest report template