fix: address all 13 CodeRabbit comments from second review pass

Duplicate /gsd-help rows (caused by join-discord → help replacement
landing in tables that already had /gsd-help):
- Remove Discord-purpose duplicate row from README.md, README.ja-JP.md,
  README.zh-CN.md, README.ko-KR.md, docs/zh-CN/README.md,
  docs/zh-CN/USER-GUIDE.md, docs/ja-JP/USER-GUIDE.md,
  docs/ko-KR/USER-GUIDE.md
- Remove orphaned Discord-only ### /gsd-help sections from
  docs/ja-JP/COMMANDS.md and docs/ko-KR/COMMANDS.md

Gap-fix command precision (plan-milestone-gaps → audit-milestone --fix):
- README.ja-JP.md, README.ko-KR.md, README.zh-CN.md gap-fix rows
  updated to /gsd-audit-milestone --fix

docs/COMMANDS.md: document --path <dir> for --from-gsd2 in table and
  example block

docs/FEATURES.md:
- Add adaptive to /gsd-config --profile value set
- Add blank line before spike Produces table (MD058)

Suite: 6971/6971 pass

docs/FEATURES.md

@@ -748,7 +748,7 @@
 
 ### 26. Model Profiles
 
-**Command:** `/gsd-config --profile <quality|balanced|budget|inherit>`
+**Command:** `/gsd-config --profile <quality|balanced|budget|adaptive|inherit>`
 
 **Purpose:** Control which AI model each agent uses, balancing quality vs cost.
 
@@ -2542,6 +2542,7 @@ Users who run a memory / knowledge-base MCP server (for example, ExoCortex-style
 - REQ-SPIKE-06: `/gsd-spike --wrap-up` MUST package findings into `.claude/skills/spike-findings-[project]/`
 
 **Produces:**
+
 | Artifact | Description |
 |----------|-------------|
 | `.planning/spikes/NNN-name/README.md` | Hypothesis, experiment code, verdict, and evidence |