feat: native OpenClaw skills + ClaHub publishing (v0.15.10.0) (#832)

* feat: add 4 native OpenClaw skills for ClaHub publishing

Hand-crafted methodology skills for the OpenClaw wintermute workspace:
- gstack-openclaw-office-hours (375 lines) — 6 forcing questions, startup + builder modes
- gstack-openclaw-ceo-review (193 lines) — 4 scope modes, 18 cognitive patterns
- gstack-openclaw-investigate (136 lines) — Iron Law, 4-phase debugging
- gstack-openclaw-retro (301 lines) — git analytics, per-person praise/growth

Pure methodology, no gstack infrastructure. All frontmatter uses single-line
inline JSON for OpenClaw parser compatibility.

* feat: add AGENTS.md dispatch section with behavioral rules

Ready-to-paste section for OpenClaw AGENTS.md with 3 iron-clad rules:
1. Always spawn sessions, never redirect user to Claude Code
2. Resolve repo path or ask, don't punt
3. Autoplan runs end-to-end, reports back in chat

Includes full dispatch routing (Simple/Medium/Heavy/Full/Plan tiers).

* chore: clear OpenClaw includeSkills — native skills replace generated

Native ClaHub skills replace the gen-skill-docs pipeline output for
these 4 skills. Updated test to validate empty includeSkills array.

* docs: ClaHub install instructions + dispatch routing rules

- README: add Native OpenClaw Skills section with clawhub install command
- OPENCLAW.md: update dispatch routing with behavioral rules, update
  native skills section to reference ClaHub

* chore: bump version and changelog (v0.15.10.0)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: add gstack-upgrade to OpenClaw dispatch routing

Ensures "upgrade gstack" routes to a Claude Code session with
/gstack-upgrade instead of Wintermute trying to handle it conversationally.

* fix: stop tracking 58MB compiled binary bin/gstack-global-discover

Already in .gitignore but was tracked due to historical mistake.
Same issue as browse/dist/ and design/dist/. The .ts source is right
next to it and ./setup builds from source for every platform.

* test: detect compiled binaries and large files tracked by git

Two new tests in skill-validation:
- No Mach-O or ELF binaries tracked (catches accidental git add of compiled output)
- No files over 2MB tracked (catches bloated binaries sneaking in)

Both print the exact git rm --cached command to fix the issue.

* fix: ClaHub → ClawHub (correct spelling)

* docs: add ClawHub publishing instructions to CLAUDE.md

Documents the clawhub publish command (not clawhub skill publish),
auth flow, version bumping, and verification.

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -78,6 +78,24 @@ when Claude Code has gstack installed. Paste this to your OpenClaw agent:
 See [docs/OPENCLAW.md](docs/OPENCLAW.md) for advanced dispatch routing and
 the gstack-lite/gstack-full prompt templates.
 
+### Native OpenClaw Skills (via ClawHub)
+
+Four methodology skills that work directly in your OpenClaw agent, no Claude Code
+session needed. Install from ClawHub:
+
+```
+clawhub install gstack-openclaw-office-hours gstack-openclaw-ceo-review gstack-openclaw-investigate gstack-openclaw-retro
+```
+
+| Skill | What it does |
+|-------|-------------|
+| `gstack-openclaw-office-hours` | Product interrogation with 6 forcing questions |
+| `gstack-openclaw-ceo-review` | Strategic challenge with 4 scope modes |
+| `gstack-openclaw-investigate` | Root cause debugging methodology |
+| `gstack-openclaw-retro` | Weekly engineering retrospective |
+
+These are conversational skills. Your OpenClaw agent runs them directly via chat.
+
 ### Other AI Agents
 
 gstack works on 8 AI coding agents, not just Claude. Setup auto-detects which