docs: OpenClaw architecture doc + regenerate all SKILL.md with spawned session detection

Add docs/OPENCLAW.md with 4-tier dispatch routing and integration architecture.
Generate gstack-lite and gstack-full prompt templates. Regenerate all SKILL.md
files with OPENCLAW_SESSION env var check in preamble.

openclaw/gstack-full-CLAUDE.md

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+# gstack-full Pipeline
+
+Injected by Wintermute for complete feature builds. Append to existing CLAUDE.md.
+
+## Full Pipeline
+1. Read CLAUDE.md and understand the project context.
+2. Run /autoplan to review your approach (CEO + eng + design review pipeline).
+3. Implement the approved plan. Follow the planning discipline above.
+4. Run /ship to create a PR with tests, changelog, and version bump.
+5. Report back: PR URL, what shipped, decisions made, anything uncertain.
+
+Do not ask for human input until the PR is ready for review.

openclaw/gstack-lite-CLAUDE.md

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+# gstack-lite Planning Discipline
+
+Injected by Wintermute into spawned Claude Code sessions. Append to existing CLAUDE.md.
+
+## Planning Discipline
+1. Read every file you will modify. Understand existing patterns first.
+2. Before writing code, state your plan: what, why, which files, test case, risk.
+3. When ambiguous, prefer: completeness over shortcuts, existing patterns over new ones,
+   reversible choices over irreversible ones, safe defaults over clever ones.
+4. Self-review your changes before reporting done. Check for: missed files, broken
+   imports, untested paths, style inconsistencies.
+5. Report when done: what shipped, what decisions you made, anything uncertain.