v2.0.1 — Post-launch polish

Post-launch polish release. Fixes issues found after v2.0.0 shipped, adds brand asset, corrects terminology leftovers.

Fixed

• README Mermaid diagram truncation — Long node labels in the architecture diagram were truncated on GitHub's rendered view. Fixed by wrapping labels with <br/> in quoted syntax. Verified via Chrome browser automation on live GitHub render. (#4a37c00)
• /tour skill obsolete content — The tour still referenced v1 architecture (3 hooks, topics/ layer). Now reflects v2: 5 hooks, knowledge/ wiki layer, new Step 5 for Memory Kit v2 Scripts. (#6da1f19)
• Terminology leftovers: topics/ → knowledge/ — Systematic audit caught 4 lingering v1 references in MEMORY.md template and CLAUDE.md. All migrated to knowledge/concepts/ naming. (#ab1b0b5)
• Missing CONTRIBUTING.md — README linked to CONTRIBUTING.md that didn't exist (broken link). Created minimal guide with PR rules and ground rules (zero dependencies, pure Markdown, Obsidian optional). (#ab1b0b5)

Added

• GitHub Social Preview banner — `.github/assets/og-banner.png` (1280×640). Dark editorial design with isometric 5-layer glass stack (BRAIN/MEMORY/RULES/JOURNAL/CONTEXT). Generated via Gemini Nano Banana Pro. Upload via repo Settings → Social preview. (#29afd04, #b9cd78e)
• Hero banner in README — Banner now renders as the first element of README via pure Markdown. Stays compliant with H3 Hybrid structure (no HTML wrappers in top zone). (#de0990b)

Upgrading from v2.0.0

No breaking changes. Pure additive + fixes.

If you already cloned v2.0.0:
```bash
git pull origin main
```

• The `/tour` skill will show the updated v2 walkthrough automatically on next invocation
• The Mermaid diagram fix only affects rendered view; no behavior change
• No migration steps needed

Full changelog

See CHANGELOG.md for complete details.

Full diff: v2.0.0...v2.0.1