feat: tableau-release-html skill + Loader v0.6.0 release page

[wenchy]

Summary

• Adds the tableau-release-html skill that generates self-contained, light-theme HTML release pages for Tableau-family GitHub releases (Inter + JetBrains Mono, Tailwind CDN, sticky pill nav, animated hero, semantic-color sections, GitHub-light code blocks, scroll-reveal animations).
• Adds the first generated artifact: Loader v0.6.0 at static/release/loader-v0-6-0.html, with parallel en + zh markdown stubs in content/{en,zh}/release/ so it shows up as a card on the existing /release/ list.
• Documents the release-page authoring flow in CLAUDE.md.
• Two small dev-server / dev-loop fixes from working with the skill:
  • npm run start: drop --poll 700ms (back to fsnotify) — cleaner Ctrl-C, lower idle CPU. Keeps --forceSyncStatic --navigateToChanged.
  • Code-block CSS: switch .code-blk-bd / .demo-out-bd bodies to <pre><code> with literal newlines and per-block overflow-x: auto so long lines scroll instead of wrapping or forcing the card wider. Encoded the rule in the skill so future pages start correct.

Highlights

• Skill content lives under .claude/skills/tableau-release-html/ (gitignored — local only). Includes SKILL.md (the workflow), references/design-system.md (the verbatim CSS block + colour matrix), and an evals/ folder.
• The Loader v0.6.0 page is grounded in a deep walkthrough of the tableauio/loader repo at the v0.5.0..v0.6.0 commit range — see commit 8ccffcdb for specifics: real MapDepth / LeveledContainerDepth story for the index fix (#158); exact oneof skip patch (#156); dual-mode TABLEAU_PB_LOG_LEGACY log handler (#155); Lesser[T Lesser[T]] self-refer generics with //go:build go1.26 (#148); vcpkg + make.py build pipeline replacing init.bat / init.sh / prepare.bat (#161, #162); precise toolchain pins from .devcontainer/versions.env.
• Section title colours now match their tag accent across the page (green / blue / red / amber / slate / violet).

Test plan

• npm run lint passes (scripts + styles + markdown).
• npm run start brings up Hugo cleanly and Ctrl-C terminates without leaving an orphan hugo.exe.
• /release/ list shows the existing v0.16.0 / v0.15.0 entries plus the new Loader v0.6.0 card with the HTML badge.
• /release/loader-v0-6-0/ renders the iframe page (full-width, breadcrumb + open-in-tab + fullscreen toolbar, no left sidebar, no lead text).
• Inside the iframe at /release/loader-v0-6-0.html: every code block scrolls horizontally on long lines without re-wrapping or widening the card; sections use the colour-matched titles.
• Clicking the Tableau brand inside the iframe artifact navigates the parent window to / (target="_top").

🤖 Generated with Claude Code