docs(harness): document workflow gates

[egdev6]

Summary

Document the harness gates added for linked issues, Storybook stories, and paired bilingual docs.

Closes #261

Review scope

• Primary files/areas:
  • .atl/skills/* harness rules for issue START WORK, PR readiness, component/spec flow, worktree flow, Storybook stories, component audit, and bilingual docs review.
  • .atl/AGENTS.md and contributor docs language rule.
  • .github/ISSUE_TEMPLATE/*.yml and .github/PULL_REQUEST_TEMPLATE.md workflow checklists.
  • Contributor docs and README/quick-start/environment setup docs.
  • docs/COMPONENTS.md restored as the Spanish pair for docs/COMPONENTS.en.md.
• Out of scope:
  • Component runtime behavior.
  • Existing local/unrelated .gitignore, .atl/skill-registry.md, reviews/, and sdd-init-result.md changes.
• Review workload: medium; docs-only harness alignment across duplicated contributor surfaces.

Type of change

• New component
• Existing component update/refactor
• Bug fix
• Accessibility
• Design tokens
• Storybook/docs
• Infrastructure/tooling
• NPM/dependencies

Workflow gates

• Linked issue is present with Closes #NNN or maintainer approved an exception.
• Linked issue has label status:approved before implementation starts.
• Linked issue assignee was checked before work started; issue was unassigned, then assigned to @egdev6.
• Work was started through the Project flow: assignee set, Project status In progress, branch/worktree recorded.
• PR title follows Conventional Commit format: <type>(<optional scope>): <description>.
• Commits follow the same commitlint-enforced format.
• Diff is focused; unrelated work is called out in Review scope.
• MCP/runtime artifacts are absent: .playwright-mcp, page-*.png, page-*.jpeg, *.md.playwright-output.

Component evidence (required for component changes)

N/A — docs/harness-only change.

Accessibility evidence

N/A — docs/harness-only change.

Validation evidence

• TypeScript: lefthook pre-commit ran typecheck during both commits — passed.
• Unit tests: lefthook pre-push ran pnpm test — 32 files / 608 tests passed after each push.
• Build/package: not run locally; docs/harness-only change.
• Storybook or visual check: not run locally; no component visuals changed.
• Accessibility check: not run locally; no runtime accessibility changed.
• Security/dependency check: not run locally; no dependency changes.
• Diff hygiene: git diff --check passed.
• Bilingual docs check: docs/COMPONENTS.md is Spanish; fenced code blocks match docs/COMPONENTS.en.md exactly (95/95).
• Review: fresh reviewer confirmed prior blockers resolved and bilingual-doc follow-up has no blockers.

Screenshots or recordings

N/A — docs/harness-only change.

Notes for reviewer

This PR codifies three harness rules:

1. Linked issue guard: before actions from a linked issue, verify assignees; if assigned to someone else, stop and require explicit permission before reassignment/takeover.
2. Storybook story guard: avoid redundant stories, use Storybook's global dark-mode toolbar for normal theme coverage, and require useful per-story JSDoc explaining the scenario and why it matters.
3. Bilingual docs guard: paired root/docs files keep Spanish in base *.md and English in matching .en.md; Storybook/code/comments/identifiers remain English.

[egdev6]

Superseded by #264. This PR was created while recovering the branch after #262 merged and still shows the broad pre-merge diff; #264 contains the focused bilingual-docs follow-up only.

[egdev6]

Closing in favor of focused follow-up #264.