docs: refresh App workshop with learner-created skills and QA

[GeekTrainer]

Summary

Final layer 4/4, based on #171 (geektrainer/cli-workshop-pr), of the replacement stack for #167. Mechanically transfers the reviewed App workshop and five translations from pinned revision e150fd531805f57a77be754c37f342386471bc00: setup, star ratings, instructions, filtering, learner-created quality-checks skill, MCP, QA, feature merge, repository-backed canvas, and recap.

Only App directories and eight shared files change: the AUTHORING structure-tree line, App description in six landing pages, and App sidebar. The cumulative tree is exactly 9a355f98d21b9b7a5bd9e0e6b71c691cfd1b36c7, identical to the pinned final snapshot. #167 remains untouched and retains the detailed review and trial history.

Type of change

• Workshop content (lesson Markdown, images)
• Site shell (website/ Astro + Starlight wrapper)
• Copilot configuration (.github/copilot-instructions.md, instructions, agents, skills)
• Repo housekeeping (CI, dependabot, README, license)
• Other:

Verification

• Type checks and a clean site build pass.
• Affected pages and translations match their source and intended routes.
• Offline internal link checks pass.
• Changed external links have been checked separately.

Fresh check:all and build ran from this worktree using the existing matching locked dependencies through a temporary ignored symlink; no installs, and the symlink was removed. Checks report zero errors/warnings and four existing Astro deprecation hints. Offline lychee: zero errors. Source-derived inspection covered 78 affected App/landing routes across six configured languages, their titles/headings, 1,752 paragraphs, and 168 rendered fences; all 24 removed routes are absent. The four frozen English skill/QA prompt hashes match, skill CREATE remains 184 words, and corresponding CLI/App prompts align across locales. All App source bytes and translated fences match the pinned revision. Four added external skill links returned HTTP 200; stale-route and content-alignment sweeps found no remaining drift.

Notes for reviewers

Depends on the lower stack (#169, #170, #171) and external template work github-samples/tailspin-toys#97 and github-samples/tailspin-toys#91; no template changes or merges are included. The raw partition is 104 paths without rename detection (102 with Git's detected renames), all within the authorized scope.

Historical Bash/macOS skill trials with Sonnet and MAI passed lint, unit tests (35 tests/3 files), E2E (28 tests/4 specs), type checks, and the single-file test (12 tests/1 file); see #167 for details. These are not fresh App QA/UI certification. Sonnet recovered from read-only denials, and outer pipeline exit 0 was not native-exit proof; MAI recovered a denied outer eval loop with five direct successful calls, and eval was absent from its generated wrappers. Native PowerShell, the broader QA matrix, App agent-picker/hot discovery, and a full UI rehearsal remain unverified; no new trials or runtime/UI checks were performed here.

Existing rendered callout bodies remain plain divs rather than styled asides, with no raw admonition markers. Renderer, loader, and dependencies are unchanged; that caveat is intentionally not fixed in this mechanical partition. Keep this PR draft; stack registration and disposition of #167 are left to the coordinating session.

[GeekTrainer]

Replacement App review: #174, directly above #169. Current native stack review order is #169 → #174 → #170 → #171.

GitHub indirectly marked this PR merged when its then-current CLI base acquired the App commit during reordering. Nothing merged into main. This closed PR and its original stack remain preserved as history; use #174 for ongoing App review. The final reordered stack tree exactly matches the preserved complete revision.