feat(app-builder): regenerate canonical Todo showcase

[kattsushi]

Closes #127
Part of #131

Summary

• Regenerates the canonical Todo showcase from the current PR feat(app-builder): expose public generate command #129 head through the installed public effectify-app-builder generate --events=jsonl command.
• Commits and verifies the exact 18-output standalone workspace, including immutable provenance, zero-write replay, and installed-public drift detection.
• Updates CI, root discovery exclusions, acceptance evidence, and authority tests for the canonical showcase contract.

PR Type

• Bug fix
• New feature
• Documentation only
• Code refactoring
• Maintenance/tooling
• Breaking change

Chain Context

• Strategy: feature-branch-chain.
• Chain: #129 → 📍 #130 → #126.
• Starts from: PR feat(app-builder): expose public generate command #129 head 85cc877ab8ed960f84a174304b0e12c7477878c6 on feat/app-builder-golden-generate-command.
• Current work unit: canonical Todo showcase regeneration and closure evidence.
• Follow-up: review and CI remain pending. This draft does not claim merge approval.
• Out of scope: merging, marking ready, or changing PR feat(app-builder): expose public generate command #129 or PR feat(app-builder): add nested E2E harness #126.

Canonical Generation Proof

• The eligibility gate accepted all six Unit 1 through Unit 6 evidence identities and returned { "prNumber": 130, "status": "eligible" } against the frozen PR feat(app-builder): regenerate canonical Todo showcase #130 authority.
• Generation packed the contracts, generation, and CLI packages, installed them through an isolated registry, and invoked only the installed public CLI binary.
• The generated workspace contains exactly four Nx projects: @effectify/todo-domain, @effectify/todo-application, @effectify/todo-infrastructure, and @effectify/todo-cli.
• All four generated projects passed build, typecheck, and test. The runtime scenario emitted add, complete, and remove events and ended with an empty Todo state.
• The replay wrote zero paths and preserved all 18 byte and mode identities.
• Cleanup stopped the Nx daemon, released the registry port, and removed the isolated store and workspace.
• tools/check-app-builder-showcase.mjs reproduces the installed-public generation path and checks every output path, digest, mode, and zero-write replay.

19 → 18 Migration

• Replaces the previous 19-output fixture with the canonical 18-output installed-public result.
• Removes six obsolete per-output .effectify/generation receipts.
• Adds the five canonical workspace root files: nx.json, package.json, pnpm-workspace.yaml, tsconfig.build.json, and vitest.config.mts.
• Uses workspace package-name imports and dependency manifests instead of cross-project relative source imports.

Changes

File / area	Change
examples/app-builder-todo/**	Canonical 18-output Todo workspace, provenance receipt, and regeneration guide
tools/check-app-builder-showcase.mjs	Installed-public regeneration, identity comparison, replay, and cleanup drift authority
packages/app-builder/cli/tests/showcase.test.ts	Freezes all 18 identities and proves root workspace exclusions
.github/workflows/ci.yml	Adds the recurring installed-public showcase drift job
.nxignore, .oxfmtrc.json, nx.json, pnpm-workspace.yaml	Keeps the standalone fixture out of root discovery and formatter mutation
openspec/changes/app-builder-golden-monorepo/tasks.md	Records completion of the approved showcase acceptance work

Size Exception

The maintainer explicitly approved size:exception for this atomic regeneration unit.

Classification	Files	Additions	Deletions	Policy treatment
Canonical generated goldens	18	387	0	Excluded from authored budget
Fixture provenance and README	2	195	0	Authored
CI, drift checker, tests, config, and acceptance evidence	8	330	5	Authored
Policy-authored total	10	525	5	530 changed lines, approved exception
Full candidate	28	912	5	917 changed lines total

The independent validation passed every technical identity, gate, generation, runtime, drift, format, sync, lockfile, and state-integrity check. Its prior FAIL verdict was solely the then-unapproved 530-line authored budget. The explicit maintainer exception resolves that publication blocker.

Test Plan

• Eligibility gate returned eligible with complete Unit 1 through Unit 6 evidence.
• Installed-public generation produced exactly 18 outputs and the exact four-project graph.
• Generated workspace build, typecheck, test, and runtime scenario passed.
• Zero-write replay preserved every generated byte and mode.
• Installed-public drift checker passed all 18 identities; deliberate drift exited 1 without rewriting the fixture.
• Affected App Builder build, typecheck, test, and lint validation passed; tests covered 275 cases.
• Installed-public E2E passed 4 of 4 lifecycle scenarios.
• Format, Nx sync, frozen lockfile, full candidate diff, and cleanup checks passed.
• No shell scripts changed; ShellCheck is not applicable.

Regenerated Identity

• Frozen previous PR feat(app-builder): regenerate canonical Todo showcase #130 head: d5928f99a122b04cb70ff68bfa02fa2d5648a5fc.
• Regenerated base: 85cc877ab8ed960f84a174304b0e12c7477878c6.
• Regenerated commit: d6a26b807b4801dabcb9bd29829affa65c9bb2ff.
• Candidate tree: 200981243c41405aaf6c95c7b2dd88ec436f71a7.
• Full-index binary diff SHA-256: 1e3dd84154ccc99201b26cf754cfc68469f354114649dd8718fb2b1449dbbc45.

Rollback

If regeneration must be reverted, restore the frozen head only while the regenerated head is still current:

git push origin d5928f99a122b04cb70ff68bfa02fa2d5648a5fc:refs/heads/feat/app-builder-golden-showcase \
  --force-with-lease=feat/app-builder-golden-showcase:d6a26b807b4801dabcb9bd29829affa65c9bb2ff

Contributor Checklist

• Linked approved issue Deliver App Builder Golden showcase and closure slice #127 and retained Part of #131 context.
• Retained exactly one type:feature label.
• Recorded the approved size:exception and complete generated/authored breakdown.
• Included the installed-public generator, runtime, replay, drift, and cleanup evidence.
• Used a Conventional Commit message.
• Included no Co-Authored-By or AI attribution.

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