feat(app-builder): preserve Todo v1 parity

[kattsushi]

Closes #142

Part of #131. Depends on #141. Includes the independently reviewed architectural correction from #145.

Summary

• preserve the independent frozen Todo v1 output contract through atomic generation
• retain compatibility APIs while migrating default ownership to the atomic path
• fail closed on parity, replay, duplicate-path, or surface-ownership drift
• carry forward the declarative-template/generalized-kernel correction reviewed independently in PR refactor(app-builder): use declarative generation templates #145 and merged into this branch

Changes

Area	Change
Atomic generation	Add the Todo v1 atomic compatibility composition and exports.
Compatibility	Route the existing preset through the parity-preserving owner migration.
Frozen contract	Add an independent Todo v1 fixture and exact output assertions.
Architecture	Incorporate the declarative-template/generalized-kernel correction from PR #145.
Tests	Cover default behavior, owner migration, parity drift, and replay compatibility.

Test plan

• Generation tests — 30/30
• CLI tests — 9/9
• Nx tests — 8/8
• Relevant generation, CLI, and Nx typechecks
• Formatting and diff check
• Read-only validator
• Runtime evidence — ordinal/generation 17; sha256:4effd6796f5c25b1227fac670b6a648651aa46a01e956da2d13686b19c001e2c
• RDD/review disabled and unmanaged; receipts not applicable

Contributor checklist

• Linked an approved issue
• Added exactly one type:* label
• Tests included with the behavior
• Conventional commit format
• No Co-Authored-By trailers

Chain Context

Field	Value
Chain	App Builder reusable generation kernel
Tracker issue	#131
Position	Unit 5, with the merged PR #145 architectural correction
Base	feat/app-builder-public-atomic-materialization at 21b92cc56
Current head	2ad43e0cca44a0ed34db27fa29b344a71fc8e214
Accumulated diff	2,195 changed lines (1,692 additions, 503 deletions) across 73 files
Depends on	#141 and #145
Follow-up	Issue #131 Unit 6 public CLI/Nx/E2E proof, then Unit 7 PR #130 eligibility gate
Review boundary	Maintainer-approved separate slices: review #143 original parity migration scope and PR #145 independently, not as one 2,195-line review
Starts at	Public atomic Todo materialization from #141
Ends with	Frozen Todo v1 parity, default compatibility, fail-closed atomic owner migration, and the merged declarative-template/generalized-kernel correction

Chain Overview

#133
 └── #135
      └── #137
           └── #139
                └── #141
                     └── 📍 #143 Unit 5 parity migration
                          ├── #145 architectural correction (independently reviewed, merged)
                          └── Issue #131 Unit 6: public CLI/Nx/E2E proof
                               └── Unit 7: #130 eligibility gate

Review Slices

• PR feat(app-builder): preserve Todo v1 parity #143 original slice: frozen Todo v1 parity, compatibility exports/defaults, atomic owner migration, and focused tests.
• PR refactor(app-builder): use declarative generation templates #145: declarative-template/generalized-kernel architectural correction, independently bounded at 1,994 changed lines, reviewed with all checks passing, and merged into this branch via merge commit 2ad43e0cca44a0ed34db27fa29b344a71fc8e214.
• Maintainer decision: treat these as separately reviewed slices. Do not re-review them as one 2,195-line accumulated diff.

Scope

• Includes: frozen Todo v1 parity, compatibility exports/defaults, atomic owner migration, focused tests, and the merged PR refactor(app-builder): use declarative generation templates #145 architectural correction.
• Excludes: PR feat(app-builder): regenerate canonical Todo showcase #130 changes, issue Deliver reusable App Builder generation kernel #131 Unit 6 public CLI/Nx/E2E proof, the Unit 7 PR feat(app-builder): regenerate canonical Todo showcase #130 eligibility gate, and audit-only commits d0f44d865, fd6e0979e, and 948c673c4.
• PR feat(app-builder): regenerate canonical Todo showcase #130 remains frozen until Unit 6 proof and the Unit 7 eligibility gate pass.

Dependencies

• Immediate base: draft PR feat(app-builder): materialize atomic Todo plans #141 at 21b92cc56.
• Merged architectural dependency: refactor(app-builder): use declarative generation templates #145.
• Tracker: Deliver reusable App Builder generation kernel #131.
• Approved delivery issue: Preserve Todo v1 parity through atomic generation #142.

Next Steps

1. Complete issue Deliver reusable App Builder generation kernel #131 Unit 6 public CLI/Nx/E2E proof.
2. Run Unit 7 as the PR feat(app-builder): regenerate canonical Todo showcase #130 eligibility gate.
3. Keep PR feat(app-builder): regenerate canonical Todo showcase #130 frozen until both gates pass.

Rollback boundary

Revert commit 731cbc165 to remove the original Unit 5 files/edits and restore the #141 public atomic materialization state. PR #145 is a separately reviewed architectural correction merged afterward and must be handled as its own rollback slice. Neither rollback slice includes PR #130, Unit 6, or audit-only commits.

Autonomy

• CI is expected to pass for this PR branch
• This PR has one original deliverable scope plus the separately reviewed PR refactor(app-builder): use declarative generation templates #145 correction
• Each approved review slice has an explicit rollback boundary
• Tests and runtime evidence cover the original Unit 5 slice

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