Preserve Todo v1 parity through atomic generation

[kattsushi]

Requested outcome

Preserve the frozen Todo v1 output contract while migrating default generation and surface ownership to the atomic generation path.

Expected behavior

• Default Todo generation preserves the independent frozen v1 fixture exactly.
• Compatibility APIs keep the existing public preset and topology behavior.
• Atomic generation becomes the default owner without duplicate paths or surface ownership.
• Replay and behavior checks continue to fail closed on parity drift.

Acceptance evidence

• Generation tests: 30/30.
• CLI tests: 9/9.
• Nx tests: 8/8.
• Relevant typechecks, formatting, diff check, and read-only validation pass.
• Runtime evidence: ordinal/generation 17; sha256:4effd6796f5c25b1227fac670b6a648651aa46a01e956da2d13686b19c001e2c.
• RDD/review are disabled and unmanaged; receipts are not applicable.
• Review boundary: 8 files, 398 additions and 2 deletions, 400 changed lines.

Scope

This is Delivery Unit 5 of #131 and depends on public atomic materialization in #140 / draft PR #141. Full isolated public E2E, the PR #130 eligibility gate, PR #130 mutation, and publication of audit-only commits remain out of scope.

[kattsushi]

Closing as not planned because Effectify App Builder has been retired in favor of contributing to lloydrichards/stack-effect. No App Builder implementation is retained on dev.