Add intentional settings cutover cancellation

[lynnswap]

Purpose

Separate intentional runtime cutover cancellation from failure abort so superseded runtime work does not leave a false settings error.

Changes

• Add a token-consuming cancelRuntimeCutover owner operation.
• Invalidate the canceled epoch without publishing an error.
• Retain and reproject deferred raw intents for one replay after the next successful cutover.
• Restore the settings error baseline that existed before the canceled cutover.
• Reject foreign, stale, copied, or repeated token use without mutation.

Testing

• Settings cutover suite repeated 25 times (300 executions)
• swift test --build-system swiftbuild --no-parallel
• Compatibility consumer, API, and MCP gates
• ReviewMonitor xcodebuild test (15 tests)
• Owner/concurrency audit and Codex review (0 findings)

Screenshots

Not applicable.

[lynnswap]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Delightful!

Reviewed commit: 06401256fb

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[lynnswap]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Bravo.

Reviewed commit: 6ab239e9c6

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".