[Windows App] Request to submit deferred migration line-ending checksum fix

Hello,

I have a reviewed and tested fix for the SQL migration CRLF/LF checksum issue tracked in #32643.

Root cause:

SQLx checksums the exact migration bytes embedded at compile time. Migration files checked out with CRLF (for example, on Windows with core.autocrlf=true) therefore produce different checksums than LF checkouts. Databases created by one build fail to open in another with:

migration N was previously applied but has been modified

This also breaks the Windows + WSL shared-Codex-home scenario tracked in #25216 (see #23777, #23841, #23848, #23863), where a WSL runtime must open a database created by a Windows build and vice versa.

Fix:

• Canonicalizes runtime migrations to LF line endings on all platforms in runtime_migrator(), so embedded checksums no longer depend on checkout line-ending policy.
• Adds repair_migration_line_ending_checksums(): when opening any runtime SQLite database, _sqlx_migrations rows whose checksum was computed from CRLF migration files are rewritten to the canonical LF checksum, so histories created by either build are accepted interchangeably.
• Applies to all six runtime migrators (state, logs, goals, memories, queue, thread history).
• Genuine migration drift is still rejected: the repair only rewrites rows that exactly match the CRLF form of the current migration.

Validation:

• codex-state: 174/174 tests passed, including 4 new tests (LF invariant across all runtime migrators, CRLF→LF canonicalization, CRLF-applied history accepted after repair, LF-applied history unchanged)
• scoped Clippy (just fix -p codex-state): clean
• cargo fmt --check: clean
• Change is limited to codex-rs/state (+205/-1 across 3 files)

Prepared patch

The fix is available in my fork:

• Fork: [jamespud/codex](https://github.com/jamespud/codex)
• Branch: [fix/32643-state-migration-line-endings](https://github.com/jamespud/codex/tree/fix/32643-state-migration-line-endings)

GitHub currently blocks PR creation because only collaborators may open pull requests in this repository.

Could you please either:

• invite jamespud as a collaborator with permission to open the PR, or
• open the PR from the prepared fork branch?

Thank you.

Review the prepared fix on the fix/32643-state-migration-line-endings branch, limited to codex-rs/state and its runtime_migrator and repair_migration_line_ending_checksums entry points. Run the reported codex-state tests, scoped Clippy, and cargo fmt check; done means the prepared change can be submitted and the stated migration checksum cases pass without accepting genuine drift.