fix: expand e2e coverage and docs for session sync compatibility

[iHildy]

Summary

• extend session sync planning to include both legacy storage paths and opencode.db
• mark session sync items to preserve repo artifacts when the local source format is missing
• update sync apply behavior to honor preserve-on-missing semantics and handle SQLite sidecar files with opencode.db
• add regression tests for sync planning and apply behavior across missing/present session artifacts
• expand E2E tooling/docs to run feature-specific variants (including sessions), review result artifacts directly, and validate session rename propagation
• update README session docs to cover SQLite + legacy compatibility and restart expectations after pull

Testing

• bun run check
• bun test
• bun run build

[gemini-code-assist]

Code Review

This pull request introduces support for syncing the SQLite session database (opencode.db) and its associated sidecar files (-wal, -shm) while maintaining compatibility with legacy JSON session storage. Key changes include the implementation of a preserveWhenMissing flag in the sync logic to prevent accidental deletion of remote session data when local files are absent, and a new copySessionDbBundle utility to handle SQLite-specific file groups. The E2E testing framework has been significantly enhanced with new flags for secrets and sessions, retry logic for the sync-link command, and direct SQLite assertions to verify data integrity across synced instances. A bug was identified in the parse_jsonc helper function where a global regular expression could corrupt string values containing trailing comma patterns.

[jules-relay]

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