Export Path Hardening and Test Isolation Pass
After Paula completed Pass 4, the export path was functional but still carried a testability problem: export tests wrote real `.txt` files into the user's Downloads folder. Cody tightened the export boundary so production behavior remains unchanged while tests can use isolated temporary directories.
`VaultStore` now accepts an `exportDirectoryURL` in its initializer, defaulting to Downloads for normal app use. Both `exportNoteDraft(for:)` and `exportBackup()` use that configured directory and create it when needed. The store now records `lastExportedDraftURL` and `lastBackupURL`, giving the app and tests a durable reference to the most recent local export.
The draft export filename path was strengthened with a `safeFileComponent(_:)` helper so session names are converted into filesystem-safe components. The draft export success alert now names the exported file instead of giving only a generic Downloads confirmation.
The VaultStore export tests now pass an isolated temporary export directory instead of writing to the real Downloads folder. A new test confirms that the exported `.txt` file exists in the configured directory and contains the generated progress note text.
Verification completed with `swift build` and `Tools/run-tests.sh`. The full suite reports 49 tests, 0 failures.
Decisions
- Keep Downloads as the default export destination for production behavior.
- Allow tests and future workflows to inject a different export directory.
- Track the last exported draft and backup URLs on VaultStore.
- Keep export alerts human-readable by naming the generated file.
- Avoid using real Downloads during automated tests.
Next Actions
- Start Paula's next substantial pass in a fresh session.
- Assign Paula a bounded Pass 5 only after choosing the next product layer deliberately.
- Consider a future in-app export history surface if exported artifacts become a repeated workflow.