[kinqsradio]

Summary

Fixes the flaky tests seen on main in recent runs, each with the cause found.

• outside_files (Rust): the refusal of a file with a second name depended on which hard-link name macOS reports; the link-count check now runs first, before any path is read back. Nothing leaked before; the refusal just came with a different message.
• Saved sessions (product bug): dev React StrictMode sends the capabilities request twice and the service lets one native operation per agent run at a time; the second was turned away as busy and the UI never asked again. The read now retries up to 6 times with a growing delay.
• Worktree cleanup: turning cleanup on after Off starts at 7 (it could read the old typed number first); the unit test waits for the select to be enabled.
• Archived banner test: archives the thread on the mock service before rendering.
• preview-input-trace (quarantined): it did not reproduce; test.fixme with issue Flaky e2e: preview-input-trace link navigation and same-URL reload (title stays on the old document) #339.

Not in this PR

• A fix for preview-input-trace (Flaky e2e: preview-input-trace link navigation and same-URL reload (title stays on the old document) #339).

Parity rows

none

Testing

• CI covers the rest.
• Locally: npm run -s check, 1447 unit tests, cargo fmt and clippy -D warnings, the affected specs twice.
• Not tested: most of these never failed locally, so the causes come from reading the code and CI logs, not from a reproduction.

Risk: outside_files check order (security fence), saved-sessions retry. Undo: revert the merge commit.

Co-authors

none

AI usage

• Written by hand, with no AI
• Harness and version: Claude Code 2.1.318
• Models: claude-opus-5-5 (lead and review), claude-sonnet-5-5 (implementation)
• Effort: medium
• Human role: Anh set the scope.
• Sources: none

Checklist

• Works on Windows and macOS
• web/src/generated with any contract change; docs/architecture.md with any rule change
• No copied source, secrets, credentials or personal data; no AI attribution in commits, title or branch