fix: refresh shared agent manifest caches

[akbash-bot]

Summary

• detect remote manifests committed by another named server during this server's update check
• selectively refresh only successfully checked agent caches and reset their detection runtimes
• keep commit reporting/toasts separate from cache activation

Checks

• focused stale-cache, mixed-success, retained-status, runtime-reset, and toast tests
• just ci "all() - test(live_server_holds_one_pty_master_fd_per_pane)" (3420 passed; the excluded live-handoff test reproducibly failed alone on this VPS because its replacement server never appeared)
• just windows-lint
• maintenance Python test suite (98 passed)

refs #2711

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 5600197 and 6359620.

📒 Files selected for processing (5)

• src/app/actions.rs
• src/app/api.rs
• src/detect/manifest.rs
• src/detect/manifest_update.rs
• src/events.rs

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