fix: Store session handle before manifest write in handle_resume

[2witstudios]

Summary

• Race condition in handle_resume: The session handle was stored in the session map AFTER writing the manifest, but handle_spawn explicitly stores it BEFORE (with a comment explaining why). The Swift app's ManifestWatcher fires on manifest write and immediately tries to attach — if the session handle isn't in the map yet, the attach fails silently.
• Rollback path fix: On manifest update failure, the old code tried to kill a handle variable that had already been moved. The new code properly removes the session from the map and kills it, matching handle_spawn's rollback pattern.

Test plan

• cargo check passes
• All unit and integration tests pass (cargo test)
• Manual: suspend an agent, resume it, verify the Swift app attaches immediately without a retry delay

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Configuration used: defaults

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Run ID: aadc89e6-8179-43d0-af66-611d3bae1d01

📥 Commits

Reviewing files that changed from the base of the PR and between 55aa882 and 2b4deeb.

📒 Files selected for processing (1)

• crates/pu-engine/src/engine.rs

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🧪 Generate unit tests (beta)

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• Commit unit tests in branch pu/fix-4

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