Address review findings on the FN-7956 hang fix:
- Per-tool outer timeouts so fn_research_run(wait_for_completion) is not clipped by a flat 60s budget
- Longer budgets for skills install, import/browse, and web_fetch
- Boot-failure cooldown + orphan-boot log when store boot times out
- Log timeout/abort/errors from the extension wrap; clearer host-extension skip reason
- Tests for budgets, research wait, and sessionPurpose forwarding
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