[aliasfoxkde]

Summary

• Keep failed sandbox destruction handles in a bounded cleanup queue instead of dropping them after one failed or timed-out attempt.
• Retry exact-container teardown with capped exponential backoff, at most two concurrent reapers, and idempotent handling for already-removed containers.
• Route timeout, cancellation, shutdown, workspace release, and pool release through the same cleanup path.
• Replace the timeout integration test's manual cleanup with an assertion that the job container disappears automatically; add equivalent cancellation coverage.

Validation

• cargo test --offline -p gitforge-runner --lib — 127 passed, 2 ignored.
• Fedora Podman integration: test_real_docker_job_timeout_reaps_sandbox — passed.
• Fedora Podman integration: test_real_docker_job_cancel_reaps_sandbox — passed.
• cargo test -p gitforge-sandbox --lib — 94 passed, 3 ignored.
• Strict clippy for gitforge-runner and gitforge-sandbox — passed.
• cargo fmt --all -- --check and git diff --check — passed.

Refs #277. This PR addresses in-process teardown retries. Persistent cleanup recovery after abrupt runner-process death and pressure-aware job admission remain open follow-up work in #277.

[coderabbitai]

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