fix(iroh): carry cmux transport fixes on v1.0.2

[azooz2003-bit]

Description

• Base the cmux core fork on Iroh v1.0.2, including the transport-lane receive fairness fix needed by multi-stream consumers.
• Preserve fork main's post-release Crossbeam 0.9.20 invalid-pointer fix.
• Replay the bounded path-open retry queue, abandoned address-lookup cancellation, and same-URL relay token refresh changes without modifying their patches.

The seven replayed commits are patch-identical to their original history according to git range-diff.

Breaking Changes

None.

Testing

• cargo test -p iroh --all-features: 120 unit tests passed, 1 ignored; 1 integration test passed; 26 doc tests passed, 2 ignored
• cargo fmt --all -- --check
• cargo check -p iroh --all-features --all-targets
• cargo clippy -p iroh --all-features --all-targets -- -D warnings

Notes

This branch supersedes the consumer pin from the earlier bounded-retry and relay-refresh PRs while preserving both PR histories:

• fix(iroh): bound retry and lookup lifecycles #1
• Refresh active relay clients after config changes #2

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Summary by cubic

Rebased our iroh fork onto v1.0.2 and fixed cmux transport issues: cancelled lookups are released, path-open retries are bounded, and relay token rotation at the same URL restarts only the relay client without dropping existing connections.

• Bug Fixes

  • Cancel and drop hanging address lookups when a connect is aborted; stop lookup stream when no waiters remain.
  • Bound and deduplicate the pending path-open retry queue to 64 entries to prevent unbounded growth across multi-connection retries.
  • On same-URL relay config changes (e.g., token rotation), restart the active relay client with the new token while preserving endpoint identity and existing QUIC connections; keep advertising the prior home relay until a replacement is selected.

• Dependencies

  • Based on iroh v1.0.2, pulling in the transport receive fairness fix for multi-stream consumers.
  • Preserves the crossbeam 0.9.20 invalid-pointer fix.

^{Written for commit 8295188. Summary will update on new commits.}

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