fix(browser): reject pending calls on invalidation

[green3sf]

Issue for this PR

Closes #154

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Session.invalidate() removed the active socket before its close handler ran, so the handler treated the socket as superseded and left in-flight CDP calls pending.

Rejecting and clearing the pending calls during invalidation makes them settle with the same retirement error.

How did you verify your code works?

• Added a regression test with an unanswered CDP call.
• Reproduced with a local loopback WebSocket: before the fix it remained pending; after the fix it rejected immediately.
• git diff --check passes.
• The Bun test suite was not run locally because Bun is unavailable; CI will run it.

Screenshots / recordings

Not applicable.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

---

Summary by cubic

Rejects in-flight CDP calls when a session is invalidated to prevent hangs. Previously, Session.invalidate() removed the socket before its close handler ran, leaving pending calls unresolved; now it rejects and clears all pending calls with the same retirement error.

• Impact: In-flight CDP calls will now reject immediately on invalidation. If you relied on them remaining pending, handle the retirement error instead.

^{Written for commit 6fbf5db. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}