Address yamux transport review findings

[Kirari04]

Summary

• Removes the public docs/.plans handoff ledger and ignores docs/.plans/ going forward.
• Addresses the valid CodeRabbit findings from PR Merge yamux agent transport rewrite #45:
  • tunnel DB/hub registration now happens after the Yamux session is established,
  • tunnel version strings use tunnel.ProtocolVersion,
  • agent tunnel bootstrap has a bounded response-header timeout,
  • agent transport pool invalidation happens before refresh can fail,
  • dialViaAgent handles cancellation during stream open/open handshake,
  • test/smoke resource leaks and brittle assertions are fixed,
  • make kill no longer hard-fails without ss.

Validation

• git diff --check
• go test ./internal/server -run 'TestRotateAgentTokenClosesTunnelConnection|TestAgentTunnelRejectsDuplicateConnection|TestAgentTransportPool|TestAgentProxy|TestPublicBackendHealth'
• go test ./internal/agent
• go test -tags docker_smoke -run '^$' ./internal/smoketest ./internal/smoketest/upstream
• go test ./...
• go vet ./...
• bun run --cwd web/management typecheck

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 91f688f2-1a26-4a12-9f52-6288a0256a2c

📥 Commits

Reviewing files that changed from the base of the PR and between 3d67338 and ab864de.

📒 Files selected for processing (11)

• .gitignore
• Makefile
• agent_tunnel_test.go
• docs/.plans/agent-yamux-overhaul.md
• internal/agent/agent.go
• internal/server/agent_registry.go
• internal/server/public_backend_health_test.go
• internal/server/public_routing.go
• internal/server/server.go
• internal/smoketest/docker_smoke_test.go
• internal/smoketest/upstream/main.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/yamux-merge-final-ledger

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