T-7.5: Reconciliation at server startup

[kirich1409]

Summary

• New reconciliation.rs — three-step startup sync (dead sessions, orphan containers, orphan networks)
• Extended store.rs with list_active_sessions(), force_stop_session()
• Extended docker.rs with list_managed_containers(), list_managed_networks(), remove_network_if_exists()
• Wired into main.rs at startup when relay.db exists

Closes #26

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Implements a server-startup reconciliation pass in the runner to synchronize SQLite session state with Docker resources after unexpected restarts/crashes (issue #26).

Changes:

• Added runner/src/reconciliation.rs implementing a 3-step startup cleanup (dead sessions, orphan containers, orphan networks) with logging.
• Extended Store with list_active_sessions() and force_stop_session() to support reconciliation without optimistic-concurrency retries.
• Extended DockerOrchestrator with helpers to list managed containers/networks and remove networks safely; wired reconciliation into run_server() when relay.db exists.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
runner/src/store.rs	Adds DB helpers for reconciliation: list active sessions and force-stop them.
runner/src/reconciliation.rs	New reconciliation module + unit tests for the new Store methods.
runner/src/main.rs	Runs reconciliation during startup when relay.db is present.
runner/src/docker.rs	Adds Docker listing/removal helpers for managed resources used by reconciliation.

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