fix(session): preserve queue and terminal finality

[beruro]

Summary

• persist queued messages and direct-user-intervention state across reloads
• preserve intent IDs through Rust-agent and CLI terminal events
• coalesce high-frequency streaming state edges without changing final event order
• fence stale queue dispatches, canvas/session switches, and fork terminal handling

Stack

Depends on the CLI lifecycle slice (#565), which depends on #512. This PR intentionally excludes chat-rendering experiments that were reverted in the original clean branch.

Validation

• 10 targeted Vitest files: 61 passed
• pnpm typecheck and changed-file ESLint
• cargo test -p agent_core lifecycle: 13 passed
• cargo check -p org2
• rustfmt check on all changed Rust files
• git diff --check junyu/cli-runner-intent-propagation...HEAD

State-machine coverage

Queued → running → terminal, direct intervention, reload recovery, reconnect/focus reconciliation, intermediate fork terminal, stale scope, and duplicate finality are all covered.