Add rooms TUI live client

[lsaether]

Summary

• Add reusable rooms-client foundations: attach URL/protocol builders, typed event parsing, WebSocket transport, and a UI-neutral RoomState reducer for roster/transcript/active turn/queue/permissions/replay/debug state.
• Add the live rooms-tui client: room-native CLI, ratatui event loop, connection/bootstrap status, reducer snapshot rendering, prompt draft entry, submit/queue/steer/cancel/unqueue controls, and first-class permission replies.
• Add reconnect/replay recovery with capped backoff, replay dedupe keyed by _meta.rooms.replaySeq, and actionable wrong-port/wrong-endpoint/peer-id-collision diagnostics.
• Document the daily-driver roadmap and the intended next manual gate before building the durable smoke/regression harness.

Validation

• cargo fmt --all --check
• cargo test -p rooms-client -p rooms-tui
• cargo clippy --workspace --all-targets -- -D warnings
• cargo test --workspace
• git diff --check
• Added-line security/private-network scan against origin/main...HEAD: clean
• cargo run -q -p rooms-tui -- --help

Notes

• Rebased onto current origin/main before opening; the already-merged named-agent config commits were skipped/dropped during rebase.
• The next slice is intentionally manual daily-driver validation: attach to a real room, submit/queue/steer/cancel, answer permissions, restart the server, force reconnect/replay, then use findings to shape the final harness.