[cycle-five]

v0.22.0 — wire support for the turn and presence owner

Additive only. Every new field is optional with #[serde(default)] and is omitted when absent, and every new message is a new variant. An older backend or frontend keeps working.

Design: workspace spec docs/superpowers/specs/2026-10-17-turn-and-presence-owner-design.md, plan docs/superpowers/plans/2026-10-17-turn-and-presence-owner.md (Task 1).

Changes

• TurnPassReason (voluntary | timer | disconnected | left) and TurnPassed.reason: Option<…> — every pass names why (D6); absent means unknown.
• PlayerReconnected.game_id: Option<String> — the server now broadcasts a return (D2).
• ConnectKind (fresh | reconnect | take_over) and ConnectParams { tab, kind } — the WebSocket URL handshake (C1, C2) that decides which connection holds a seat (D3).
• ServerMessage::ConnectionReplaced — told to a connection that lost its seat to another window (D3).
• ServerMessage::GameFull { game_id, game_type } — told to a pooled player the cap left out of a start (D11).
• ModeCap and LobbySnapshot.mode_caps: Vec<ModeCap> — each mode's cap is advertised (D9). max_players is unchanged for older clients.

Verification

• cargo test: 112 passed, plus 2 doctests. Each addition has a wire test in both directions: old JSON without the field parses, and an absent value is not serialized.
• cargo doc --no-deps: 0 warnings. cargo clippy --all-targets: clean.
• Self-reviewed for wire compatibility; the protocol repo has no automated reviewer.

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