1. Engine settlement

• [x] 1.1 Add the Tidewater fixture where SINK destroys the STOP word and the next move enters ROCK.
• [x] 1.2 Reparse surviving words and rebuild rule, property, sentence, and automata indexes after contact removals without rerunning contacts or transformations.
• [x] 1.3 Evaluate final victory from surviving entities and refreshed properties; include final rule removal in settled event deltas.

2. State restoration and integration

• [x] 2.1 Cover destruction followed by Undo, reset, and restore, including no stale rule or object indexes.
• [x] 2.2 Run Node tests and build; verify browser controls, rule changes, bundled CommonJS mod loading, and Undo.
• [x] 2.3 Reverify Tidewater's seven proofs with the real-engine solver and report any changed route to the worlds team.

3. Ship

• [x] 3.1 Strictly validate and archive the OpenSpec change, commit the behavioral fix as a focused unit, and update the stable public preview.