AKUNUR 3.2.0-alpha.1 - SHARED QUALIFICATION PLAYTEST

Purpose
-------
This build embeds the shared three-player qualification rule so it no longer
needs to be enforced manually during browser testing.

Expected three-player behaviour
-------------------------------
1. Start a three-player game and reset.
2. Status shows Corner phase: Closed and identifies players still awaited.
3. No corner may be entered or captured while any player has not yet completed
   a Still Point passage.
4. Clicking a closed corner displays an explanatory warning.
5. Closed corner cells are visually muted.
6. The final player's first completed Still Point passage opens all six corners
   immediately. The log records that transition and Status shows Corner phase: Open.
7. All other movement/capture/AI behaviour is inherited from 3.1.0.

Deliberately not changed
------------------------
- Two-player corner qualification rule.
- Tactical AI strategy.
- Existing scoring (the proposed 5-point takeover score is not in this alpha).
- Browser move limit: still 400.
- Bundled PDF: still the 3.1 reference; use in-game Rules for this alpha.

Validation
----------
Run: npm test
Dedicated rule check: npm run shared-qualification
