feat(divergence): make every ball identical and bind crazy mode to 0

Crazy mode first shipped as a side list of "crazy balls" with reduced
physics (walls, bumpers, flippers only) next to the original primary and
secondary slots. That is not what was wanted: a ball in the machine is a
ball, with no main/second/extra distinction. This replaces the two-slot
engine with one ordered list and moves the shortcut to a single key.

Ball model (src/game.rs)
- Game::balls: Vec<Ball> replaces `ball`, `secondary_ball`, and
  `crazy_balls`. The list is never empty while the game runs; a waiting
  ball is simply a ball with in_launcher set.
- advance_ball_slots runs one timer callback: every ball, in slot order,
  integrates up to `substeps` steps through the single integrator
  step_ball (record scan, ball-to-ball contact, rule dispatch, drain) and
  stops after its first collision, exactly like the original slot pass.
- BallPass carries the ball's current index plus the slot number and
  ball count from the start of the callback. The original keeps slot two
  numbered 2 for the rest of a callback even after slot one drained, and
  type-three contact records publish that number as their owner; keeping
  it per pass preserves that.
- Effect seven's ball goes to `spawned_balls` and joins after all slot
  passes, as the original publishes slot two only after slot one's pass.
- lose_ball removes a drained ball while others remain (Drain event,
  normal scoring once one ball is left) and only the last ball takes the
  special respawn or ends the player's ball. remove_ball keeps the claw's
  captured/entry indices and the claw and lock-hole contact owners
  pointing at the same physical ball when an earlier slot leaves.
- The claw stores a ball index instead of a Primary/Secondary enum.
- Nudge, flipper kicks, multiball scoring, and the "no third ball from
  effect seven" guard are expressed over the list. With one or two balls
  the original order, random draws, and ownership rules are unchanged;
  all existing parity and multiball tests pass after a mechanical port
  (test-only shims fixed_update, advance_secondary_ball, drain,
  secondary/set_secondary/take_secondary keep them readable).
- Crazy mode adds ten ordinary balls (capped at MAX_BALLS = 64 because
  contact records reserve 99 as a sentinel) and marks the player.

Deliberate differences from the original (also in PARITY_AUDIT.md),
mostly because there is no longer a special slot one:
- A ball resting on the shooter stop returns to an empty launcher from
  any slot; the original deleted a slot-two ball there. If the launcher
  is occupied the ball leaves the table without costing a ball.
- Flipper kicks, record countdowns, and target rotation keep running for
  balls in play while another ball waits in the launcher.
- Ball-to-ball contact skips only the claw-held ball; every ball's hit
  is published as last_collision_id.
- Stress runs with 10-64 balls showed balls trapped forever: two balls
  settle into one lock hole, one fills it (contact 99), and the rim then
  reflects the other from the inside. A filled hole's rim now only
  repels balls moving towards its center. Lock-hole owners of a removed
  ball are cleared/renumbered like the claw owner.

Input (src/app.rs)
- Crazy mode is the bare main-row 0 key. It overlaps no original or
  modern binding and has no browser default action, so the WASM build
  receives it. The Ctrl+Shift+0 combo and its Shift-release nudge
  suppression are gone.
- Rendering draws every ball not held by the claw.

Simulator: snapshots report `balls: [...]` instead of `ball` and
`secondary_ball`; autoplay flips for any ball near a flipper.

Test Plan:
- cargo test (160 tests), including new ones:
  a_ball_moves_the_same_in_any_slot (same ball in slot one vs. behind a
  waiting ball follows the identical trajectory),
  crazy_mode_adds_ten_ordinary_balls_and_marks_the_player,
  the_turn_ends_only_when_the_last_ball_drains,
  shooter_stop_rearms_a_returning_ball_from_any_slot,
  crazy_mode_is_capped_and_rejected_after_the_game.
- A temporary release-mode stress test (not committed) ran 12 seeded
  two-player games with crazy mode, autoplay flippers, and nudges to
  completion, and 4 seeds at the 64-ball cap for 30k frames, asserting
  finite state, a non-empty ball list, and valid claw indices.
- Manual: during a game press 0 (also in the browser build); ten balls
  appear, each can be captured by the claw, lock holes, and targets, and
  the turn ends only after the last ball drains.

tdkpin-rs/PARITY_AUDIT.md

@@ -66,6 +66,28 @@ ledger in `../original/C_RECONSTRUCTION_FINAL_AUDIT.md`.
   on those hosts is delegated to the repository's three-OS CI matrix. The
   semantic core is platform-independent and has no target-specific branches.
 
+## Modern additions and their divergences
+
+Crazy mode (main-row `0`) adds up to 64 live balls. To make every ball behave
+identically, the two original timer slots became one ordered ball list. One-
+and two-ball play keeps the recovered slot order, slot-numbered contact
+ownership, deferred effect-seven spawn, survivor identity, nudge draws, and
+multiball scoring, and all multiball tests above still pass. These deliberate
+differences follow from treating every ball alike:
+
+- A ball resting on the shooter stop returns to the launcher from any slot (the
+  original deleted a slot-two ball there) unless another ball already waits.
+- Flipper kicks, record countdowns, and target rotation continue for balls in
+  play while another ball waits in the launcher.
+- Ball-to-ball contact ignores only the claw-held ball, and every ball's
+  collision is published as the last collision record.
+- When a ball leaves, claw and lock-hole contact owners move with their ball,
+  and a lock hole the leaving ball was settling into is freed.
+- The rim of a filled lock hole only repels balls from the outside, so a ball
+  that was settling into it when another ball filled it rolls back out.
+- High-score entries carry a `crazy` flag that both local storage and the
+  shared service persist; older entries default to normal scores.
+
 ## Reproducible final gates
 
 ```sh