fix(W2#14): add spring and moving-platform to timing level-29

[sv-tmueller]

Summary

Fix W2#14 (timing, level-29.json) by adding spring and moving-platform mechanics to make the exit reachable.

Problem

Level-29 ("timing") has a 4-row vertical gap (spawn row 9, exit row 5). The player's max jump rise is 2 tiles, and the exit tile at (17, 5) has no floor beneath it — making the level unreachable.

Solution

Added two mechanics entries:

1. Boost spring at tile (8, 9) — impulseY: -440

   • Rise: 440² / (2 × 900) / 16 ≈ 6.7 tiles, easily clearing the 4-row gap
   • Provides an alternate boosted route from the spawn floor to upper platforms

2. Moving platform from (17, 9) → (17, 5) — vertical lift

   • Makes both endpoint tiles standable via the validator's extraStandable mechanism
   • Rides the player from the ground floor directly to the exit row

Validation

• ✅ Reachability validator: exit reachable (BFS finds path spawn → row 9 traversal → (17,9) → platform ride → (17,5) = exit)
• ✅ All 1340 tests pass
• ✅ Typecheck clean
• ✅ Lint clean

Closes #138

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