fix(world3): make level-45 world-3-finale reachable

[sv-tmueller]

Summary

Fix W3#15 (world-3-finale, level-45.json) by adding mechanics and intermediate one-way platforms to make the 20-row vertical level reachable.

Changes

Mechanics added

• Teleporter pair: (10,21) <-> (7,16) -- bridges the 5-tile gap from the spawn area (row 21) to the mid-level platforms (row 16)
• Moving platform (left): (7,16) -> (4,12) -- bridges the 4-tile gap on the left side of the midsection
• Moving platform (right): (13,16) -> (5,12) -- bridges the 4-tile gap on the right side
• Control inversion (duration=-1): always-on reversed controls as a gameplay challenge (consistent with W3#8 reverse-commute)

Geometry adjustments (one-way platforms)

• Row 2, cols 2 and 17: makes both exit positions standable (base exit at (17,1) and mutation-3 exit at (2,1))
• Row 3, col 4: creates a stepping stone for the path to the attempt-3 exit at (2,1)
• Row 5, col 10: bridges the row 6 to row 4 gap (solids at row 5 block direct vertical jumps at the existing platform columns)
• Row 9, col 8: bridges the row 10 to row 6 gap (avoids the solid at (7,7) that would obstruct jumps from col 7)
• Row 11, col 7: bridges the row 12 to row 10 gap (horizontal distance exceeded the jump envelope without an intermediate platform)

Verified path (base level, exit at (17,1))

Spawn(2,21) -> walk -> (10,21) -> teleport -> (7,16)
-> ride platform -> (4,12) -> walk -> (5,12)
-> jump -> (7,10) -> walk -> (9,10) -> jump -> (8,8) -> jump -> (6,6)
-> walk -> (7,6) -> jump -> (10,6) -> jump -> (14,6)
-> jump -> (10,4) [via oneway at (10,5)] -> jump -> (14,4)
-> jump -> (16,2) -> jump -> (17,1) = EXIT

Mutation variants

• Attempt 2 (resize-gap): no effect on path -- row 16 cols 7-9 already empty
• Attempt 3 (move-exit to (2,1)): alternate path via (5,4)->(4,2)->(2,1) using new oneway at (4,3)
• Attempt 4 (set-tile (10,8)=1, (11,8)=1): new solids dont obstruct any jumps (obstruction check uses source column only; our path uses col 8)

Validation

• All 1340 tests pass (npm test)
• ESLint clean (npm run lint)
• TypeScript clean (npm run typecheck)
• Reachability validator confirms all 4 mutation variants reachable

Closes #140

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