feat(game): 6-frame 2.5D re-art batches G, 2, 3

[hyochan]

Summary

• Guardian combat presentation: spawn slam ring + camera kick on landing, speed-line streaks on forest charges, full-shake kill with a wider death burst. Boss accent palette only; capture-frozen flows skip shakes.
• 2.5D re-art bible (notes/plans/art-25d-pass.md): style definition (2.5D pixel art, layout locked), 85-sheet inventory, batch order G→H→S→W→U, course impact.
• Batch G: all 22 guardian sheets re-cut to 6 frames (384x64 strips from ChatGPT 2x3 grid drops), guardian_state_frames 4→6.
• Batch 2: all 7 spirit sheets swapped to 6-frame ChatGPT art (288x48, facing-less). Combat timing unchanged.
• Batch 3: relic picker reskinned — 4 hand-drawn card states (168x112) + one 48x48 emblem per relic (16). Galmuri font restored on cards.
• Art tooling: tools/slice_gpt_grid.py (bleed validation, cell-scaled fill), tools/slice_gpt_cells.py (aligned full-cell + bbox-fit).

Checked

• pnpm verify exit code 0
• CI green (docs, game check, repo rules, APK/AAB build)
• Render-verified: guardians, spirit grid 7x6, relic cards + longest routes (en/ko/ja)
• Contracts: 16 icons + 4 cards on disk; 22 guardian sheets 384x64; 7 spirit sheets 288x48
• No .godot/, no secrets

Store screenshots are stale by design (art changed). No recapture without explicit instruction.

Do not merge yet — awaiting review.

[hyochan]

Closing without merging. The re-art regressed the game rather than upgrading it,
and 3.0.0 will redo this ground-up alongside a new UI and story pass.

The branch stays — feat/guardian-presentation is not deleted, and the
relic icons and card frames here are worth pulling forward.

What a visual diff against main found

• Facing was dropped. Every spirit went facings = 4 → 1, sheets 192x192
  (4 directions x 4 frames) → 288x48 (1 direction x 6 frames). In a top-down
  dodge game the mobs no longer turn toward the player.
• Two sprites landed on the wrong kind. drifter.tres is 밤 박쥐 (night bat)
  but received jellyfish art; swarm.tres is 작은 불티 (little spark) but
  received the bat art.
• Cells overflow. caster.png frame 1 is clipped at the sheet's left edge
  and several frames bleed across the 48px cell borders.
• The 6 frames are not an animation. The guardian frames are near-identical
  renders with jittering anchors and sizes, so playback reads as shimmer rather
  than a cycle.
• The relic panel layout broke. The 168x112 card bitmap was dropped behind an
  unchanged text layout with no 9-slice: the title sits above the frame, the
  footer below it, the description overflows left and right in en/ko/ja, and a
  white rounded selection rect competes with the card art.
• The tone went the wrong way. Dark, low-contrast, detailed, semi-realistic.
  Moonlit Beacon is meant to stay a cute, small mini-game — richer art is
  welcome, gritty and epic is not.

Salvage list for 3.0.0

• 16 relic emblems (48x48) and the 4 card-frame states (168x112) — but only with
  a real 9-slice layout pass behind them
• tools/slice_gpt_grid.py and tools/slice_gpt_cells.py, once they enforce a
  shared anchor and reject cell bleed
• The guardian combat presentation (spawn slam, speed lines, kill shake) is
  independent of the art and can be revisited on its own

2.1.0 shipped from main as the final tutorial release:
https://github.com/hyodotdev/MoonlitBeacon/releases/tag/release-2.1.0