feat: season 2 'Summer Tide' content and manifest generator

Adds Summer Tide (season_002) — 30 stages with deep-teal gradient and
cyan accent — generated remote-only (no copyToAssets). Introduces
tool/make_manifest.dart to rebuild content/manifest.json from all
season packs with SHA-256 verification support.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
2026-06-12 13:45:22 +09:00
parent 9763968db9
commit ba70db3e60
5 changed files with 2346 additions and 0 deletions
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