feat(textures): author animated azure water frame strips and manifests (#68) - #256

Description

Closes #68.

Implements Task 2.1.9 by authoring animated still and flowing water textures matching the clean, flat trailer aesthetic seen in official Minecraft animations and promotional shorts.

• water_still: Authored as a uniform, flat translucent fluid (#ffffff, opacity 0.78) across a 16-frame animation strip. Eliminates internal grid lines and wireframe artifacts on 3D cube block faces under water, providing crystal-clear visibility and pure trailer azure when multiplied by dynamic engine biome colormaps.
• water_flow: Authored with delicate longitudinal current ribbons and downstream wave crests to indicate flow momentum without harsh crosshairs.
• Animation Manifests: Paired with companion manifests (water_still.png.mcmeta with frametime 2 and interpolation, and water_flow.png.mcmeta with frametime 1 and interpolation).
• Toolchain Updates:
  • tools/lib/vector-linter.mjs: Updated viewBox validation to support multi-frame vertical animation strips (0 0 512 (512 * N)).
  • tools/test-tiling.mjs: Evaluates vertical seam continuity per frame for multi-frame strips. Both textures achieve zero discontinuity.
  • tools/build.mjs & tools/release.py: Excluded fluid textures (water_*, lava_*) from LabPBR normal and specular map generation and release inventory requirements.

Affected Assets

• textures/block/water_still.svg
• textures/block/water_still.png.mcmeta
• textures/block/water_flow.svg
• textures/block/water_flow.png.mcmeta
• tools/lib/vector-linter.mjs
• tools/test/vector-linter.test.mjs
• tools/test-tiling.mjs
• tools/build.mjs
• tools/release.py
• .gitignore

Type of Change

• feat: New vector texture master, blockstate, or compiler capability
• fix: Tiling fix, palette correction, or bugfix
• docs: Documentation improvement
• chore / refactor: Maintenance, dependencies, or codebase cleanup

Contributor Checklist

Please check all applicable boxes before requesting review:

Vector Texture Standards (if adding/modifying SVGs)

• Authored as a clean $512\times512$ SVG (viewBox="0 0 512 512" or vertical multi-frame strip 0 0 512 8192).
• Primary shapes are aligned to the $32\text{px}$ texel grid ($16\times16$ grid).
• Seamless Toroidal Tiling: Checked and verified that elements wrapping across $X$ and $Y$ edges align perfectly without seams or chopped shapes.
• Ore Consistency: If adding an ore texture, the stone background geometry and corner radius (rx) match textures/block/stone.svg exactly.
• Free of leftover AI generation comments, unnecessary editor namespaces, or embedded raster images.

Build & Verification

• Ran npm run build locally and verified that the pack compiles successfully.
• Verified textures in-game or inspected the rasterized PNG outputs in dist/.

Git Hygiene & Standards

• Commit message(s) follow Conventional Commits (e.g., feat(textures): ...).
• Every commit is signed off with the Developer Certificate of Origin (git commit -s).
• Branch is rebased cleanly onto latest main with no merge commits.
• Formatting complies with .editorconfig (2-space indent, LF endings, trailing newline).