fix(build): Add file-level dependencies for assets (shaders, meshes, audio)

CRITICAL FIX: Changing .wgsl/.spec/.obj files now triggers asset regeneration.

Problem: CMake only tracked demo_assets.txt, not individual asset files.
Result: Editing shaders didn't trigger rebuilds → stale code in binary!

Solution: Parse demo_assets.txt to extract all asset filenames and add them
to DEPENDS clause in add_custom_command(). Now CMake tracks all 42 assets.

Implementation:
- Added parse_asset_list() function to extract filenames from asset list
- Regex parses format: ASSET_NAME, COMPRESSION, FILENAME, DESCRIPTION
- Filters out PROC() entries (procedural, no file on disk)
- Adds full paths to DEPENDS for both pack_assets() and pack_test_assets()

Performance impact:
- Before: touch shader → 0.28s (no rebuild, STALE!)
- After:  touch shader → 3.55s (regenerates assets, rebuilds users)

Files tracked: 42 demo assets + 17 test assets
- Shaders: renderer_3d.wgsl, mesh_render.wgsl, skybox.wgsl, etc.
- Audio: kick1.spec, KICK_606.spec, snare samples, bass samples
- Meshes: dodecahedron.obj, other geometry

Developer workflow: No more 'touch demo_assets.txt' workaround needed!
Just edit shaders and rebuild - dependencies work correctly now.

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