chore(gitignore): drop blanket *.json ignore, track configs directly

The global *.json rule (added for transient ComfyUI workflow dumps) forced
git add -f on real configs and hid tauri.conf.json from tauri-action's
gitignore-aware globbing. Removed it and the negation workarounds; local-only
ignores (e.g. skills-lock.json) live in .git/info/exclude instead.

.gitignore

@@ -32,17 +32,8 @@ dist-ssr
 
 # Misc
 *.py
-*.json
-
 *.pyc
 
 # Bundled CUDA runtime DLLs for the CUDA build (copied from the toolkit
 # locally; ~600 MB, never committed). See RELEASE_PLAN.md "CUDA release variant".
 src-tauri/cuda-redist/
-
-# Keep the Tauri configs tracked despite the *.json rule above. tauri.conf.json
-# must also be un-ignored so tauri-action can find it: it globs for the config
-# honoring .gitignore, and an ignored config makes the release build fail with
-# "Failed to resolve Tauri path".
-!src-tauri/tauri.conf.json
-!src-tauri/tauri.cuda.conf.json