When recipes/<cat>/<name> is a directory symlink into local/recipes/,
creating a file-level symlink at recipes/<cat>/<name>/recipe.toml
resolves through the dir symlink and CORRUPTS the real file at
local/recipes/<cat>/<name>/recipe.toml (replaces it with a broken
self-referencing symlink).
This was the root cause of 186 'broken recipe.toml' auto-repairs
on every build. Called via apply-patches.sh line 369.
Add guard-recipes.sh with four modes:
- --verify: check all local/recipes have correct symlinks into recipes/
- --fix: repair broken symlinks (run before builds)
- --save-all: snapshot all recipe.toml into local/recipes/
- --restore: recreate all symlinks from local/recipes/ (run after sync-upstream)
Wired into apply-patches.sh (post-patch) and sync-upstream.sh (post-sync).
This prevents the build system from deleting recipe files during
cargo cook, make distclean, or upstream source refresh.
vasilito