build: normalize all line endings to LF

One-time renormalization pass under the .gitattributes added in the
previous commit. Every tracked text file now uses LF. No semantic
changes — verified via git diff --cached --ignore-all-space showing
zero real differences. Future diffs will only show real content
changes.

This commit will appear huge in git log --stat but represents zero
behavior change. Use git log --follow --ignore-all-space or
git blame -w when archaeologically tracing through this commit.

.gitignore

@@ -1,13 +1,13 @@
-# Operator-identifying config and secrets (v0.3 split)
-/data/config/local.yaml
-/data/config/secrets/
-/data/secrets/
-.env
-.env.local
-.env.*
-!.env.example
-local.yaml
-!local.yaml.example
+# Operator-identifying config and secrets (v0.3 split)
+/data/config/local.yaml
+/data/config/secrets/
+/data/secrets/
+.env
+.env.local
+.env.*
+!.env.example
+local.yaml
+!local.yaml.example
 # Python
 __pycache__/
 *.py[cod]
@@ -59,13 +59,13 @@ data/
 # OS
 .DS_Store
 Thumbs.db
-# Operator-identifying config and secrets (v0.3 split)
-/data/config/local.yaml
-/data/config/secrets/
-/data/secrets/
-.env
-.env.local
-.env.*
-!.env.example
-local.yaml
-!local.yaml.example
+# Operator-identifying config and secrets (v0.3 split)
+/data/config/local.yaml
+/data/config/secrets/
+/data/secrets/
+.env
+.env.local
+.env.*
+!.env.example
+local.yaml
+!local.yaml.example