feat: track both entry files in the repo

~/.claude/CLAUDE.md was in no git repo despite heavy editing, and
~/.codex/AGENTS.md was a hand-synced duplicate of it. Both now live in
entry/ and import the shared fragments; RTK.md moves to claude-md/ so
Codex stops carrying its own copy.

Claude's imports are ~/-anchored so they resolve through the symlink.

Also drops kt from the comment rule scope.

hooks/comment-lint.py

@@ -20,7 +20,7 @@ MAX_COMMENT_RUN = 3  # contract budget; past this you are teaching, not warning
 # the rule and never lints.
 CODE_EXT = {
     ".ts", ".tsx", ".js", ".jsx", ".mjs", ".cjs", ".py", ".rs", ".go", ".sol",
-    ".sh", ".bash", ".zsh", ".kt", ".rb", ".lua", ".zig", ".nix",
+    ".sh", ".bash", ".zsh", ".rb", ".lua", ".zig", ".nix",
     ".ex", ".yaml", ".yml", ".toml",
 }