Untrack the local CLAUDE.local.md symlink

It points at a path under my home directory and was committed by accident
in #556, so a fresh clone gets a dangling symlink. The file's own preamble
calls it untracked guidance for one checkout; ignore it like coucal and
httrack-windows already do.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Xavier Roche <roche@httrack.com>

.gitignore

@@ -43,3 +43,6 @@ Makefile
 
 # Python bytecode (tests/local-server.py).
 __pycache__/
+
+# Per-checkout Claude Code rules (symlink into a local sandbox).
+/CLAUDE.local.md

CLAUDE.local.md

@@ -1 +0,0 @@
-/home/roche/git/httrack-works/CLAUDE.httrack.local.md