memory: track agent memory in repo .claude/memory (symlinked from harness path)

Move per-project agent memory into the repo so it is version-controlled.
Harness path /root/.claude/projects/.../memory now symlinks here, so
auto-load still works while the files live under git. Un-ignore only
.claude/memory/ (worktrees, locks, local settings stay ignored).

Co-Authored-By: Claudypoo <288921227+claudypoo@users.noreply.github.com>

.gitignore

@@ -1,4 +1,5 @@
-.claude/
+.claude/*
+!.claude/memory/
 .venv/
 /out/
 /data/