Fix cache-memory path in repository-quality-improver workflow

[Copilot]

gh-aw's cache-memory mechanism only persists top-level directories (e.g. cache-memory-foo/); nested subdirectories like cache-memory/focus-areas/ are silently dropped between runs, breaking the focus-area diversity algorithm that depends on reading prior run history.

Changes

• workflows/repository-quality-improver.md: Replace all four occurrences of /tmp/gh-aw/cache-memory/focus-areas/ with /tmp/gh-aw/cache-memory-focus-areas/
  • Cache Location bullet in Current Context
  • Phase 0.1 prose description
  • Phase 0.1 if/cat bash snippet
  • Phase 3 mkdir -p bash snippet

-  **Cache Location**: `/tmp/gh-aw/cache-memory/focus-areas/`
+  **Cache Location**: `/tmp/gh-aw/cache-memory-focus-areas/`

-if [ -f /tmp/gh-aw/cache-memory/focus-areas/history.json ]; then
-  cat /tmp/gh-aw/cache-memory/focus-areas/history.json
+if [ -f /tmp/gh-aw/cache-memory-focus-areas/history.json ]; then
+  cat /tmp/gh-aw/cache-memory-focus-areas/history.json
 fi

-mkdir -p /tmp/gh-aw/cache-memory/focus-areas/
+mkdir -p /tmp/gh-aw/cache-memory-focus-areas/