fix: sync .cursor observe.sh and fix suggest-compact.sh session tracking

- Sync .cursor/observe.sh with corrected main version (use stdin pipe
  instead of broken heredoc json.loads pattern)
- Fix suggest-compact.sh to use CLAUDE_SESSION_ID instead of $$ which
  gives a new PID per invocation, preventing counter from incrementing

skills/strategic-compact/suggest-compact.sh

@@ -28,7 +28,9 @@
 # - Plan has been finalized
 
 # Track tool call count (increment in a temp file)
-COUNTER_FILE="/tmp/claude-tool-count-$$"
+# Use CLAUDE_SESSION_ID for session-specific counter (not $$ which changes per invocation)
+SESSION_ID="${CLAUDE_SESSION_ID:-${PPID:-default}}"
+COUNTER_FILE="/tmp/claude-tool-count-${SESSION_ID}"
 THRESHOLD=${COMPACT_THRESHOLD:-50}
 
 # Initialize or increment counter