fix: remove dead export, harden session-aliases, sync .cursor scripts

- Remove duplicate getAliasesPath() from utils.js (only used in
  session-aliases.js which has its own copy)
- session-aliases.js: validate cleanupAliases param is a function,
  check saveAliases return value, guard resolveAlias against empty input
- Sync .cursor/skills/strategic-compact/suggest-compact.sh with the
  fixed main version (CLAUDE_SESSION_ID instead of $$)

.cursor/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

scripts/lib/session-aliases.js

@@ -154,6 +154,8 @@ function saveAliases(aliases) {
  * @returns {object|null} Alias data or null if not found
  */
 function resolveAlias(alias) {
+  if (!alias) return null;
+
   // Validate alias name (alphanumeric, dash, underscore)
   if (!/^[a-zA-Z0-9_-]+$/.test(alias)) {
     return null;
@@ -399,6 +401,10 @@ function getAliasesForSession(sessionPath) {
  * @returns {object} Cleanup result
  */
 function cleanupAliases(sessionExists) {
+  if (typeof sessionExists !== 'function') {
+    return { totalChecked: 0, removed: 0, removedAliases: [], error: 'sessionExists must be a function' };
+  }
+
   const data = loadAliases();
   const removed = [];
 
@@ -409,8 +415,8 @@ function cleanupAliases(sessionExists) {
     }
   }
 
-  if (removed.length > 0) {
-    saveAliases(data);
+  if (removed.length > 0 && !saveAliases(data)) {
+    log('[Aliases] Failed to save after cleanup');
   }
 
   return {

scripts/lib/utils.js

@@ -34,13 +34,6 @@ function getSessionsDir() {
   return path.join(getClaudeDir(), 'sessions');
 }
 
-/**
- * Get the session aliases file path
- */
-function getAliasesPath() {
-  return path.join(getClaudeDir(), 'session-aliases.json');
-}
-
 /**
  * Get the learned skills directory
  */
@@ -447,7 +440,6 @@ module.exports = {
   getHomeDir,
   getClaudeDir,
   getSessionsDir,
-  getAliasesPath,
   getLearnedSkillsDir,
   getTempDir,
   ensureDir,