fix: resolve all CI test failures (19 fixes across 6 files) (#519)

- canonical-session: fall back to JSON file recording when the loaded
  state-store module has no writer methods (factory vs instance)
- install-executor: skip node_modules and .git dirs in listFilesRecursive
  to prevent ETIMEDOUT copying thousands of .opencode dependency files
- ecc.js: increase maxBuffer to 10MB for spawned subcommands to prevent
  ENOBUFS on large install plan JSON output
- install-apply.test: update Cursor and Antigravity path assertions to
  match flattened rule layout and remapped dirs (workflows, skills)
- ecc.test: increase maxBuffer in test runner to handle large output
- orchestrate-codex-worker.sh: guard against unreadable task file before
  cat, write failure status and handoff artifacts on early exit

scripts/lib/install-executor.js

@@ -83,6 +83,11 @@ function validateLegacyTarget(target) {
   }
 }
 
+const IGNORED_DIRECTORY_NAMES = new Set([
+  'node_modules',
+  '.git',
+]);
+
 function listFilesRecursive(dirPath) {
   if (!fs.existsSync(dirPath)) {
     return [];
@@ -94,6 +99,9 @@ function listFilesRecursive(dirPath) {
   for (const entry of entries) {
     const absolutePath = path.join(dirPath, entry.name);
     if (entry.isDirectory()) {
+      if (IGNORED_DIRECTORY_NAMES.has(entry.name)) {
+        continue;
+      }
       const childFiles = listFilesRecursive(absolutePath);
       for (const childFile of childFiles) {
         files.push(path.join(entry.name, childFile));