fix(#976): detect command+args (wrapped) hook registrations in installer presence checks (#994)

* fix(#976): detect command+args (wrapped) hook registrations in installer presence checks

Add referencesHook() helper that inspects both h.command (standard form) and
h.args[] (args-form / wrapped-launcher form) when checking whether a managed
hook is already registered.  Rewrite all has*Hook predicates and the
alreadyHas* guards to use it so args-form registrations suppress the duplicate
stock string-command entry that was previously appended on every install/update.

Also add an explicit args-form skip to rewriteLegacyManagedNodeHookCommands so
entries with a non-empty args[] are left untouched (they are intentional user
wrappers, not legacy bare-node commands to migrate).

Extend isManagedHookCommand() in shell-command-projection.cts with an optional
args: unknown[] parameter that checks whether any arg's basename matches the
managed hook surface set — backward compatible; existing callers are unaffected.

Regression test added to tests/install-regressions.test.cjs:
- two-pass install with an args-form SessionStart entry pre-written to
  settings.local.json asserts exactly 1 hook entry remains after reinstall
  (previously 2 — the original args-form + a new stock string-command duplicate)
- rewriteLegacyManagedNodeHookCommands test asserts args-form entries unchanged

Closes #976

* chore(#976): backfill changeset pr number (994)

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

src/shell-command-projection.cts

@@ -219,12 +219,25 @@ function managedHookCommandSurfaceSet(surface: string = 'settings-json', include
   return new Set([...base, ...aliases]);
 }
 
-export function isManagedHookCommand(commandText: unknown, opts: { surface?: string; includeLegacyAliases?: boolean; configDir?: string } = {}): boolean {
+export function isManagedHookCommand(commandText: unknown, opts: { surface?: string; includeLegacyAliases?: boolean; configDir?: string; args?: unknown[] } = {}): boolean {
   if (typeof commandText !== 'string') return false;
   const surface = opts.surface || 'settings-json';
   const includeLegacyAliases = opts.includeLegacyAliases === true;
   const managedBasenames = managedHookCommandSurfaceSet(surface, includeLegacyAliases);
   if (!managedBasenames || managedBasenames.size === 0) return false;
+
+  // args-form check: the managed hook filename may appear in args[] rather than
+  // in command when a windowless launcher wraps the Node invocation. (#976)
+  // Only treat as managed when an arg basename matches the managed hook set —
+  // prevents false-positives for non-GSD entries that happen to share a path segment.
+  if (Array.isArray(opts.args) && opts.args.length > 0) {
+    for (const arg of opts.args) {
+      if (typeof arg !== 'string') continue;
+      const argBasename = arg.replace(/\\/g, '/').split('/').pop() || '';
+      if (isManagedHookBasename(argBasename, { surface })) return true;
+    }
+  }
+
   const normalizedCommand = commandText.replace(/\\/g, '/');
 
   if (typeof opts.configDir === 'string' && opts.configDir.length > 0) {