feat(shell-projection): centralize managed hook command policy (#3450)

* feat(shell-projection): route persistent PATH hints through projection seam

* refactor(shell-projection): unify managed hook command policy

* fix(install): guard malformed settings hooks during uninstall

* chore(changeset): add fragment for pr 3450

* fix(install): guard malformed settings hook entries

tests/install-path-detection.test.cjs

@@ -17,6 +17,14 @@ const os = require('os');
 const path = require('path');
 
 const INSTALL_PATH = path.join(__dirname, '..', 'bin', 'install.js');
+const PROJECTION_PATH = path.join(
+  __dirname,
+  '..',
+  'get-shit-done',
+  'bin',
+  'lib',
+  'shell-command-projection.cjs',
+);
 
 function loadInstaller() {
   process.env.GSD_TEST_MODE = '1';
@@ -34,8 +42,10 @@ function cleanup(dir) {
 
 describe('installer HOME-relative PATH detection (#2620)', () => {
   let installer;
+  let projection;
   before(() => {
     installer = loadInstaller();
+    projection = require(PROJECTION_PATH);
   });
 
   test('homePathCoveredByRc is exported', () => {
@@ -257,10 +267,23 @@ describe('installer HOME-relative PATH detection (#2620)', () => {
       }
 
       const joined = logs.join('\n');
-      assert.ok(
-        /echo 'export PATH=/.test(joined),
-        `installer should emit absolute export suggestion when rc does not cover globalBin; got:\n${joined}`,
+      assert.equal(
+        typeof projection.projectPersistentPathExportActions,
+        'function',
+        'shell command projection module must export projectPersistentPathExportActions',
       );
+      const projected = projection.projectPersistentPathExportActions({
+        targetDir: globalBin,
+        platform: process.platform,
+      });
+      assert.ok(Array.isArray(projected.shellActions), 'projected.shellActions must be an array');
+      assert.ok(projected.shellActions.length >= 2, 'expected at least zsh/bash projected actions');
+      for (const action of projected.shellActions) {
+        assert.ok(
+          joined.includes(action.command),
+          `installer should render projected command "${action.command}". Output:\n${joined}`,
+        );
+      }
     } finally {
       cleanup(home);
     }