fix: scope Windows hook syntax to Gemini runtime (#3438)

* test: cover Windows hook shell drift for Claude (#3413)

* fix: scope Windows hook syntax to Gemini runtime (#3413)

* docs: add changeset for #3413

* docs: set changeset pr for #3413

* fix: route Windows hook formatting through runtime-aware projection seam

* test: cover runtime projection edge cases for Windows hooks

* fix(docs): add shell-command-projection to inventory parity

* docs: align CLI module shipped count after rebase

tests/bug-3413-shell-command-projection.test.cjs

@@ -0,0 +1,73 @@
+'use strict';
+
+process.env.GSD_TEST_MODE = '1';
+
+const { describe, test } = require('node:test');
+const assert = require('node:assert/strict');
+const path = require('node:path');
+
+const projection = require(path.join(__dirname, '..', 'get-shit-done', 'bin', 'lib', 'shell-command-projection.cjs'));
+const install = require(path.join(__dirname, '..', 'bin', 'install.js'));
+
+const { hookCommandNeedsPowerShellCallOperator, formatHookCommandForRuntime } = projection;
+const { buildHookCommand, rewriteLegacyManagedNodeHookCommands } = install;
+
+describe('bug #3413: Shell Command Projection Module uses runtime-aware hook policy', () => {
+  test('Gemini on Windows requires PowerShell call operator', () => {
+    assert.equal(
+      hookCommandNeedsPowerShellCallOperator({ platform: 'win32', runtime: 'gemini' }),
+      true,
+    );
+    assert.equal(
+      formatHookCommandForRuntime('"C:/node.exe" "C:/hook.js"', { platform: 'win32', runtime: 'gemini' }),
+      '& "C:/node.exe" "C:/hook.js"',
+    );
+  });
+
+  test('Claude on Windows stays shell-neutral', () => {
+    assert.equal(
+      hookCommandNeedsPowerShellCallOperator({ platform: 'win32', runtime: 'claude' }),
+      false,
+    );
+    assert.equal(
+      formatHookCommandForRuntime('"C:/node.exe" "C:/hook.js"', { platform: 'win32', runtime: 'claude' }),
+      '"C:/node.exe" "C:/hook.js"',
+    );
+  });
+
+  test('runtime omitted stays conservative (no PowerShell prefix)', () => {
+    assert.equal(
+      formatHookCommandForRuntime('"C:/node.exe" "C:/hook.js"', { platform: 'win32' }),
+      '"C:/node.exe" "C:/hook.js"',
+    );
+  });
+});
+
+describe('bug #3413: installer hook surfaces consume runtime-aware projection', () => {
+  test('buildHookCommand emits shell-neutral Claude hook command on Windows', () => {
+    const cmd = buildHookCommand('C:/Users/me/.claude', 'gsd-check-update.js', {
+      platform: 'win32',
+      runtime: 'claude',
+    });
+    assert.equal(cmd.startsWith('& '), false, `Claude hook command must not use PowerShell prefix: ${cmd}`);
+  });
+
+  test('rewriteLegacyManagedNodeHookCommands removes stale PowerShell prefix for Claude on Windows', () => {
+    const settings = {
+      hooks: {
+        SessionStart: [{
+          hooks: [{ type: 'command', command: '& "/usr/local/bin/node" "C:/Users/me/.claude/hooks/gsd-check-update.js"' }],
+        }],
+      },
+    };
+    const changed = rewriteLegacyManagedNodeHookCommands(settings, '"/usr/local/bin/node"', {
+      platform: 'win32',
+      runtime: 'claude',
+    });
+    assert.equal(changed, true);
+    assert.equal(
+      settings.hooks.SessionStart[0].hooks[0].command,
+      '"/usr/local/bin/node" "C:/Users/me/.claude/hooks/gsd-check-update.js"',
+    );
+  });
+});