fix(config): allow intel.enabled in config-set whitelist (#2021)

`intel.enabled` is the documented opt-in for the intel subsystem
(see commands/gsd/intel.md and docs/CONFIGURATION.md), but it was
missing from VALID_CONFIG_KEYS in config.cjs, so the canonical
command failed:

  $ gsd-tools config-set intel.enabled true
  Error: Unknown config key: "intel.enabled"

Add the key to the whitelist, document it under a new "Intel Fields"
section in planning-config.md alongside the other namespaced fields,
and cover it with a config-set test.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

get-shit-done/bin/lib/config.cjs

@@ -36,6 +36,7 @@ const VALID_CONFIG_KEYS = new Set([
   'project_code', 'phase_naming',
   'manager.flags.discuss', 'manager.flags.plan', 'manager.flags.execute',
   'response_language',
+  'intel.enabled',
 ]);
 
 /**

get-shit-done/references/planning-config.md

@@ -310,6 +310,14 @@ Set via `learnings.*` namespace (e.g., `"learnings": { "max_inject": 5 }`). Used
 |-----|------|---------|----------------|-------------|
 | `learnings.max_inject` | number | `10` | Any positive integer | Maximum number of global learning entries to inject into agent prompts per session |
 
+### Intel Fields
+
+Set via `intel.*` namespace (e.g., `"intel": { "enabled": true }`). Controls the queryable codebase intelligence system consumed by `/gsd-intel`.
+
+| Key | Type | Default | Allowed Values | Description |
+|-----|------|---------|----------------|-------------|
+| `intel.enabled` | boolean | `false` | `true`, `false` | Enable queryable codebase intelligence system. When `true`, `/gsd-intel` commands build and query a JSON index in `.planning/intel/`. |
+
 ### Manager Fields
 
 Set via `manager.*` namespace (e.g., `"manager": { "flags": { "discuss": "--auto" } }`).

tests/config.test.cjs

@@ -252,6 +252,16 @@ describe('config-set command', () => {
     assert.strictEqual(config.git.base_branch, 'master');
   });
 
+  test('sets intel.enabled to opt into the intel subsystem', () => {
+    writeConfig(tmpDir, {});
+
+    const result = runGsdTools('config-set intel.enabled true', tmpDir);
+    assert.ok(result.success, `Command failed: ${result.error}`);
+
+    const config = readConfig(tmpDir);
+    assert.strictEqual(config.intel.enabled, true);
+  });
+
   test('errors when no key path provided', () => {
     const result = runGsdTools('config-set', tmpDir);
     assert.strictEqual(result.success, false);