feat(tools): add Google Docs, Drive, and Tasks read-only tools

Add three new Google service integrations following the established
Gmail/GCal pattern:

- Google Docs (docs.list, docs.search, docs.read): list, search, and
  read document content as plain text via Docs + Drive APIs
- Google Drive (drive.list, drive.search, drive.read): list, search,
  and read files with export support for Workspace files (Docs→text,
  Sheets→CSV, Slides→text)
- Google Tasks (tasks.lists, tasks.list): list task lists and tasks
  with status, due dates, and notes

Each service has its own config section, OAuth auth command, tool
policy group, and test suite (53 new tests). The setup wizard now
offers to configure all Google services together and run OAuth auth
flows automatically after saving config.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/config/schema.ts

@@ -174,11 +174,32 @@ const gcalSchema = z.object({
   calendar_ids: z.array(z.string()).default(['primary']),
 }).optional();
 
+const gdocsSchema = z.object({
+  enabled: z.boolean().default(false),
+  credentials_file: z.string().optional(),
+  token_file: z.string().default('~/.config/flynn/gdocs-token.json'),
+}).optional();
+
+const gdriveSchema = z.object({
+  enabled: z.boolean().default(false),
+  credentials_file: z.string().optional(),
+  token_file: z.string().default('~/.config/flynn/gdrive-token.json'),
+}).optional();
+
+const gtasksSchema = z.object({
+  enabled: z.boolean().default(false),
+  credentials_file: z.string().optional(),
+  token_file: z.string().default('~/.config/flynn/gtasks-token.json'),
+}).optional();
+
 const automationSchema = z.object({
   cron: z.array(cronJobSchema).default([]),
   webhooks: z.array(webhookSchema).default([]),
   gmail: gmailSchema,
   gcal: gcalSchema,
+  gdocs: gdocsSchema,
+  gdrive: gdriveSchema,
+  gtasks: gtasksSchema,
   heartbeat: heartbeatSchema,
 }).default({});
 
@@ -417,5 +438,8 @@ export type HeartbeatCheck = z.infer<typeof heartbeatCheckSchema>;
 export type EmbeddingConfig = z.infer<typeof embeddingSchema>;
 export type EmbeddingProvider = z.infer<typeof embeddingProviderSchema>;
 export type GcalConfig = z.infer<typeof gcalSchema>;
+export type GdocsConfig = z.infer<typeof gdocsSchema>;
+export type GdriveConfig = z.infer<typeof gdriveSchema>;
+export type GtasksConfig = z.infer<typeof gtasksSchema>;
 export type PairingCodeConfig = z.infer<typeof pairingSchema>;
 export type LogLevel = z.infer<typeof logLevelSchema>;