docs(agents): align Redis compose commands with development guide (#3288)

* docs(agents): align Redis compose commands with development guide

- Problem: AGENTS.md omitted Redis from dev infrastructure compose commands
  while docs/contributing/development.mdx starts redis for local dev.
- Fix: document full postgres/redis/seaweedfs compose command and note that
  REDIS_URL and ENCRYPTION_SECRET are required for AI agent features.
- Verification: preflight upstream fetch; manual diff against development.mdx
  and compose.dev.yml redis service; duplicate PR gate passed.

* docs(agents): clarify Redis development URLs

---------

Co-authored-by: Amruth Pillai <im.amruth@gmail.com>

AGENTS.md

@@ -115,6 +115,8 @@ Copy `.env.example` to `.env.local`. The three required variables are:
 
 S3/SeaweedFS is optional. If `S3_ACCESS_KEY_ID`, `S3_SECRET_ACCESS_KEY`, and `S3_BUCKET` are all set, the app uses S3-compatible storage. The checked-in `.env.example` sets SeaweedFS defaults, so either start the `seaweedfs` compose service too or comment out those S3 vars to use local filesystem storage under `<workspace>/data`. `LOCAL_STORAGE_PATH` must be absolute when set.
 
+`REDIS_URL` and `ENCRYPTION_SECRET` are optional for core resume flows, but both are required for saved AI providers and the authenticated `/agent` workspace. Start the `redis` compose service and set both vars in `.env.local` when working on those features. For host-run development, use `REDIS_URL=redis://localhost:6379`; the container-run app uses `REDIS_URL=redis://redis:6379`.
+
 When running dev servers or migration commands, prefix the command with `dotenvx run -f .env.local --`. For example: `dotenvx run -f .env.local -- pnpm dev`. Tests, typechecks, linters, boundary checks, and `pnpm build` do not need this prefix by default. If one of those commands fails because a specific environment variable is required, rerun it with the `dotenvx run -f .env.local --` prefix.
 
 ### Common commands
@@ -124,6 +126,7 @@ When running dev servers or migration commands, prefix the command with `dotenvx
 | Install deps | `pnpm install` |
 | Start Postgres only | `sudo docker compose -f compose.dev.yml up -d postgres` |
 | Start Postgres + SeaweedFS | `sudo docker compose -f compose.dev.yml up -d postgres seaweedfs seaweedfs_create_bucket` |
+| Start full dev infrastructure | `sudo docker compose -f compose.dev.yml up -d postgres redis seaweedfs seaweedfs_create_bucket` |
 | Generate migrations | `dotenvx run -f .env.local -- pnpm db:generate` |
 | Run migrations | `dotenvx run -f .env.local -- pnpm db:migrate` |
 | Dev server | `dotenvx run -f .env.local -- pnpm dev` (starts on port 3000) |