feat(skill): a local worker with the coding agent of your choice

`spawn_worker <name> local` started the one agent the model was
installed with. The server now lists every agent the model can be run
with, so the skill passes the choice on:

- `local_model` adds `agents` (each with its status, whether it is the
  default, and the readiness mark the server measured) and `models`
  (what is on the Mac; only the active one runs). A new reason,
  `no-agent`: installed, but nothing that can run the model is there.
- `spawn_worker <name> local:<cli>` (`local:pi`, `local:deepseek`,
  `local:opencode`, `local:claude`, also as `name:local:pi` in
  `spawn_workers`) starts an agent whose status is `ready`. Anything
  else fails the spawn before a session exists and names the agents
  that are startable. No agent is ever installed from here: that stays
  a person's click in the window. A Codeman that lists no agents knows
  one, and only that one can be named.
- The readiness mark comes from the server when it names one, else from
  what this skill measured (OpenCode `┃`, Pi `extended-keys`), and
  `LOCAL_READY_MARK` overrides both.
- A Pi worker on the local model is started with
  `piConfig.approveProjectTrust: false` (--no-approve). On a custom
  model Pi keeps no home, so it asks to trust the folder in every
  session with Trust preselected, and the task prompt's Enter would
  answer that.

Pi's mark is the last line of its startup, a warning about tmux's
`extended-keys` option. Its composer rule is painted in the first frame,
before Pi takes Enter: a prompt sent at the rule stayed unsent, 2 of 2,
and one sent at the warning was submitted, 4 of 4 (pi 1.5.2, Linux). It
is a side effect, not a contract, so a Pi that stops printing it fails
the spawn and the worker is deleted, never handed back on a guess.

The preamble changed, so CODEMAN_PREAMBLE moves to 1.51.0 in the
preamble, the SKILL.md copy of it and every version check, and the
plugin mirror is synced.

Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

docs/local-models.md

@@ -329,10 +329,12 @@ The codeman skill ([`skills/codeman`](../skills/codeman/SKILL.md#claude-in-the-c
 lets an agent in a Codeman session hand work to this model, so Claude in the cloud plans and
 reviews while the model on this Mac does the bulk: summaries, classification, first drafts, and
 files that should not leave the machine. `local_model` reads `GET /api/local-model` and says what
-is installed or why nothing can run; `spawn_worker <name> local` starts the runtime when it was
-stopped (as Start does), then starts the default coding agent (`install.cli`) on `local-ollama` through the same
+is installed or why nothing can run, with the coding agents the model can be run with and the
+models on the Mac; `spawn_worker <name> local` starts the runtime when it was
+stopped (as Start does), then starts the default coding agent (`install.cli`), or with
+`local:<agent>` (`local:pi`, `local:deepseek`) another one that is ready, on `local-ollama` through the same
 quick-start launch and the same checks as above; `sendmark` gives the worker a task and reads its
-answer back from a file it writes in its own folder. The skill never installs a model and never
+answer back from a file it writes in its own folder. The skill never installs a model or a coding agent and never
 answers a confirmation, the runtime still answers one request at a time, and while a worker it
 opened is live, Stop and Remove are refused until it is closed.