feat(worktree): onboard creator by default in worktree_prepare.sh (Issue #68)

.agents/skills/multi-agent-mux-create/SKILL.md

@@ -202,15 +202,15 @@ Run from the control root's skills tree (lib.sh's `WORKSPACE_ROOT` = the main ch
 ```bash
 bash .agents/skills/multi-agent-mux-create/scripts/worktree_prepare.sh \
   --path ../multi-agent-mux-wt/issue-42 --branch fix/issue-42 [--base <ref>] [--submodules] \
-  [--creator-agent claude [--session <name>] [--role creator] [--herdr-session <s>] [--herdr-workspace <w>] [--onboard]] [--dry-run]
+  [--creator-agent claude [--session <name>] [--role creator] [--herdr-session <s>] [--herdr-workspace <w>] [--no-onboard]] [--dry-run]
 ```
 
 - Creates the worktree next to the control root (a path **inside** it is refused), idempotently; creates the worktree's **own** `.venv` from the control root's `.venv/bin/python` and installs the delegate-job skill's `requirements.txt` (paho-mqtt, PyYAML - what `deploy/install.sh` installs) plus `requirements.txt` / `requirements-dev.txt` when present (needs network access to the package index; a failed install removes the half-made venv and exits 1 so a re-run starts over; never a link - a leftover link is refused with exit 1; no control-root interpreter is a warning and `VENV=skipped`); adds `/.venv` and `.pytest_cache/` to the shared `info/exclude` (a linked worktree's exclude file is `$GIT_COMMON_DIR/info/exclude`, so it applies to the main checkout too).
 - **Submodules are opt-in** (`--submodules`). Initialisation writes `submodule.<name>.url` to the shared `.git/config`, and any attempt - even a failed one - leaves a `modules/` directory that makes a plain `git worktree remove` refuse. A failed `--submodules` undoes only what that attempt created - new submodule checkouts are deinitialised before their git dirs are deleted, so the worktree stays a usable checkout; submodules initialised earlier and pre-existing `submodule.*` values are kept - and exits 1; re-run without `--submodules` to finish.
-- `--creator-agent` creates the creator through this skill with the control root's binding and `MAM_NO_SUBSCRIBER_DAEMON=1`; the row's `pane.cwd` is the worktree.
+- `--creator-agent` creates the creator through this skill with the control root's binding and `MAM_NO_SUBSCRIBER_DAEMON=1` (the row's `pane.cwd` is the worktree) and onboards it (the onboarding job is sent; `--no-onboard` skips it, `--onboard` is the default and still accepted).
 - Prints `BASE=<sha>`: record it **before** delegating the implementation, then review with `run_loop.sh --worktree <WT> --base "$BASE" --review-only`.
 - A submodule path that is not initialised yet but already holds files refuses `--submodules` up front (exit 3, nothing changed): the clone would fail on it and a rollback could not tell those files from its own.
-- Exit codes: 0 ok, 1 git / submodule / create failure, 2 usage or path rule, 3 refused to protect existing content (nothing changed); 44/45 are create's (onboarding error / timeout with `--onboard`; session and worktree kept).
+- Exit codes: 0 ok, 1 git / submodule / create failure, 2 usage or path rule, 3 refused to protect existing content (nothing changed); 44/45 are create's (onboarding error / timeout; onboarding is the default, `--no-onboard` skips it; session and worktree kept).
 - create itself: a control-plane binding that cannot be computed is refused (exit 2) for a `--workspace` other than the control root and warned about for the control root; the immediate reconcile and the watchdog run the control root's code.
 
 ## Pitfalls