senior-dev: plain folders start again, and shell model names resolve

[AbirAbbas]

Follow-up to #1488. Two senior-dev defects a real-model run of the merged build (dev dd0fcc654) found.

What was wrong

• A plain folder (no git) crashed before its first model call. codeaf senior-dev --dir <plain folder> … exited 2 at bootstrap with read start-time ignore list: open …/ignored-at-start: no such file or directory, and the chat road's run worker hit the same thing. Folder preparation returned on the plain road (and the gitignored-subfolder road) before writing the start-time ignore list, while both roads still handed its path to the child. This came from senior-dev: a coding agent built into codeaf takes a whole task, in the folder itself #1488's review fixes, after the plain-folder road had last been checked.
• --high needed the service prefix on the shell road. --high z-ai/glm-5.3-flash failed after launch with models.dev: provider "z-ai" not found; only openrouter/z-ai/glm-5.3-flash worked.

What changed

• Folder preparation writes an empty, readable ignore list before returning on the plain road. A repository's list is written and honoured as before, and an unreadable list still refuses eager commits.
• The shell resolves --high and --asked through the same model matcher and connected-service check the chat's proposals use, and hands the child the qualified id. A bare OpenRouter id, a service-prefixed id and a short crew word all work. A model no connected service can serve is refused before the child starts, naming /crew and codeaf connect. The manual says what --high accepts.

How it was checked

• New tests start the real senior-dev child in a plain folder on the shell road and as the chat's run worker, and run the shell parse path with bare, prefixed and short model words against a local model stub. Each failed on dd0fcc654 first.
• Real model (OpenRouter, z-ai/glm-5.3-flash, about $0.002):
  • Plain folder with a bare model id: exit 0, worked in place, committed nothing. Its own verification ran the project's 2 tests, and they pass when rerun independently.
  • Git repo with a bare model id: exit 0. The work sits on its checked-out task branch with main unchanged and a clean tree. The commit carries the run's identity, no .pyc files were committed, and the tests pass when rerun.
• Build, vet, the six-platform cross-build, make test-laws, the manual gates and the env-pin law all pass. The change entry is included.

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