[shipmill-romamo]

Turns on shipmill's agent-autonomy upgrade: .github/shipmill.toml gets an [autonomy] table with triage = "act", fix = "act" and land = "act", made with shipmill upgrade --apply agent-autonomy and nothing else.

• What it changes: [autonomy] sets triage, fix, and land, the stages agent sessions run, to the levels they have today (land acts, since the [agents] prompt says "merge when green")
• Why: the levels move from the prompt's words, which nothing checks, to checked keys; the next minor release of shipmill stops reading the prompt, and an absent key then takes its default (spec 040), which would make land propose and stop the gate merging green PRs
• To turn it off later: set each key to "observe", "propose", or "act" in [autonomy]

Setting [autonomy] upgrade = "act" once would take every future config upgrade without a question; this PR doesn't set it.

No changelog fragment: a config-only change with no effect on Cloudfall's users, as in #108.

Accepted by @romamo in #111

Closes #111

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