afx decisions init: one command to turn on the Decisions tab #1840

Problem

There is no way for an adopter to say "I want to use decisions". Turning the loop on today means finding section 4 of resources/decision-protocol.md (which an adopter cannot see in their repo until #1834 lands), copying its template into codev/state/pending-decisions.md by hand, and then knowing to tell the main architect to route asks through it. Nothing creates the file, and nothing prompts the architect.

Fix (AIR, design decided)

afx decisions init [--path <file>]

• Writes the decisions file template and prints the path, that the Decisions tab appears within a few seconds, and the one sentence to tell the architect: "Route every ask for my word through the decisions file."
• Target path: --path if given, else dashboard.decisionsFile from config, else codev/state/pending-decisions.md. Relative to the workspace root; refused if it resolves outside the workspace (same rule the tab applies).
• Refuses, with a clear message, if the file already exists. No --force: an existing file holds the owner's rulings.
• Creates codev/state/ if missing.

Template as code, doc pinned to it. The template text lives in one place in the decisions server module (e.g. servers/decisions/template.ts) and is what the command writes. decision-protocol-doc.test.ts asserts section 4's fenced template in the doc equals that constant, so the two cannot drift. The template is the one #1837 ships: title line, the rule-inline line, _Zone: UTC_, _Status: 0 open._, ## Open, ## Ruled.

Architect role, one sentence (both trees, keep the section at its current length): when the owner asks to use decisions, run afx decisions init and follow the doc.

Docs. The Decisions tab section of resources/commands/agent-farm.md (both trees) opens with the command as the way to turn the tab on. Section 4 of the protocol doc names the command above its template.

Testing

• Unit tests for the command: creates the file with the template; refuses an existing file; honours --path and dashboard.decisionsFile; refuses a path outside the workspace.
• Doc test: section 4 template equals the code constant.
• Live check: run it in a workspace with the Tower running and confirm the tab appears without a reload.

Origin: owner's question on 2026-10-19, "how does someone say I want to use decisions?". Wanted before v3.3.6 publishes.