Writes a project's unattended build-loop prompt — `prompts/autonomous-build-loop.md`, the file a dynamic `/loop` re-reads every iteration to plan, implement and verify TaskTracker phases on its own, under a zero-error phase gate, with a human-only queue and a per-phase cost ledger. Detects everything it can (repo, visibility, stack, gate and CI commands, docs and ADRs, memory, lessons, the TaskTracker project with its phases), asks only what it can't (owner, decision precedence, sibling repos, production, standing authority, human-only work, machine quirks), creates the human-queue and cost-ledger phases only if they're missing, optionally installs the bundled token-usage…
