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The launcher becomes the spawn mechanism: a shell script runs the roster check, assigns the id, and launches with the helper instructions in order, where a model-followed startup instruction can skip a step. The in-session roster check stays as the safety net for raw launches and still splits a live anchor into crashed versus concurrent.
Session-end ordering was unhandled: a helper outliving the primary stranded a dirty worktree, since the helper may not commit and the agent allowed to is gone. The git ban on helpers is concurrency-scoped, so it lifts when the helper finds itself alone at wrap-up and the last agent out closes the door with the full wrap-up. The mirror case pauses too: a primary wrapping with live helpers stops at the commit and asks whether to sweep the helper's in-flight work, wait, or leave closing to the helper.
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A second agent now discovers concurrency itself instead of being told: a stateless process scan (running agent processes, /proc cwd matched within the project root, own ancestry excluded) runs as the first action of every session, before any pull. Alone with no anchor is a fresh session, alone with an anchor is today's crash recovery, and not-alone skips startup and routes to helper-mode.org, the role-contract workflow. The scan also splits the previously ambiguous live-anchor signal into crashed versus concurrent primary.
Verified the signal live with four concurrent agents on this machine. The ai --helper launcher flag drops from mechanism to convenience. Known v1 limits recorded: sessions not running as local processes are invisible to the scan, and the match is process-cwd based.
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Four loss windows the scoped-edit discipline doesn't cover: a primary file-wide hygiene pass silently clobbering a helper's concurrent edit (gate on live session-context.d/ files before any such pass), a new primary misreading helper dirt as leftover mess (surface live helper files at startup), crash recovery for shared-file edits (helpers journal each edit before applying it), and MEMORY.md's anchor-less read-modify-write index (memory writes stay primary-only).
Backstop: every file-wide pass snapshots to /tmp before modifying. lint-org and wrap-org-table already conform; todo-cleanup — the pass that moves whole subtrees — does not, and Phase 1.5 brings it up to the invariant.
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The v0 draft covered identity and message targeting for concurrent agents but not spawn mechanics or write-safety for the shared files the session-context split doesn't isolate. I added a section for the motivating case (a second Claude in one project doing lookups and safe task updates): ai --helper spawn with automatic AI_AGENT_ID, a tiered read/write contract where helpers make scoped single-heading org edits and file-wide passes plus all git mutation stay primary-only, light helper startup, and helper wrap-up. Phase 1.5 sequences the slice independently of the runtime-neutral phases 2-6.
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Moved three inbox notes into docs/design/ so the task body links survive: pearl's two pattern-catalog handoffs and codex's v0 generic-agent-runtime spec. Added two corresponding TODOs under Rulesets Open Work, both [#C].
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