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Renn F
e209e285b8
True two-dev parallelism: a cell PM delegates the FULL set of code units up front — each dev gets its own queue, both build at the same time, each works its queue one task at a time in order. Replaces the old ceiling (≤2 code subtasks per parent, one per dev) which structurally forced under-decomposition. - Cap: `code` removed from `_SPINE_TYPE_CAPS` — no per-parent code cap (total fan-out still bounded by `_SUBTASK_HARD_CAP=12`); `planning`/`documentation` stay sequential at 1. `_same_assignee_rejection` exempts `code` so a dev may own a queue, but still rejects an exact same-title duplicate (the accidental re-delegation bug). `_spine_type_dup_envelope` simplified to the sequential spine it now only serves. - Dispatch barrier: `_blocked_by_earlier_lane_sibling` holds a dev's higher-sequence pending code leaf while it still has an earlier non-terminal code sibling under the same parent (keyed on assignee, gates only code) — the dev works its queue in order. Wired into `_spawn_pending_dev`. Loop-free (skip the tick, no reject/respawn) and best-effort (lookup failure → dispatch), mirroring the existing merge barrier. The merge barrier is unchanged: leaf PRs still merge serially in sequence order into the shared cell branch, so the independent build lanes never wedge it. - Prompt: cell_pm role guidance rewritten from the two-subtask-cap model to the per-dev-queue model (delegate all units now; dependent units go in one dev's queue, upstream first). Independent per-dev queues (each lane advances at its own pace) rather than strict cross-dev wave-sync, by design — more parallel and leaves the wedge-prone merge barrier untouched. Pairs with the spec-2 idle coverage gate: removing the code cap lets a PM claim every criterion up front, so that gate is always satisfiable.