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7 phases (init -> 10 parallel cluster dispatches -> 17 synthesis sections -> 3 side artifacts -> self-review -> user review -> register). Each phase has explicit task IDs (t1_1 .. t7_4) for Tier 2 to walk through. current_phase = 0 (spec approved, not started). Hard rule encoded in [meta]: docs/artifacts/Fable System Prompt.txt is NEVER committed.