Plan A: parallel MCP orchestration engine — coordination core - #5

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feat/parallel-mcp-orchestration-engine

Jul 25, 2026

Commits on Jul 23, 2026

docs(spec): parallel MCP orchestration engine design (3 critique rounds)
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docs(plan): Plan A — coordination core (spike gate + config + store + scheduler + budget)
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Commits on Jul 24, 2026

spike(engine): validate FastMCP multi-client streamable-HTTP (PASS, mcp==1.28.1)
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feat(engine): six-phase config source of truth + loader
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feat(engine): SQLite schema + typed ClaimResult
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test(engine): assert all 17 tasks columns in schema test
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feat(engine): pure scheduler (seeding, readiness, advance, model-resolution)
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test(engine): isolate advance seeded/empty guard + resolve_model edges
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feat(engine): store init, run seeding, versioned state CAS
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fix(engine): rollback-safe _txn helper for store mutations
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feat(engine): atomic claim, owner-guarded heartbeat, reaper
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feat(engine): single-tx complete_task, approval gates, fail/retry
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fix(engine): fail_task status guard, scheduler-driven reject re-ready, cap test
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feat(engine): budget downgrade_paths (authoritative) + downgrade_model_for; drop dead registry accessors
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refactor(engine): raise on invalid phases config + self-ref guard; minor cleanups
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