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t27mcp: Wave 2 milestone chain -- milestone_link, integrity, metrics specs - #13570
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…ty, metrics) Adds 3 new specs under specs/t27mcp/: - milestone_link.t27: MilestoneChainRecord field schema + chain_record_complete predicate - milestone_integrity.t27: orphan/chain-linked/control-surface predicates + Wave 1 audit fixtures - milestone_metrics.t27: coverage_pct metric + Wave 1 baseline (0%) + Wave 3 target (33%) Wave 1 audit (2026-11-10): 2 existing milestones (EPOCH-01-HARDEN #1, Phase 3 Science #2), both 0 open issues, 0 chain IDs -- folders, not control surfaces. Closes #13569 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Adds 3 new
.t27specs underspecs/t27mcp/for integrating GitHub milestonesinto the Golden Chain as a read-only control surface.
Summary
milestone_link.t27: MilestoneChainRecord field schema (request_id, chain_id, memory_record_id), chain_record_complete predicate, Wave 1 audit fixtures (MS1=EPOCH-01-HARDEN, MS2=Phase 3 Science)milestone_integrity.t27: is_orphan, is_chain_linked, is_control_surface predicates; both audit milestones confirmed as not control surfaces (have issues but no chain IDs)milestone_metrics.t27: coverage_pct metric; Wave 1 baseline=0%, Wave 3 target=33% (1 of 3 milestones linked)Wave 1 audit result: 2 existing milestones, 0 chain-linked -- folders, not control surfaces.
Wave 3: Milestone T27_MCP_RUNTIME_M0 (#3) created and linked to issues 13556, 13558, 13560, 13566, 13569.
Test plan
Closes #13569
🤖 Generated with Claude Code
Note
Low Risk
Spec-only additions with tests and invariants; no production code, auth, or external bindings.
Overview
Adds three new
.t27specs underspecs/t27mcp/to model GitHub milestones as a read-only Golden Chain control surface, mirroring the existing chain link/integrity/metrics pattern.milestone_link.t27definesMilestoneChainRecordfield indices, chain-link status codes (UNLINKED/PARTIAL/COMPLETE), Wave 1 audit milestone IDs (1–2) plus plannedMS_T27MCP_RUNTIME(#3) and linked issue constants, and achain_record_completepredicate.milestone_integrity.t27adds predicatesis_orphan,is_chain_linked, andis_control_surface, with tests anchored to the Wave 1 audit (two milestones with issues but no chain IDs—not orphans by the zero-issue rule, and not control surfaces).milestone_metrics.t27introduces metric IDs,coverage_pct, Wave 1 baseline (0% with 0/2 linked), and Wave 3 targets (33% with 1/3 linked), plusis_improving.All three close #13569 and are exercised via tests and invariants only—no runtime or
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