v0.1.6: sync 2026-10-03..10-15 core corpus — kanban practice fully retired (#5745), review-artifact schema validation wiring (#5656 N-04/N-06), review-code batching (#4386) + worktree codegraph preamble (#4187), gitea adapter slimming, roles yaml first-line fix (octopus main-repo commits 86047c51d..de16e8704)

core/schemas/reviewer-output.schema.json

@@ -31,6 +31,7 @@
     },
     "quantitative_summary": {
       "type": "object",
+      "description": "Every check the reviewer executed this round (PASS and FAIL counted in total_checks; NA reported via na_count). The verdict field must follow these counts per the thresholds documented on verdict — a synthesis consumer recalculates pass_rate from passed/total_checks and treats a mismatch as a malformed artifact.",
       "required": ["total_checks", "passed", "failed", "pass_rate"],
       "properties": {
         "total_checks": { "type": "integer", "minimum": 1 },
@@ -74,7 +75,8 @@
           },
           "severity": {
             "type": "string",
-            "enum": ["BLOCKER", "MAJOR", "MINOR", "INFO"]
+            "enum": ["BLOCKER", "MAJOR", "MINOR", "INFO"],
+            "description": "BLOCKER: breaks an acceptance criterion, hangs/leaks, or opens an abuse channel — the artifact must not land as-is. MAJOR: a real defect on a non-blocking path, or a test/lock blind to a plausible regression (a mutation would escape). MINOR: quality/drift issue with a cheap local fix (naming, duplication, small docs gap); no behavioral risk. INFO: observation, accepted-risk note, or follow-up ticket material — no action required this round. Calibration rule: severity grades the FINDING's impact, not the reviewer's confidence; low-confidence suspicions go to INFO with the evidence, never inflated to MAJOR."
           },
           "checklist_ref": {
             "type": "string",