refactor(P06): rename milestone type schema-breaking → major, reinforce release flow

---ci---
phase: 6
milestone: v0.10
status: execute
decisions:
  - id: D-001
    decision: Rename MilestoneType schema-breaking to major for clarity
    rationale: Major better describes the semver impact (major version bump) and aligns with standard semver terminology
    confidence: 0.95
    alternatives: [schema-breaking, breaking, major-change]
  - id: D-002
    decision: Add autopilot rules, PR+QA gates, and merge validation to ship workflow
    rationale: Release flow was documented but not enforced in the workflow. Zero-HITL rules, branch hierarchy validation, and coreci packaging steps ensure consistent releases
    confidence: 0.90
    alternatives: [keep-as-documentation-only, add-to-AGENTS.md-only]
---/ci---

opencode/command/ci-ship.md

@@ -1,5 +1,5 @@
 ---
-description: Ship CIAgent phase or milestone — test, commit, tag, push, release. Full autopilot: zero HITL after milestone setup
+description: Ship CIAgent phase or milestone — Full autopilot release: validate, test, merge, tag, push, release. Zero HITL
 argument-hint: "[phase_number|milestone]"
 tools:
   read: true
@@ -12,7 +12,7 @@ tools:
 ---
 
 <execution_context>
-@__OPENCODE_DIR__/ci/workflows/ship.md
+@/root/.config/opencode/ci/workflows/ship.md
 </execution_context>
 
 <context>