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---

src/cli/commands.ts

@@ -1002,7 +1002,7 @@ function computeShipVersion(
   projectPath: string,
   phaseNum: number,
   config: CIAgentConfig
-): { tag: string; milestoneType: "nfr" | "feature" | "schema-breaking" } {
+): { tag: string; milestoneType: "nfr" | "feature" | "major" } {
   const tags = execSync("git tag -l", { cwd: projectPath, encoding: "utf-8" })
     .split("\n")
     .map((t) => t.trim())
@@ -1029,7 +1029,7 @@ function computeShipVersion(
   const milestoneType = inferMilestoneType(projectPath);
 
   let tag: string;
-  if (milestoneType === "schema-breaking") {
+  if (milestoneType === "major") {
     tag = `v${major}.${minor + phaseNum}.0`;
   } else {
     tag = `v${major}.${minor}.${phaseNum}`;
@@ -1038,10 +1038,10 @@ function computeShipVersion(
   return { tag, milestoneType };
 }
 
-function inferMilestoneType(projectPath: string): "nfr" | "feature" | "schema-breaking" {
+function inferMilestoneType(projectPath: string): "nfr" | "feature" | "major" {
   try {
     const log = execSync("git log --oneline -50", { cwd: projectPath, encoding: "utf-8" });
-    if (log.match(/\brefactor\b|\brewrite\b|\bmigrate\b|\brestructure\b/i)) return "schema-breaking";
+    if (log.match(/\brefactor\b|\brewrite\b|\bmigrate\b|\brestructure\b/i)) return "major";
     if (log.match(/\bfeat\b/)) return "feature";
     return "nfr";
   } catch {

src/core/ciagent-files.test.ts

@@ -329,7 +329,7 @@ describe("CIAgentFiles", () => {
       expect(ciFiles.getMilestoneType()).toBe("feature");
     });
 
-    it("returns schema-breaking when phases include refactor/rewrite/migrate", () => {
+    it("returns major when phases include refactor/rewrite/migrate", () => {
       const ciFiles = new CIAgentFiles(dir, "schema-proj");
       ciFiles.ensureProjectDir();
       fs.writeFileSync(path.join(dir, ".ciagent", "config.json"), JSON.stringify({
@@ -337,13 +337,13 @@ describe("CIAgentFiles", () => {
         active_project: "schema-proj",
       }));
       const roadmap: RoadmapMd = {
-        overview: "schema-breaking",
+        overview: "major",
         phases: [
           { number: 1, name: "refactor-core", description: "Refactor core", status: "in_progress", dependsOn: [], requirements: [], successCriteria: [] },
         ],
       };
       ciFiles.writeRoadmapMd(roadmap);
-      expect(ciFiles.getMilestoneType()).toBe("schema-breaking");
+      expect(ciFiles.getMilestoneType()).toBe("major");
     });
   });
 

src/core/ciagent-files.ts

@@ -486,7 +486,7 @@ export class CIAgentFiles {
       }
     }
 
-    if (hasSchemaBreak) return "schema-breaking";
+    if (hasSchemaBreak) return "major";
     if (hasFeature) return "feature";
     return "nfr";
   }

src/core/git-branch.test.ts

@@ -192,11 +192,11 @@ describe("GitBranch", () => {
       expect(tag).toBe("v0.6.0");
     });
 
-    it("computes next major for schema-breaking milestone", () => {
+    it("computes next major for major milestone", () => {
       execSync(`git tag -a v0.5.1 -m "v0.5.1"`, { cwd: repoDir, stdio: "pipe" });
 
       const gitBranch = new GitBranch(repoDir);
-      const tag = gitBranch.computeMilestoneTag("schema-breaking");
+      const tag = gitBranch.computeMilestoneTag("major");
       expect(tag).toBe("v1.0.0");
     });
 

src/core/git-branch.ts

@@ -242,7 +242,7 @@ export class GitBranch {
       }
     }
 
-    if (milestoneType === "schema-breaking") {
+    if (milestoneType === "major") {
       return `v${major + 1}.0.0`;
     }
 

src/core/git-context.test.ts

@@ -307,7 +307,7 @@ status: execute
       expect(ctx.getMilestoneType()).toBe("feature");
     });
 
-    it("returns schema-breaking when refactor commits exist", () => {
+    it("returns major when refactor commits exist", () => {
       commit(repoDir, `refactor(P01): rewrite core
 
 ---ci---
@@ -317,7 +317,7 @@ status: execute
 ---/ci---`);
 
       const ctx = new GitContext(repoDir);
-      expect(ctx.getMilestoneType()).toBe("schema-breaking");
+      expect(ctx.getMilestoneType()).toBe("major");
     });
   });
 });

src/core/git-context.ts

@@ -333,7 +333,7 @@ export class GitContext {
       if (!commit.ci) continue;
       hasAnyCiCommit = true;
       if (commit.type === "feat") return "feature";
-      if (commit.type === "refactor" || commit.scope === "init") return "schema-breaking";
+      if (commit.type === "refactor" || commit.scope === "init") return "major";
     }
     if (!hasAnyCiCommit) return "nfr";
     return "nfr";

src/types/config.ts

@@ -7,7 +7,7 @@ export type ModelProfile = "quality" | "speed" | "balanced";
 
 export type BranchingStrategy = "phase" | "feature" | "trunk";
 
-export type MilestoneType = "nfr" | "feature" | "schema-breaking";
+export type MilestoneType = "nfr" | "feature" | "major";
 
 export type PhaseName = "research" | "plan" | "execute" | "verify" | "complete";