Merge pull request 'feat(P04): Cross-project pipeline integration — IDEATE-16, IDEATE-11, IDEATE-18' (#7) from phase/04-cross-project-pipeline into main

- Add ideation-agent to STAGE_AGENT_MAP for ideate stage
- Implement ideate case in executeStage() with mechanical ideation,
  config-aware category filtering, idea deduplication, auto-accept,
  and ---ci--- commit with decision block
- Add test verifying ideate position between research and plan in
  STAGE_ORDER
- 542 tests passing

src/agents/orchestrator.ts

@@ -47,6 +47,7 @@ export class OrchestratorAgent extends BaseAgent {
 
   private static readonly STAGE_AGENT_MAP: Partial<Record<PipelineStage, AgentName[]>> = {
     research: ["researcher"],
+    ideate: ["ideation-agent"],
     plan: ["planner"],
     execute: ["executor", "code-reviewer", "security-auditor"],
     test: ["tester"],
@@ -571,6 +572,64 @@ export class OrchestratorAgent extends BaseAgent {
         break;
       }
 
+      case "ideate": {
+        this.log("Running ideation stage...");
+        const { IdeationEngine } = await import("../core/ideation.js");
+        const ideationEngine = new IdeationEngine(context.project_path);
+        const ideas = ideationEngine.runMechanical();
+
+        const ideationConfig = this.config.ideation;
+        if (ideationConfig?.categories && ideationConfig.categories.length > 0) {
+          const categoryIdeas = ideationEngine.runMechanical(ideationConfig.categories);
+          const seenTitles = new Set(ideas.map((i) => i.title));
+          for (const idea of categoryIdeas) {
+            if (!seenTitles.has(idea.title)) {
+              ideas.push(idea);
+              seenTitles.add(idea.title);
+            }
+          }
+        }
+
+        ideas.sort((a, b) => b.confidence - a.confidence);
+
+        const maxIdeas = ideationConfig?.max_ideas || 20;
+        const trimmedIdeas = ideas.slice(0, maxIdeas);
+
+        if (this.config.git.auto_commit && this.gitContext!.isGitRepo()) {
+          const { accepted: savedIdeas, results } = ideationEngine.acceptIdeas(trimmedIdeas);
+          const savedCount = results.filter((r) => r.addedToRequirements || r.addedToRoadmap).length;
+
+          const ideationCommit = CommitBuilder.buildDecisionCommit({
+            phase: this.pipelineState!.current_phase,
+            milestone: this.currentMilestone,
+            subject: `ideation results — ${trimmedIdeas.length} total, ${savedCount} accepted`,
+            decisions: savedIdeas.map((idea) => ({
+              id: idea.id,
+              decision: idea.title,
+              rationale: idea.rationale,
+              confidence: idea.confidence,
+              alternatives: idea.actions,
+            })),
+          });
+
+          try {
+            execSync(`git add -A && git commit -m "${ideationCommit.replace(/"/g, '\\"')}" --allow-empty`, {
+              cwd: context.project_path,
+              stdio: "pipe",
+            });
+          } catch (err) {
+            this.warn(`Ideation commit failed: ${err instanceof Error ? err.message : String(err)}`);
+          }
+
+          artifactsCreated.push(".ciagent/REQUIREMENTS.md", ".ciagent/ROADMAP.md");
+          decisionsMade += savedCount;
+        }
+
+        this.pipelineState!.ideate_completed = true;
+        this.log(`Ideation stage complete: ${trimmedIdeas.length} ideas generated`);
+        break;
+      }
+
       case "plan":
         this.log("Planning phase execution...");
 

src/cli/commands.ts

@@ -169,6 +169,7 @@ export function createRunCommand(): Command {
     .option("--all", "Execute all remaining phases sequentially")
     .option("--phase <number>", "Phase number", "1")
     .option("--backend <provider>", "Override intelligence backend for this run")
+    .option("--ideate", "Insert ideation stage between research and plan")
     .action(async (phase, options) => {
       const projectPath = process.cwd();
 
@@ -177,6 +178,49 @@ export function createRunCommand(): Command {
         process.exit(1);
       }
 
+      if (options.ideate) {
+        console.log("─── CIAgent Ideate (pipeline mode) ───\n");
+
+        const ciFiles = new CIAgentFiles(projectPath);
+        const slug = ciFiles.getProjectSlug() || ciFiles.getActiveProject() || "default";
+        const { IdeationEngine } = await import("../core/ideation.js");
+        const engine = new IdeationEngine(projectPath, slug);
+
+        const ideas = engine.runMechanical();
+
+        const ideaCategory: IdeationCategory[] = options.category
+          ? options.category.split(",").map((c: string) => c.trim() as IdeationCategory)
+          : [];
+
+        if (ideaCategory.length > 0) {
+          const filtered = engine.runMechanical(ideaCategory);
+          ideas.push(...filtered);
+        }
+
+        const seen = new Set<string>();
+        const uniqueIdeas = ideas.filter((idea: Idea) => {
+          if (seen.has(idea.title)) return false;
+          seen.add(idea.title);
+          return true;
+        });
+
+        uniqueIdeas.sort((a: Idea, b: Idea) => b.confidence - a.confidence);
+
+        console.log(`Found ${uniqueIdeas.length} improvement ${uniqueIdeas.length === 1 ? "idea" : "ideas"} from ideation stage.\n`);
+
+        if (uniqueIdeas.length > 0) {
+          const { accepted: savedIdeas, results } = engine.acceptIdeas(uniqueIdeas);
+          const savedCount = results.filter((r: { addedToRequirements: boolean; addedToRoadmap: boolean }) => r.addedToRequirements || r.addedToRoadmap).length;
+
+          if (savedCount > 0) {
+            console.log(`${savedCount} idea${savedCount === 1 ? "" : "s"} added to REQUIREMENTS.md and ROADMAP.md.`);
+          }
+
+          const commitMsg = `decision(P${options.phase || 1}): ideation results — ${uniqueIdeas.length} total, ${savedCount} accepted`;
+          console.log(`\nCommit suggestion: ${commitMsg}`);
+        }
+      }
+
       const config = loadConfig(projectPath);
       const { backend, error: backendError } = await resolveBackendForCommand(config, options.backend);
 

src/core/ideation.test.ts

@@ -327,4 +327,60 @@ describe("IdeationEngine", () => {
       expect(titles.some((t) => t.includes("coverage"))).toBe(true);
     });
   });
+
+  describe("Phase 3: External signals and cascade impact", () => {
+    let tempDir: string;
+
+    beforeEach(() => {
+      resetIdeaCounter();
+      tempDir = fs.mkdtempSync(path.join(os.tmpdir(), "ciagent-p3-test-"));
+    });
+
+    afterEach(() => {
+      fs.rmSync(tempDir, { recursive: true, force: true });
+    });
+
+    it("runAffected detects cascade from architecture.md", () => {
+      const ciagentDir = path.join(tempDir, ".ciagent");
+      fs.mkdirSync(ciagentDir, { recursive: true });
+      fs.writeFileSync(
+        path.join(ciagentDir, "config.json"),
+        JSON.stringify({ projects: [], active_project: "default" })
+      );
+      fs.writeFileSync(
+        path.join(ciagentDir, "ARCHITECTURE.md"),
+        "# Architecture\n\n## Overview\n\nTest.\n\n## Components\n\n### CLI\n\n- **Description**: Command line interface\n- **Boundaries**: User-facing only\n- **Depends on**: Core\n\n### Core\n\n- **Description**: Core engine\n- **Boundaries**: Internal only\n- **Depends on**: None\n\n## Data Flow\n\nSimple.\n\n## Build Order\n\n1. CLI\n2. Core\n"
+      );
+
+      const engine = new IdeationEngine(tempDir);
+      const ideas = engine.runAffected();
+      expect(Array.isArray(ideas)).toBe(true);
+    });
+
+    it("runExternal handles missing npm gracefully", () => {
+      const ciagentDir = path.join(tempDir, ".ciagent");
+      fs.mkdirSync(ciagentDir, { recursive: true });
+      fs.writeFileSync(
+        path.join(ciagentDir, "config.json"),
+        JSON.stringify({ projects: [], active_project: "default" })
+      );
+
+      const engine = new IdeationEngine(tempDir);
+      const ideas = engine.runExternal();
+      expect(Array.isArray(ideas)).toBe(true);
+    });
+
+    it("runCrossProject returns empty when only one project", () => {
+      const ciagentDir = path.join(tempDir, ".ciagent");
+      fs.mkdirSync(ciagentDir, { recursive: true });
+      fs.writeFileSync(
+        path.join(ciagentDir, "config.json"),
+        JSON.stringify({ projects: [{ slug: "default", name: "Default Project", default: true }], active_project: "default" })
+      );
+
+      const engine = new IdeationEngine(tempDir, "default");
+      const ideas = engine.runCrossProject();
+      expect(ideas).toEqual([]);
+    });
+  });
 });

src/types/pipeline.test.ts

@@ -62,4 +62,14 @@ describe("createInitialPipelineState", () => {
     expect(state.started_at).toBeTruthy();
     expect(state.last_updated).toBeTruthy();
   });
+});
+
+describe("STAGE_ORDER ideate position", () => {
+  it("places ideate between research and plan", () => {
+    const ideateIdx = STAGE_ORDER.indexOf("ideate");
+    const researchIdx = STAGE_ORDER.indexOf("research");
+    const planIdx = STAGE_ORDER.indexOf("plan");
+    expect(ideateIdx).toBeGreaterThan(researchIdx);
+    expect(ideateIdx).toBeLessThan(planIdx);
+  });
 });