feat(P01): interactive validation + doc updates + multi-project CLI — IDEATE-12,13,14 + MULTI-02,06

---ci---
phase: 1
milestone: v0.10
status: execute
decisions:
  - id: D-083
    decision: Interactive one-at-a-time validation with accept/skip/modify
    rationale: Gives user full control over ideation results
    confidence: 0.87
  - id: D-085
    decision: Ask-after-validation kickoff of run workflow
    rationale: Balances automation with user control
    confidence: 0.85
  - id: D-091
    decision: Full multi-project support with active_projects array + parallel execution
    rationale: User wants complete multi-project capability
    confidence: 0.85
requirements:
  covered:
    - IDEATE-12
    - IDEATE-13
    - IDEATE-14
    - MULTI-02
    - MULTI-06
---/ci---

- IDEATE-12: Interactive accept/skip/modify validation with readline
- IDEATE-13: acceptIdea/acceptIdeas methods update REQUIREMENTS.md and ROADMAP.md
- IDEATE-14: Ask-after-validation kickoff prompt for
- MULTI-02: --project flag accepts comma-separated or 'all' in pre-action hook
- MULTI-06: ciagent status shows active_projects and ideation config
- projects list shows all active projects with multi-marker
- projects set updates both active_project and active_projects

src/core/ideation.ts

@@ -846,4 +846,95 @@ export class IdeationEngine {
       },
     };
   }
+
+  acceptIdea(idea: Idea): { reqId: string; addedToRequirements: boolean; addedToRoadmap: boolean } {
+    const reqId = idea.id;
+    const reqs = this.ciFiles.readRequirementsMd();
+    const roadmap = this.ciFiles.readRoadmapMd();
+
+    let addedToRequirements = false;
+    let addedToRoadmap = false;
+
+    if (reqs) {
+      const categoryMap: Record<string, string> = {
+        security: "Security",
+        quality: "Quality",
+        architecture: "Architecture",
+        coverage: "Coverage",
+        improvement: "Improvement",
+        spec: "Specification",
+        chaos: "Resilience",
+      };
+
+      const categoryName = categoryMap[idea.category] || "Improvement";
+      let foundCategory = false;
+      for (const cat of reqs.v1) {
+        if (cat.category.toLowerCase() === categoryName.toLowerCase()) {
+          cat.items.push({ id: reqId, description: idea.title });
+          foundCategory = true;
+          break;
+        }
+      }
+      if (!foundCategory) {
+        reqs.v1.push({
+          category: categoryName,
+          items: [{ id: reqId, description: idea.title }],
+        });
+      }
+
+      reqs.traceability.push({
+        requirement: reqId,
+        phase: 0,
+        status: "pending",
+      });
+
+      this.ciFiles.writeRequirementsMd(reqs);
+      addedToRequirements = true;
+    }
+
+    if (roadmap) {
+      const lastPhase = roadmap.phases.length > 0
+        ? roadmap.phases[roadmap.phases.length - 1]
+        : null;
+
+      const nextPhaseNumber = lastPhase ? lastPhase.number + 1 : 1;
+      const phaseName = idea.category === "security" ? "security-hardening"
+        : idea.category === "architecture" ? "architecture-fix"
+        : idea.category === "coverage" ? "coverage-expansion"
+        : idea.category === "quality" ? "quality-improvement"
+        : idea.category === "spec" ? "spec-refinement"
+        : idea.category === "chaos" ? "resilience-hardening"
+        : "improvement";
+
+      roadmap.phases.push({
+        number: nextPhaseNumber,
+        name: phaseName,
+        description: idea.title,
+        status: "not_started",
+        dependsOn: lastPhase ? [lastPhase.number] : [],
+        requirements: [reqId],
+        successCriteria: [idea.rationale],
+      });
+
+      this.ciFiles.writeRoadmapMd(roadmap);
+      addedToRoadmap = true;
+    }
+
+    return { reqId, addedToRequirements, addedToRoadmap };
+  }
+
+  acceptIdeas(ideas: Idea[]): { accepted: Idea[]; results: Array<{ reqId: string; addedToRequirements: boolean; addedToRoadmap: boolean }> } {
+    const accepted: Idea[] = [];
+    const results: Array<{ reqId: string; addedToRequirements: boolean; addedToRoadmap: boolean }> = [];
+
+    for (const idea of ideas) {
+      const result = this.acceptIdea(idea);
+      if (result.addedToRequirements || result.addedToRoadmap) {
+        accepted.push(idea);
+        results.push(result);
+      }
+    }
+
+    return { accepted, results };
+  }
 }