fix(P03): honest execution — real rollback, honest orchestrator, git-native verification

---ci---
project: ci
phase: 3
milestone: v0.5
status: complete
decisions:
  - id: D-026
    decision: Phase 3 Honest Execution complete
    rationale: All HONEST requirements covered; no more fake success returns
    confidence: 0.95
    alternatives: []
requirements:
  covered: [HONEST-01, HONEST-02, HONEST-03]
---/ci---

src/agents/orchestrator.ts

@@ -224,7 +224,8 @@ export class OrchestratorAgent extends BaseAgent {
                 cwd: context.project_path,
                 stdio: "pipe",
               });
-            } catch {
+            } catch (err) {
+              this.warn(`Specify commit failed: ${err instanceof Error ? err.message : String(err)}`);
             }
           }
         } else {
@@ -275,6 +276,21 @@ export class OrchestratorAgent extends BaseAgent {
         this.log("Researching project domain...");
         this.decisionEngine!.setPhase(1);
 
+        const archMd = this.ciFiles!.readArchitectureMd();
+        if (!archMd) {
+          this.log("No ARCHITECTURE.md found — mechanical research cannot proceed without backend");
+          return {
+            phase: this.pipelineState!.current_phase,
+            stage: "research",
+            success: false,
+            artifacts_created: artifactsCreated,
+            decisions_made: decisionsMade,
+            escalations_raised: escalationsRaised,
+            duration_ms: Date.now() - stageStart,
+            error: "Research stage requires intelligence backend or existing ARCHITECTURE.md",
+          };
+        }
+
         if (this.config.git.auto_commit && this.gitContext!.isGitRepo()) {
           const researchCommit = CommitBuilder.buildResearchCommit(
             1,
@@ -288,7 +304,8 @@ export class OrchestratorAgent extends BaseAgent {
               cwd: context.project_path,
               stdio: "pipe",
             });
-          } catch {
+          } catch (err) {
+            this.warn(`Research commit failed: ${err instanceof Error ? err.message : String(err)}`);
           }
         }
 
@@ -309,11 +326,42 @@ export class OrchestratorAgent extends BaseAgent {
 
       case "execute":
         this.log("Executing implementation...");
+        if (!context.backend) {
+          this.log("No backend available — mechanical execution cannot implement code changes");
+          return {
+            phase: this.pipelineState!.current_phase,
+            stage: "execute",
+            success: false,
+            artifacts_created: artifactsCreated,
+            decisions_made: decisionsMade,
+            escalations_raised: escalationsRaised,
+            duration_ms: Date.now() - stageStart,
+            error: "Execute stage requires intelligence backend for code implementation",
+          };
+        }
         this.pipelineState!.execute_completed = true;
         break;
 
       case "verify": {
         this.log("Running verification...");
+
+        const { VerificationPipeline } = await import("../verification/index.js");
+        const verification = new VerificationPipeline(context.project_path);
+        const verifyResult = await verification.run(this.pipelineState!.current_phase || 1);
+
+        if (!verifyResult.all_passed) {
+          return {
+            phase: this.pipelineState!.current_phase,
+            stage: "verify",
+            success: false,
+            artifacts_created: artifactsCreated,
+            decisions_made: decisionsMade,
+            escalations_raised: escalationsRaised,
+            duration_ms: Date.now() - stageStart,
+            error: `Verification failed: ${verifyResult.escalations_needed.join("; ")}`,
+          };
+        }
+
         this.pipelineState!.verify_completed = true;
 
         if (this.config.git.auto_commit && this.gitContext!.isGitRepo()) {
@@ -329,7 +377,8 @@ export class OrchestratorAgent extends BaseAgent {
               cwd: context.project_path,
               stdio: "pipe",
             });
-          } catch {
+          } catch (err) {
+            this.warn(`Verify commit failed: ${err instanceof Error ? err.message : String(err)}`);
           }
         }
 
@@ -354,7 +403,8 @@ export class OrchestratorAgent extends BaseAgent {
               cwd: context.project_path,
               stdio: "pipe",
             });
-          } catch {
+          } catch (err) {
+            this.warn(`Completion commit failed: ${err instanceof Error ? err.message : String(err)}`);
           }
         }