feat(ci): v0.9.0 — Distribution & Expansion milestone complete

---ci---
project: ci
phase: 6
milestone: v0.9
status: complete
artifacts:
  tags: [v0.9.0]
decisions:
  - id: D-047
    decision: v0.9 theme = Distribution & Expansion
    rationale: npm publish + OpenAI/Anthropic backends + agent flesh + parallel execution
    confidence: 0.92
  - id: D-049
    decision: Feature milestone — patch tags v0.8.1-v0.8.6 then v0.9.0
    rationale: OpenAI backend, agent flesh, npm publish all feat
    confidence: 0.95
  - id: D-059
    decision: Rename OllamaBaseBackend to LLMBaseBackend + thin OllamaBaseBackend subclass
    rationale: 15 of 17 methods backend-agnostic
    confidence: 0.92
  - id: D-060
    decision: OpenAI/Anthropic backends use native fetch() not SDK packages
    rationale: No dependency bloat; fetch native in Node 18+
    confidence: 0.85
  - id: D-066
    decision: Concurrency limiter internal (no p-limit dependency)
    rationale: 15 lines; avoids dependency for trivial feature
    confidence: 0.90
  - id: D-067
    decision: Promise.allSettled for review agents at orchestrator lines 373-400
    rationale: Current sequential loop replaced with parallel execution
    confidence: 0.88
requirements:
  covered: [PUBLISH-01, PUBLISH-02, PUBLISH-03, PUBLISH-04, OPENAI-01, OPENAI-02, OPENAI-03, OPENAI-04, OPENAI-05, FLESH-01, FLESH-02, FLESH-03, FLESH-04, FLESH-05, ANTHROPIC-01, ANTHROPIC-02, FLESH-06, FLESH-07, NPM-01, NPM-02, PARALLEL-01, PARALLEL-02, PARALLEL-03, INTEG-01, INTEG-02, INTEG-03, INTEG-04, INTEG-05]
---/ci---

6 phases, 28 tasks, 4077 net lines added, 57 test suites, 527 tests, zero stub agents

src/agents/plan-checker.ts

@@ -1,5 +1,16 @@
+import * as fs from "node:fs";
+import * as path from "node:path";
 import { BaseAgent, AgentContext, AgentResult } from "./base.js";
 
+interface PlanCheckResult {
+  type: "missing_section" | "task_id_gap" | "missing_must_haves" | "wave_order_invalid" | "uncovered_requirement";
+  severity: "P0" | "P1" | "P2";
+  description: string;
+  taskId?: string;
+}
+
+const REQUIRED_SECTIONS = ["# Phase", "## Phase Goal", "## Plans"];
+
 export class PlanCheckerAgent extends BaseAgent {
   readonly name = "plan-checker";
   readonly description = "Verifies plan quality. On ISSUES FOUND, triggers automatic plan revision (up to 3 iterations).";
@@ -8,6 +19,7 @@ export class PlanCheckerAgent extends BaseAgent {
   async execute(context: AgentContext): Promise<AgentResult> {
     const start = Date.now();
     this.log("Checking plan quality...");
+
     if (context.backend) {
       const result = await this.executeViaBackend(
         context,
@@ -15,14 +27,151 @@ export class PlanCheckerAgent extends BaseAgent {
       );
       return { ...result, duration_ms: Date.now() - start };
     }
+
+    const planPath = path.join(context.project_path, ".ciagent", "PLAN.md");
+    let planContent = "";
+    if (fs.existsSync(planPath)) {
+      planContent = fs.readFileSync(planPath, "utf-8");
+    }
+
+    const results = this.mechanicalPlanCheck(context.project_path, planContent);
+    const p0Count = results.filter((r) => r.severity === "P0").length;
+    const output = this.formatResults(results);
+
     return {
-      success: false,
-      output: "Plan checking requires an intelligence backend.",
+      success: p0Count === 0,
+      output,
       artifacts_created: [],
       decisions: 0,
-      escalations: 0,
+      escalations: p0Count,
       duration_ms: Date.now() - start,
-      error: "No intelligence backend available",
+      error: p0Count > 0 ? `${p0Count} P0 issue(s) found` : undefined,
     };
   }
+
+  mechanicalPlanCheck(projectPath: string, planContent: string): PlanCheckResult[] {
+    const results: PlanCheckResult[] = [];
+
+    this.checkStructure(planContent, results);
+    this.checkTaskIds(planContent, results);
+    this.checkMustHavesPresent(planContent, results);
+    this.checkWaveOrdering(planContent, results);
+    this.checkRequirementCoverage(projectPath, planContent, results);
+
+    return results;
+  }
+
+  checkStructure(planContent: string, results: PlanCheckResult[]): void {
+    for (const section of REQUIRED_SECTIONS) {
+      if (!planContent.includes(section)) {
+        results.push({
+          type: "missing_section",
+          severity: "P0",
+          description: `Plan is missing required section: ${section}`,
+        });
+      }
+    }
+  }
+
+  checkTaskIds(planContent: string, results: PlanCheckResult[]): void {
+    const taskIdRegex = /###?\s+Task\s+[\d.]+[:\s]+T?([\d.]+)/gi;
+    const ids: number[] = [];
+    let match;
+    while ((match = taskIdRegex.exec(planContent)) !== null) {
+      const idParts = match[1].split(".");
+      const taskId = parseInt(idParts[idParts.length - 1], 10);
+      if (!isNaN(taskId)) ids.push(taskId);
+    }
+
+    if (ids.length === 0) return;
+
+    for (let i = 1; i <= Math.max(...ids); i++) {
+      if (!ids.includes(i)) {
+        results.push({
+          type: "task_id_gap",
+          severity: "P1",
+          description: `Task ID gap: missing Task ${i}`,
+          taskId: `T${i}`,
+        });
+      }
+    }
+  }
+
+  checkMustHavesPresent(planContent: string, results: PlanCheckResult[]): void {
+    const taskRegex = /###?\s+Task[^]*?(?=###?\s+Task|$)/g;
+    const taskBlocks = planContent.match(taskRegex) || [];
+
+    for (const block of taskBlocks) {
+      const headerMatch = block.match(/###?\s+Task\s+([\d.]+)/);
+      if (!headerMatch) continue;
+      const taskId = headerMatch[1];
+      const hasMustHaves = /must.haves|acceptance.criteria|must.?have/i.test(block);
+      if (!hasMustHaves) {
+        results.push({
+          type: "missing_must_haves",
+          severity: "P1",
+          description: `Task ${taskId} is missing must-haves/acceptance criteria`,
+          taskId,
+        });
+      }
+    }
+  }
+
+  checkWaveOrdering(planContent: string, results: PlanCheckResult[]): void {
+    const waveRegex = /##?\s+Wave\s+(\d+)/gi;
+    const waves: number[] = [];
+    let match;
+    while ((match = waveRegex.exec(planContent)) !== null) {
+      waves.push(parseInt(match[1], 10));
+    }
+
+    for (let i = 1; i < waves.length; i++) {
+      if (waves[i] < waves[i - 1]) {
+        results.push({
+          type: "wave_order_invalid",
+          severity: "P0",
+          description: `Wave ordering invalid: Wave ${waves[i]} appears after Wave ${waves[i - 1]}`,
+        });
+      }
+    }
+  }
+
+  checkRequirementCoverage(projectPath: string, planContent: string, results: PlanCheckResult[]): void {
+    const reqPath = path.join(projectPath, ".ciagent", "REQUIREMENTS.md");
+    if (!fs.existsSync(reqPath)) return;
+
+    const reqContent = fs.readFileSync(reqPath, "utf-8");
+    const reqIdRegex = /REQ-(\d+)/g;
+    const requirements = new Set<string>();
+    let reqMatch;
+    while ((reqMatch = reqIdRegex.exec(reqContent)) !== null) {
+      requirements.add(`REQ-${reqMatch[1]}`);
+    }
+
+    const planReqIdRegex = /REQ-(\d+)/g;
+    const coveredReqs = new Set<string>();
+    let planMatch;
+    while ((planMatch = planReqIdRegex.exec(planContent)) !== null) {
+      coveredReqs.add(`REQ-${planMatch[1]}`);
+    }
+
+    for (const req of requirements) {
+      if (!coveredReqs.has(req)) {
+        results.push({
+          type: "uncovered_requirement",
+          severity: "P2",
+          description: `Requirement ${req} not covered in plan`,
+        });
+      }
+    }
+  }
+
+  private formatResults(results: PlanCheckResult[]): string {
+    if (results.length === 0) return "Plan check passed — no issues found.";
+    const lines: string[] = ["Plan Check Results:", ""];
+    for (const r of results) {
+      lines.push(`[${r.type}|${r.severity}] ${r.description}${r.taskId ? ` (task: ${r.taskId})` : ""}`);
+    }
+    return lines.join("\n");
+  }
 }