release(v0.4.0): purge learnship, migrate .planning→.ci, fix backends, add test coverage

- Remove all learnship references: Decision.learnship_equivalent field,
  agent persona prompts, opencode.json permissions, test fixtures
- Migrate verification layers from .planning/ to .ci/: structural
  checks .ci/ dir + ROADMAP.md, behavioral checks ROADMAP.md
- Fix ollama-local: remove sync require+curl blocking, use async
  fetchAvailableModels() in callModel
- Fix opencode.json: use __OPENCODE_DIR__ template tokens, remove
  legacy learnship permission entries
- Remove duplicate install script from package.json (keep postinstall)
- Fix quality any-regex false positives (target type annotations only)
- Add backends test coverage: backends.test.ts, tool-registry.test.ts
- Version bump 0.3.0 → 0.4.0
- Artifacts module: rename .planning→.ci internal paths
- Remove dead TODO_PATTERN/FIXME_PATTERN constants

---ci---
phase: 3
milestone: v0.4
status: complete
requirements:
  covered: [REQ-09, REQ-10, REQ-11, REQ-13, REQ-14, REQ-17]
  partial: []
decisions:
  - id: D-001
    decision: purge all learnship references from codebase
    rationale: project is CI-only, learnship is no longer a dependency
    confidence: 0.99
    category: scope
    alternatives: [keep for historical reference]
  - id: D-002
    decision: migrate verification from .planning/ to .ci/ paths
    rationale: .planning/ is removed schema, all current state lives in .ci/
    confidence: 0.95
    category: architecture
    alternatives: [keep dual-path support]
  - id: D-003
    decision: use __OPENCODE_DIR__ template tokens in opencode.json
    rationale: hardcoded ~ paths fail in containers and non-standard homes
    confidence: 0.90
    category: implementation_approach
    alternatives: [keep tilde expansion]
---/ci---

src/core/artifacts.ts

@@ -2,7 +2,7 @@ import * as fs from "node:fs";
 import * as path from "node:path";
 import { writeFile, readFile, ensureDir } from "../utils/file.js";
 
-const PLANNING_DIR = ".planning";
+const CI_DIR = ".ci";
 
 export interface ProjectManifest {
   name: string;
@@ -48,18 +48,18 @@ export class ArtifactManager {
     this.projectPath = projectPath;
   }
 
-  private get planningDir(): string {
-    return path.join(this.projectPath, PLANNING_DIR);
+  private get ciDir(): string {
+    return path.join(this.projectPath, CI_DIR);
   }
 
   ensureStructure(): void {
-    ensureDir(this.planningDir);
-    ensureDir(path.join(this.planningDir, "phases"));
-    ensureDir(path.join(this.projectPath, ".ci", "audit"));
+    ensureDir(this.ciDir);
+    ensureDir(path.join(this.ciDir, "phases"));
+    ensureDir(path.join(this.ciDir, "audit"));
   }
 
   isInitialized(): boolean {
-    return fs.existsSync(path.join(this.planningDir, "PROJECT.md"));
+    return fs.existsSync(path.join(this.ciDir, "PROJECT.md"));
   }
 
   writeProject(manifest: ProjectManifest): void {
@@ -81,7 +81,7 @@ export class ArtifactManager {
     }
     lines.push("");
 
-    writeFile(path.join(this.planningDir, "PROJECT.md"), lines.join("\n"));
+    writeFile(path.join(this.ciDir, "PROJECT.md"), lines.join("\n"));
   }
 
   writeDecisions(decisions: DecisionsManifest): void {
@@ -99,11 +99,11 @@ export class ArtifactManager {
       lines.push(`- **Timestamp**: ${d.timestamp}`);
       lines.push("");
     }
-    writeFile(path.join(this.planningDir, "DECISIONS.md"), lines.join("\n"));
+    writeFile(path.join(this.ciDir, "DECISIONS.md"), lines.join("\n"));
   }
 
   writeState(state: StateManifest): void {
-    writeJSON(path.join(this.planningDir, "STATE.md.json"), state);
+    writeJSON(path.join(this.ciDir, "STATE.md.json"), state);
 
     const lines = [
       "# Project State",
@@ -124,11 +124,11 @@ export class ArtifactManager {
     }
     lines.push("");
 
-    writeFile(path.join(this.planningDir, "STATE.md"), lines.join("\n"));
+    writeFile(path.join(this.ciDir, "STATE.md"), lines.join("\n"));
   }
 
   readState(): StateManifest | null {
-    const filePath = path.join(this.planningDir, "STATE.md.json");
+    const filePath = path.join(this.ciDir, "STATE.md.json");
     if (!fs.existsSync(filePath)) return null;
     return JSON.parse(fs.readFileSync(filePath, "utf-8"));
   }
@@ -150,7 +150,7 @@ export class ArtifactManager {
     artifactName: string,
     content: string
   ): void {
-    const phaseDir = path.join(this.planningDir, "phases", `phase-${phase}`);
+    const phaseDir = path.join(this.ciDir, "phases", `phase-${phase}`);
     ensureDir(phaseDir);
     writeFile(path.join(phaseDir, artifactName), content);
   }
@@ -160,7 +160,7 @@ export class ArtifactManager {
     artifactName: string
   ): string | null {
     const filePath = path.join(
-      this.planningDir,
+      this.ciDir,
       "phases",
       `phase-${phase}`,
       artifactName