fix(P01): quick wins — remove dead refs, unused imports, fix postinstall, version bump

---ci---
project: ci
phase: 1
milestone: v0.5
status: complete
decisions:
  - id: D-020
    decision: Phase 1 Quick Wins complete
    rationale: All 5 FIX requirements (FIX-01 through FIX-05) verified and passing
    confidence: 0.95
    alternatives: []
requirements:
  covered: [FIX-01, FIX-02, FIX-03, FIX-04, FIX-05]
---/ci---

Phase 1 (Quick Wins) summary:
- A1/FIX-01: Marked .planning/ refs as (legacy)/(removed) in docs
- A2/FIX-02: Removed unused execSync import from ollama-base.ts
- A3/FIX-03: Replaced postinstall with explicit install-opencode, removed scripts/ from files
- A4/FIX-04: Verified opencode.json is clean (no learnship entry)
- A5/FIX-05: Version bump to 0.5.0

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@continuous-intelligence/ci",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "description": "Fully autonomous AI-driven software engineering harness - Continuous Intelligence",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
@@ -10,7 +10,6 @@
   "files": [
     "dist/",
     "opencode/",
-    "scripts/",
     "templates/",
     "LICENSE",
     "README.md"
@@ -21,7 +20,7 @@
     "typecheck": "tsc --noEmit",
     "test": "jest",
     "prepublishOnly": "npm run build",
-    "postinstall": "node scripts/postinstall.js"
+    "install-opencode": "node scripts/postinstall.js"
   },
   "keywords": ["ci", "autonomous", "ai", "software-engineering", "agent", "multi-project"],
   "license": "MIT",