docs: apply fleet-template (16-artifact scaffold)

Adds missing standard artifacts:
- README.md (if missing)
- AGENTS.md (AI agent contract)
- PLAN.md (current sprint)
- STATUS.md (where we are)
- DEVELOPMENT.md (dev workflow)
- DEPLOYMENT.md (deploy procedure)
- TESTING.md (test strategy)
- DECISIONS.md (ADR index + templates)
- .github/CODEOWNERS
- .github/workflows/ci.yml

Preserves all existing artifacts.

Refs: RugMunchMedia/fleet-template

.github/CODEOWNERS

@@ -0,0 +1,15 @@
+# Default owners
+*       @crmuncher
+
+# Standards + fleet (slower review)
+/AGENTS.md       @crmuncher
+/ARCHITECTURE.md @crmuncher
+/README.md       @crmuncher
+/STATUS.md       @crmuncher
+/PLAN.md         @crmuncher
+/ROADMAP.md      @crmuncher
+/DECISIONS.md    @crmuncher
+
+# Sensitive paths
+/.secrets/       @crmuncher
+/backend/chain_vault/  @crmuncher

.github/workflows/ci.yml

@@ -0,0 +1,49 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - run: pip install ruff
+      - run: ruff check .
+      - run: ruff format --check .
+
+  typecheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - run: pip install mypy httpx trafilatura lxml markdownify pydantic pyyaml pandas
+      - run: mypy --python-version 3.12 --strict --ignore-missing-imports --exclude 'build/|dist/|.git/|__pycache__/' *.py
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - run: pip install pytest pytest-asyncio pytest-cov httpx trafilatura lxml markdownify pydantic pyyaml pandas
+      - run: pytest tests/ -v --cov=. --cov-report=term-missing
+
+  security:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - run: pip install bandit
+      - run: bandit -r . -x tests/,.venv,__pycache__