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

PLAN.md

@@ -0,0 +1,39 @@
+# PLAN.md — PryScraper
+
+> Current sprint. 21-day cycles per ADR-0012.
+
+## Status
+current_sprint=2026-Q3-S1 · started=2026-07-01 · ends=2026-07-21
+
+## Sprint Goals
+1. _TODO: top 1-3 goals for this sprint_
+
+## In Progress
+- [ ] TODO: in-progress items
+
+## Backlog (this sprint)
+- [ ] TODO: planned items
+
+## Risks
+- TODO: anything blocking progress
+
+## Done (this sprint)
+- _None yet — sprint just started._
+
+## Carry-over from previous sprint
+- _None._
+
+---
+
+## Definition of Done
+- [ ] Code complete
+- [ ] Tests written (>80% coverage on changed lines)
+- [ ] Pre-commit hooks pass (ruff, mypy, gitleaks, bandit)
+- [ ] CI passes on forgejo
+- [ ] Conventional commit message
+- [ ] PR reviewed + merged
+- [ ] Deployed to staging
+- [ ] Smoke-tested in production
+- [ ] Observability in place (metrics, logs, alerts)
+- [ ] Docs updated (AGENTS.md, ARCHITECTURE.md, README.md)
+- [ ] STATUS.md updated