chore: scaffold M0 — repo structure, ADRs, dev environment, pre-merge checklist

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project are documented here.
+Format loosely follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/). Pre-1.0: minor versions may include breaking changes.
+
+## [Unreleased] — M0: Foundation
+
+### Added
+- Repository scaffold (structure per `docs/architecture/00-founding-strategy.md`, Section 4).
+- ADR-001: Backend language & framework (Python + FastAPI).
+- ADR-002: Docs → Qdrant sync strategy.
+- ADR-003: Deployment strategy (Coolify + Gitea webhook, CI deferred).
+- Local dev environment: Postgres, Qdrant, Redis via Docker Compose.
+- Manual pre-merge checklist (replaces CI for M0/M1).
+- Deployment topology doc (no staging yet).
+- Initial roadmap.