Implement Phase 1: core framework, operational tooling, and runbook

Core packages: crypto (Argon2id/AES-256-GCM), config (TOML/viper),
db (SQLite/migrations), barrier (encrypted storage), seal (state machine
with rate-limited unseal), auth (MCIAS integration with token cache),
policy (priority-based ACL engine), engine (interface + registry).

Server: HTTPS with TLS 1.2+, REST API, auth/admin middleware, htmx web UI
(init, unseal, login, dashboard pages).

CLI: cobra/viper subcommands (server, init, status, snapshot) with env
var override support (METACRYPT_ prefix).

Operational tooling: Dockerfile (multi-stage, non-root), docker-compose,
hardened systemd units (service + daily backup timer), install script,
backup script with retention pruning, production config examples.

Runbook covering installation, configuration, daily operations,
backup/restore, monitoring, troubleshooting, and security procedures.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Makefile

@@ -0,0 +1,24 @@
+.PHONY: build test vet clean docker all
+
+build:
+	go build ./...
+
+metacrypt:
+	go build -trimpath -ldflags="-s -w" -o metacrypt ./cmd/metacrypt
+
+test:
+	go test ./...
+
+vet:
+	go vet ./...
+
+clean:
+	rm -f metacrypt
+
+docker:
+	docker build -t metacrypt .
+
+docker-compose:
+	docker compose -f deploy/docker/docker-compose.yml up --build
+
+all: vet test metacrypt