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>

deploy/examples/metacrypt-docker.toml

@@ -0,0 +1,22 @@
+# Metacrypt configuration for Docker deployment.
+# Place this file at /data/metacrypt.toml inside the container volume.
+
+[server]
+listen_addr = ":8443"
+tls_cert = "/data/certs/server.crt"
+tls_key  = "/data/certs/server.key"
+
+[database]
+path = "/data/metacrypt.db"
+
+[mcias]
+server_url = "https://mcias.metacircular.net:8443"
+# ca_cert = "/data/certs/mcias-ca.crt"
+
+[seal]
+# argon2_time    = 3
+# argon2_memory  = 131072
+# argon2_threads = 4
+
+[log]
+level = "info"