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>

.gitignore

@@ -0,0 +1,27 @@
+# Binary (root only, not cmd/metacrypt/)
+/metacrypt
+/metacrypt.exe
+
+# Database
+*.db
+*.db-wal
+*.db-shm
+
+# Backups
+backup.db
+
+# TLS certs (never commit real certs)
+certs/
+
+# Config with real values (root only, not examples/)
+/metacrypt.toml
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*~
+
+# OS
+.DS_Store
+Thumbs.db