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>

internal/db/db_test.go

@@ -0,0 +1,44 @@
+package db
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func TestOpenAndMigrate(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "test.db")
+
+	database, err := Open(path)
+	if err != nil {
+		t.Fatalf("Open: %v", err)
+	}
+	defer database.Close()
+
+	if err := Migrate(database); err != nil {
+		t.Fatalf("Migrate: %v", err)
+	}
+
+	// Verify tables exist.
+	tables := []string{"seal_config", "barrier_entries", "schema_migrations"}
+	for _, table := range tables {
+		var name string
+		err := database.QueryRow(
+			"SELECT name FROM sqlite_master WHERE type='table' AND name=?", table).Scan(&name)
+		if err != nil {
+			t.Errorf("table %q not found: %v", table, err)
+		}
+	}
+
+	// Migration should be idempotent.
+	if err := Migrate(database); err != nil {
+		t.Fatalf("second Migrate: %v", err)
+	}
+
+	// Check migration version.
+	var version int
+	database.QueryRow("SELECT MAX(version) FROM schema_migrations").Scan(&version)
+	if version != 1 {
+		t.Errorf("migration version: got %d, want 1", version)
+	}
+}