diff --git a/internal/cmd/root.go b/internal/cmd/root.go
index c3997a1..ca16cff 100644
--- a/internal/cmd/root.go
+++ b/internal/cmd/root.go
@@ -58,6 +58,7 @@ func NewRootCommand() *cobra.Command {
 		newGuardrailCmd(),
 		newLedgerCmd(),
 		newSpineCmd(),
+		newScmCmd(),
 		newEnrichmentCmd(),
 		newAgentSuiteCmd(),
 		newPlaceholderCmd("ask", "Agent assist: explain or inspect without mutating state"),
diff --git a/internal/cmd/scm.go b/internal/cmd/scm.go
new file mode 100644
index 0000000..eb81aa5
--- /dev/null
+++ b/internal/cmd/scm.go
@@ -0,0 +1,169 @@
+package cmd
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os"
+	"os/exec"
+	"strings"
+	"time"
+
+	"github.com/spf13/cobra"
+)
+
+// prophet scm — GitHub <-> Gitea sovereignty. The estate declared Gitea canonical and cut the
+// pull-mirror, but the workflow never moved: GitHub holds the real state, Gitea is a frozen orphan.
+// This surface makes the cutover clean — validate parity before flipping, dual-write during the
+// transition — and changes no remotes on its own. Config via env: GITEA_URL, GITEA_TOKEN, ORG.
+
+func scmEnv() (url, token, org string) {
+	url = strings.TrimRight(os.Getenv("GITEA_URL"), "/")
+	token = os.Getenv("GITEA_TOKEN")
+	org = os.Getenv("ORG")
+	if org == "" {
+		org = "SocioProphet"
+	}
+	return
+}
+
+func scmRun(name string, args ...string) (string, error) {
+	out, err := exec.Command(name, args...).Output()
+	return strings.TrimSpace(string(out)), err
+}
+
+func scmCurrentRepo() string {
+	if r, err := scmRun("gh", "repo", "view", "--json", "nameWithOwner", "-q", ".nameWithOwner"); err == nil && r != "" {
+		return r
+	}
+	if u, err := scmRun("git", "config", "--get", "remote.origin.url"); err == nil {
+		u = strings.TrimSuffix(u, ".git")
+		if i := strings.LastIndex(u, "github.com"); i >= 0 {
+			return strings.Trim(u[i+len("github.com"):], ":/")
+		}
+	}
+	return ""
+}
+
+func scmGithubHead(repo string) string {
+	s, _ := scmRun("gh", "api", "repos/"+repo+"/commits/main", "-q", ".sha")
+	if len(s) > 12 {
+		s = s[:12]
+	}
+	return s
+}
+
+func scmGiteaHead(url, token, repo string) (string, string) {
+	if token == "" || url == "" {
+		return "", "unauth"
+	}
+	req, err := http.NewRequest("GET", url+"/api/v1/repos/"+repo+"/branches/main", nil)
+	if err != nil {
+		return "", "error"
+	}
+	req.Header.Set("Authorization", "token "+token)
+	resp, err := (&http.Client{Timeout: 8 * time.Second}).Do(req)
+	if err != nil {
+		return "", "error"
+	}
+	defer resp.Body.Close()
+	switch {
+	case resp.StatusCode == 404:
+		return "", "missing"
+	case resp.StatusCode != 200:
+		return "", fmt.Sprintf("http%d", resp.StatusCode)
+	}
+	var d struct {
+		Commit struct {
+			ID string `json:"id"`
+		} `json:"commit"`
+	}
+	if json.NewDecoder(resp.Body).Decode(&d) != nil {
+		return "", "error"
+	}
+	id := d.Commit.ID
+	if len(id) > 12 {
+		id = id[:12]
+	}
+	return id, "ok"
+}
+
+func scmDrift(repoFlag string) error {
+	url, token, _ := scmEnv()
+	repo := repoFlag
+	if repo == "" {
+		repo = scmCurrentRepo()
+	}
+	if repo == "" {
+		return fmt.Errorf("not in a recognizable repo; pass --repo OWNER/NAME")
+	}
+	gh := scmGithubHead(repo)
+	gt, status := scmGiteaHead(url, token, repo)
+	verdict := "unknown"
+	switch {
+	case status == "ok" && gt != "" && gh == gt:
+		verdict = "in_sync"
+	case status == "ok" && gt != "":
+		verdict = "drifted"
+	case status == "missing":
+		verdict = "gitea_missing"
+	}
+	_ = emit(map[string]any{
+		"command": "prophet scm drift", "repo": repo,
+		"github": gh, "gitea": gt, "gitea_status": status, "verdict": verdict,
+	})
+	switch verdict {
+	case "drifted":
+		return fmt.Errorf("DRIFTED — GitHub is ahead of the canonical Gitea; reconcile before flipping")
+	case "unknown":
+		return fmt.Errorf("UNKNOWN — Gitea unreadable (set GITEA_TOKEN); treat as NOT clean")
+	}
+	return nil
+}
+
+func newScmCmd() *cobra.Command {
+	cmd := &cobra.Command{Use: "scm", Short: "GitHub<->Gitea sovereignty: validate drift, dual-write, prepare the cutover"}
+
+	var repoFlag string
+	drift := &cobra.Command{
+		Use:   "drift",
+		Short: "Compare GitHub vs Gitea HEAD — is the 'canonical' Gitea actually in sync?",
+		RunE:  func(c *cobra.Command, args []string) error { return scmDrift(repoFlag) },
+	}
+	drift.Flags().StringVar(&repoFlag, "repo", "", "OWNER/NAME (default: current repo)")
+
+	var branchFlag string
+	sync := &cobra.Command{
+		Use:   "sync",
+		Short: "Dual-write: push the current branch to GitHub AND Gitea",
+		RunE: func(c *cobra.Command, args []string) error {
+			br := branchFlag
+			if br == "" {
+				br, _ = scmRun("git", "branch", "--show-current")
+			}
+			if br == "" {
+				return fmt.Errorf("detached HEAD — checkout a branch first")
+			}
+			if _, err := scmRun("git", "push", "origin", br); err != nil {
+				return fmt.Errorf("github push failed: %w", err)
+			}
+			remotes, _ := scmRun("git", "remote")
+			if strings.Contains(remotes, "gitea") {
+				_, _ = scmRun("git", "push", "gitea", br)
+				return emit(map[string]any{"command": "prophet scm sync", "branch": br, "pushed": []string{"origin", "gitea"}})
+			}
+			return emit(map[string]any{"command": "prophet scm sync", "branch": br,
+				"pushed": []string{"origin"}, "note": "no 'gitea' remote — add it to dual-write"})
+		},
+	}
+	sync.Flags().StringVar(&branchFlag, "branch", "", "branch to push (default: current)")
+
+	status := &cobra.Command{
+		Use:   "status",
+		Short: "Backend + drift summary",
+		RunE:  func(c *cobra.Command, args []string) error { return scmDrift(repoFlag) },
+	}
+
+	cmd.AddCommand(drift, sync, status)
+	return cmd
+}