UI: password change enforcement + migration recovery

- Web UI admin password reset now enforces admin role
  server-side (was cookie-auth + CSRF only; any logged-in
  user could previously reset any account's password)
- Added self-service password change UI at GET/PUT /profile:
  current_password + new_password + confirm_password;
  server-side equality check; lockout + Argon2id verification;
  revokes all other sessions on success
- password_change_form.html fragment and profile.html page
- Nav bar actor name now links to /profile
- policy: ActionChangePassword + default rule -7 allowing
  human accounts to change their own password
- openapi.yaml: built-in rules count updated to -7

Migration recovery:
- mciasdb schema force --version N: new subcommand to clear
  dirty migration state without running SQL (break-glass)
- schema subcommands bypass auto-migration on open so the
  tool stays usable when the database is dirty
- Migrate(): shim no longer overrides schema_migrations
  when it already has an entry; duplicate-column error on
  the latest migration is force-cleaned and treated as
  success (handles columns added outside the runner)

Security:
- Admin role is now validated in handleAdminResetPassword
  before any DB access; non-admin receives 403
- handleSelfChangePassword follows identical lockout +
  constant-time Argon2id path as the REST self-service
  handler; current password required to prevent
  token-theft account takeover

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/ui/ui.go

@@ -191,6 +191,7 @@ func New(database *db.DB, cfg *config.Config, priv ed25519.PrivateKey, pub ed255
 		"templates/fragments/policy_row.html",
 		"templates/fragments/policy_form.html",
 		"templates/fragments/password_reset_form.html",
+		"templates/fragments/password_change_form.html",
 	}
 	base, err := template.New("").Funcs(funcMap).ParseFS(web.TemplateFS, sharedFiles...)
 	if err != nil {
@@ -208,6 +209,7 @@ func New(database *db.DB, cfg *config.Config, priv ed25519.PrivateKey, pub ed255
 		"audit_detail":   "templates/audit_detail.html",
 		"policies":       "templates/policies.html",
 		"pgcreds":        "templates/pgcreds.html",
+		"profile":        "templates/profile.html",
 	}
 	tmpls := make(map[string]*template.Template, len(pageFiles))
 	for name, file := range pageFiles {
@@ -296,6 +298,10 @@ func (u *UIServer) Register(mux *http.ServeMux) {
 	uiMux.Handle("PUT /accounts/{id}/tags", admin(u.handleSetAccountTags))
 	uiMux.Handle("PUT /accounts/{id}/password", admin(u.handleAdminResetPassword))
 
+	// Profile routes — accessible to any authenticated user (not admin-only).
+	uiMux.Handle("GET /profile", adminGet(u.handleProfilePage))
+	uiMux.Handle("PUT /profile/password", auth(u.requireCSRF(http.HandlerFunc(u.handleSelfChangePassword))))
+
 	// Mount the wrapped UI mux on the parent mux. The "/" pattern acts as a
 	// catch-all for all UI paths; the more-specific /v1/ API patterns registered
 	// on the parent mux continue to take precedence per Go's routing rules.
@@ -611,6 +617,11 @@ type PoliciesData struct {
 	AllActions []string
 }
 
+// ProfileData is the view model for the profile/settings page.
+type ProfileData struct {
+	PageData
+}
+
 // PGCredsData is the view model for the "My PG Credentials" list page.
 // It shows all pg_credentials sets accessible to the currently logged-in user:
 // those they own and those they have been granted access to.