Stage 7 (wip): docs bake + stage renumber (insert UI Stage 8, shift +1)

- PLAN.md: new Stage 8 (UI social/account/history); Telegram->9, Admin->10, Linking->11, Polish->12; tracker + Stage 7 refinements; split the Stage 6 'wired in Stage 7' note between 7 and 8
- ARCHITECTURE: promote ui to current (slice scope, board-replay, codegen, theming, mock)
- FUNCTIONAL(+ru): client-app section with the Stage 7/8 split
- README + ui/README + CLAUDE.md: UI build/run/test, codegen, pnpm notes
- bumped Stage 8-11 refs (+1) across docs and code comments

backend/internal/account/email.go

@@ -33,7 +33,7 @@ var (
 	// ErrInvalidEmail is returned for an unparseable email address.
 	ErrInvalidEmail = errors.New("account: invalid email address")
 	// ErrEmailTaken is returned when the email is already confirmed by another
-	// account; binding it would be a merge, which Stage 10 owns.
+	// account; binding it would be a merge, which Stage 11 owns.
 	ErrEmailTaken = errors.New("account: email already confirmed by another account")
 	// ErrAlreadyConfirmed is returned when the email is already confirmed by the
 	// requesting account.
@@ -52,7 +52,7 @@ var (
 // Mailer and verifies it, binding a confirmed email identity to the requesting
 // account. Only the SHA-256 hash of a code is stored (never the plaintext),
 // matching the session model. Binding an email already confirmed by a different
-// account is refused (ErrEmailTaken) — merging two accounts is Stage 10 — and
+// account is refused (ErrEmailTaken) — merging two accounts is Stage 11 — and
 // using an email as a login is Stage 6, which reuses this mechanism.
 type EmailService struct {
 	store  *Store

backend/internal/game/types.go

@@ -15,7 +15,7 @@ const (
 	StatusFinished = "finished"
 )
 
-// ComplaintStatus values; Stage 9 owns the resolution lifecycle, Stage 3 only
+// ComplaintStatus values; Stage 10 owns the resolution lifecycle, Stage 3 only
 // ever writes StatusComplaintOpen.
 const StatusComplaintOpen = "open"
 
@@ -176,7 +176,7 @@ type RobotTurn struct {
 	Seed          int64
 }
 
-// Complaint is a word-check complaint awaiting admin review (Stage 9).
+// Complaint is a word-check complaint awaiting admin review (Stage 10).
 type Complaint struct {
 	ID            uuid.UUID
 	ComplainantID uuid.UUID

backend/internal/server/handlers_admin.go

@@ -9,7 +9,7 @@ import (
 // The /api/v1/admin/* endpoints are reached through the gateway's Basic-Auth
 // reverse proxy (docs/ARCHITECTURE.md §12). The backend trusts the gateway to
 // have authenticated the operator; the admin surface itself (complaint review,
-// dictionary versions) lands in Stage 9. handleAdminPing is the proxy target that
+// dictionary versions) lands in Stage 10. handleAdminPing is the proxy target that
 // proves the path end to end until then.
 func (s *Server) handleAdminPing(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"status": "ok"})