fix(qfs): project ui, config naming, sync timestamps - v1.5.4

bible-local/02-architecture.md

@@ -34,6 +34,7 @@ Readiness guard:
 - every sync push/pull runs a preflight check;
 - blocked sync returns `423 Locked` with a machine-readable reason;
 - local work continues even when sync is blocked.
+- sync metadata updates must preserve project `updated_at`; sync time belongs in `synced_at`, not in the user-facing last-modified timestamp.
 
 ## Pricing contract
 
@@ -55,6 +56,15 @@ Rules:
 - rename, reorder, project move, and similar operational edits do not create a new revision snapshot;
 - current revision pointer must be recoverable if legacy or damaged rows are found locally.
 
+## Naming collisions
+
+UI-driven rename and copy flows use one suffix convention for conflicts.
+
+Rules:
+- configuration and variant names must auto-resolve collisions with `_копия`, then `_копия2`, `_копия3`, and so on;
+- copy checkboxes and copy modals must prefill `_копия`, not ` (копия)`;
+- the literal variant name `main` is reserved and must not be allowed for non-main variants.
+
 ## Vendor BOM contract
 
 Vendor BOM is stored in `vendor_spec` on the configuration row.