Remove unused service protocol aliases and use direct service imports

Docs/Tasks.md

@@ -224,6 +224,10 @@ Reference: `Docs/Refactoring.md` for full analysis of each issue.
 
 **Goal:** Make a deliberate decision and enforce it consistently. Option A: adopt the protocol injection pattern everywhere — update all 16 non-compliant routers to accept their service via the typed `Dep` alias. Option B: acknowledge the pattern is unused overhead and remove the protocol aliases and `cast()` wrappers from `dependencies.py`, letting all routers import concrete services directly (the current de facto standard). Option B is cheaper; Option A makes service substitution in tests easier.
 
+**Decision:** Option B applied — service protocol aliases and provider wrappers have been removed in favor of direct concrete service imports.
+
+**Status:** Completed ✅
+
 **Possible traps and issues:**
 - Option A requires updating all 16 routers and their test files simultaneously; this is a broad change with high regression risk. Stage it one router at a time.
 - Option B means deleting `services/protocols.py` (398 lines) and all `cast("…Service", …)` calls in `dependencies.py`. Ensure nothing outside this layer references the Protocol classes (check test files).