ci(prd): assign sequential numbers to new PRDs

prd-new-user-provider-plugins → 0053-user-provider-plugins
prd-new-named-labelled-agents → 0054-named-labelled-agents

Both PRDs ship with their implementations so Status flips Draft → Active.
Manual fix: the prd-number workflow did not fire on these merges.

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

docs/prds/0053-user-provider-plugins.md

@@ -1,6 +1,6 @@
-# PRD prd-new: User-defined agent provider plugins
+# PRD 0053: User-defined agent provider plugins
 
-- **Status:** Draft
+- **Status:** Active
 - **Author:** claude
 - **Created:** 2026-06-04
 

docs/prds/0054-named-labelled-agents.md

@@ -1,6 +1,6 @@
-# PRD prd-new: Named / Labelled Agents
+# PRD 0054: Named / Labelled Agents
 
-- **Status:** Draft
+- **Status:** Active
 - **Author:** didericis
 - **Created:** 2026-06-03
 - **Issue:** #171