chore: update managed block version to 0.2.5a1 in AGENTS.md

This change reflects the new versioning in the managed block section of AGENTS.md, aligning it with the recent version bump to 0.2.5a1. No other content changes were made in this file.

Author: dzmitrys-dev

AGENTS.md

@@ -167,6 +167,6 @@ CI guard candidate: a script that fails when `README.md` changes without bumping
 - New hook target: add module under `src/supamem/hooks/<client>.py`, register in `cli.py hook` dispatcher
 - Failure in network code: blanket `except Exception: pass` is correct for non-essential probes (update_check); for indexing/retrieval, surface error to user via `err_console`
 
-# BEGIN SUPAMEM v0.2.1 MANAGED BLOCK — DO NOT EDIT
+# BEGIN SUPAMEM v0.2.5a1 MANAGED BLOCK — DO NOT EDIT
 @~/.supamem/share/rules/dual-memory.md
-# END SUPAMEM v0.2.1 MANAGED BLOCK
+# END SUPAMEM v0.2.5a1 MANAGED BLOCK