Document Obsidian project memory

AGENTS.md

@@ -11,10 +11,11 @@ These rules apply to every change under this project root.
 
 ## Workspace and reference boundaries
 
-- The active project root is `D:\Projects\HealerMan`. All implementation,
+- The active project root is the directory containing this `AGENTS.md`
-  generated content, scripts, tests, builds, documentation, and validation for
+  (currently `F:\Projects\HealerMan`); do not assume a fixed drive letter. All
-  this project belong here.
+  implementation, generated content, scripts, tests, builds, documentation, and
-- `D:\Projects\wow-pvt-server-backups-2` is historical reference material only.
+  validation for this project belong here.
+- The sibling `../wow-pvt-server-backups-2` tree is historical reference material only.
   Inspect it only when old-server behavior, AzerothCore data, creature IDs,
   spells, encounters, maps, or assets are useful as source information.
 - Never treat `wow-pvt-server-backups-2` as the active project, primary checkout,
@@ -27,6 +28,22 @@ These rules apply to every change under this project root.
   structure as appropriate, and validate it through HealerMan's tests/build and
   playtest workflow.
 
+## Obsidian project memory
+
+- The separate Healer-Man knowledge vault lives at the sibling path
+  `../ObsidianNotes/ObsidianVault1`. Start at
+  `00 Home/Healer-Man Hub.md` and follow
+  `40 Agent Workflows/Agent Memory Protocol.md` for broad or cross-system work.
+- The code and tests in this repository remain authoritative. Check a note's
+  `last_verified` date and verify material claims against current code before
+  acting on them.
+- Update the relevant vault note in the same task when a change alters feature
+  behavior, architectural ownership, entry points, cross-file relationships,
+  invariants, or required validation. Use repository-relative code paths and
+  keep transient investigation details in the vault's `50 Worklog/` area.
+- The vault is its own Git repository. Review and commit its changes separately
+  from HealerMan changes; never stage one repository from the other.
+
 ## Dungeon report triage
 
 - For any request to inspect or fix current dungeon reports, start with