fix: keep root memory uppercase (#70621)

Thanks @mbelinky.

docs/concepts/memory-qmd.md

@@ -52,8 +52,7 @@ legacy `--mask` collection flags and older MCP tool names when needed.
   configured `memory.qmd.paths`, then runs `qmd update` + `qmd embed` on boot
   and periodically (default every 5 minutes).
 - The default workspace collection tracks `MEMORY.md` plus the `memory/`
-  tree. Lowercase `memory.md` remains a bootstrap fallback, not a separate QMD
-  collection.
+  tree. Lowercase `memory.md` is not indexed as a root memory file.
 - Boot refresh runs in the background so chat startup is not blocked.
 - Searches use the configured `searchMode` (default: `search`; also supports
   `vsearch` and `query`). If a mode fails, OpenClaw retries with `qmd query`.

docs/concepts/system-prompt.md

@@ -109,7 +109,7 @@ Bootstrap files are trimmed and appended under **Project Context** so the model
 - `USER.md`
 - `HEARTBEAT.md`
 - `BOOTSTRAP.md` (only on brand-new workspaces)
-- `MEMORY.md` when present, otherwise `memory.md` as a lowercase fallback
+- `MEMORY.md` when present
 
 All of these files are **injected into the context window** on every turn unless
 a file-specific gate applies. `HEARTBEAT.md` is omitted on normal runs when