fix(plugin): drop core: prefix — commands use code: namespace from dir

Plugin commands derive namespace from directory (claude/code/) not
the name field. Commands now: /code:dispatch, /code:status, /code:recall,
/code:review, /code:sweep, /code:scan.

Co-Authored-By: Virgil <virgil@lethean.io>

claude/code/commands/dispatch.md

@@ -1,5 +1,5 @@
 ---
-name: core:dispatch
+name: dispatch
 description: Dispatch a subagent to work on a task in a sandboxed workspace
 arguments:
   - name: repo

claude/code/commands/recall.md

@@ -1,5 +1,5 @@
 ---
-name: core:recall
+name: recall
 description: Search OpenBrain for memories and context
 arguments:
   - name: query

claude/code/commands/remember.md

@@ -1,5 +1,5 @@
 ---
-name: core:remember
+name: remember
 description: Save a fact or decision to context for persistence across compacts
 args: <fact to remember>
 ---

claude/code/commands/review.md

@@ -1,5 +1,5 @@
 ---
-name: core:review
+name: review
 description: Review completed agent workspace — show output, git diff, and merge options
 arguments:
   - name: workspace

claude/code/commands/scan.md

@@ -1,5 +1,5 @@
 ---
-name: core:scan
+name: scan
 description: Scan Forge repos for open issues with actionable labels (agentic, help-wanted, bug)
 arguments:
   - name: org

claude/code/commands/status.md

@@ -1,5 +1,5 @@
 ---
-name: core:status
+name: status
 description: Show status of all agent workspaces (running, completed, blocked, failed)
 ---
 

claude/code/commands/sweep.md

@@ -1,5 +1,5 @@
 ---
-name: core:sweep
+name: sweep
 description: Dispatch a batch audit across all Go repos in the ecosystem
 arguments:
   - name: template