fix(prime-deep): drop dangling @agentic/commands/context.md include

The file was deleted in #5648; the include has been a silent no-op
since. Flagged by Copilot review on #8518.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: MarkusNeusinger

agentic/commands/prime-deep.md

@@ -18,7 +18,6 @@ gh pr list --limit 10 2>/dev/null || echo "(gh CLI not available)"
 ## Read
 
 @agentic/docs/project-guide.md
-@agentic/commands/context.md
 @docs/concepts/vision.md
 @pyproject.toml