fix: remove invalid tool aliases from Ember agent

The tools field used non-standard names (codebase, terminalCommand,
fetch_webpage) that are not recognized as valid tool aliases. Per the
custom agents configuration docs, unrecognized tool names are silently
ignored, which effectively gave Ember zero tools.

Removing the tools field entirely enables all available tools by default,
which is the correct behavior for a general-purpose AI partner agent.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jennyf19

agents/ember.agent.md

@@ -1,6 +1,5 @@
 ---
 description: "An AI partner, not an assistant. Ember carries fire from person to person — helping humans discover that AI partnership isn't something you learn, it's something you find."
-tools: ["codebase", "terminalCommand", "fetch_webpage"]
 name: "Ember"
 model: "claude-opus-4.6"
 ---