chore: Pre-approve the github-projects MCP server for all clones

Cloud sessions cannot grant the one-time interactive trust approval
that project-scoped MCP servers require, so the github-projects server
from .mcp.json (added in #130) connected as "Pending approval" and
exposed no tools. Committing enabledMcpjsonServers approves that
specific named server for every clone of this repo.

Reviewer note: because this pre-approves whatever the github-projects
entry in .mcp.json points at, future changes to .mcp.json deserve the
same review scrutiny as workflow files.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018ypQTqqVy5n8xMPxQSKLMC

Author: tablackburn

.claude/settings.json

@@ -0,0 +1,3 @@
+{
+  "enabledMcpjsonServers": ["github-projects"]
+}