release: v0.2.11 — macOS fixes

[George-iam]

Summary

• Changelog update for v0.2.11

Included fixes (already in main)

• fix: loadAgentKey path mismatch on macOS #73 — macOS agent key path mismatch (~/.config vs ~/Library/Application Support)
• fix: start agents before submitting intent to avoid SSE race #74 — SSE race: agents now start before scenarios apply
• fix: ensure_path checks rc file, not runtime PATH #72 — install script ensure_path false positive + source ~/.zshrc hint

After merge

Tag and publish:

git tag v0.2.11 && git push origin v0.2.11