Prepare 0.4.10 release

[ictechgy]

Summary\n- bump package, Claude plugin, and marketplace metadata to 0.4.10\n- promote Unreleased changelog entries to 0.4.10\n- include README/GitHub Pages polish in release notes\n\n## Validation\n- python3 scripts/sync_plugin_copies.py --check\n- git diff --check\n- python3 scripts/prepublish_check.py\n- python3 scripts/release_smoke.py --timeout 20\n- npm pack --dry-run

[ictechgy]

Release v0.4.10 review evidence

Target: PR #199 / release-v0.4.10 / commit 46e2443
Scope: version metadata and changelog promotion only.

Tracks:

• Codex local review: PASS
  • package.json version is 0.4.10.
  • plugins/context-guard/.claude-plugin/plugin.json version is 0.4.10.
  • .claude-plugin/marketplace.json plugin version is 0.4.10.
  • CHANGELOG.md contains a non-empty 0.4.10 entry dated 2026-06-14.
  • No runtime/package payload files changed.
• Claude/Forge/Agy tracks: unavailable for this release-prep micro-diff in this deployment turn; no blocker findings from automated gates.

Validation already run locally:

• python3 scripts/sync_plugin_copies.py --check -> plugin copies synchronized
• git diff --check -> OK
• python3 scripts/prepublish_check.py -> prepublish check: OK
• python3 scripts/release_smoke.py --timeout 20 -> release smoke: OK
• npm pack --dry-run -> @ictechgy/context-guard@0.4.10 tarball preview OK

Blockers: none.