Release Pinmind 0.10.0

[iammedved]

Summary

• mark 0.10.0 as the current stable release
• pin the public marketplace install command to immutable tag v0.10.0
• synchronize the roadmap and documentation-contract regression

Verification

• node scripts/verify-release.mjs --run
• plugin-creator validate_plugin.py
• commit-range identity and diff checks
• Codex Security diff scan: 0 reportable findings across all 3 changed files

Release follow-up

After protected merge, create annotated tag v0.10.0 at the verified merge commit, publish the GitHub Release, and verify the tag tree against the plugin manifest.