[codex] Add plugin skill updates

[ashwinm-oai]

Summary

Groups the small plugin skill and connector updates requested in one draft PR.

Changes include:

• Adds Midpage litigation skills from midpage-ai/litigation-skills: cite-check, draft-brief, draft-long-form-memo, and litigation-update-post.
• Adds Datasite VDR workflow skills to the existing Datasite plugin using the plugin-migrator import flow: bulk-qa-answers, document-quality-check, gap-analysis, irl-tracker, launch-readiness-orchestrator, risk-analysis-audit, smart-file-renaming, and vdr-index-setup.
• Expands Render from the existing five skills to the current renderinc/render-codex-plugin source set of 21 skills. Render uses the updated plugin-migrator helper: one core SKILL.md import pass, then a separate --resources-only --include-references --include-assets pass for references/assets, both dry-run reviewed and SHA-256 verified by the helper.
• Updates Supabase to use https://github.com/supabase-community/supabase-plugin, bumps the plugin version to 0.1.10, and imports the partner PR's Supabase skill/reference updates via plugin-migrator hash-checked copy. The partner changelog files are intentionally not included because CHANGELOG.md is not an approved plugin-migrator copy surface.
• Adds a connector-only Glean plugin pointing at the released template app templated_apps_6a29c565fdd4819194f27e26218cd95a, with metadata and logo derived from App Admin Read. Verified released version asdk_app_v_6a29c566b91c81919ded9c8f7dec598c is RELEASED_AS_TEMPLATE.
• Adds Codex-facing agents/openai.yaml metadata for newly added Datasite and Render skills.
• Keeps migration hygiene split across commits: Midpage, Datasite source import, Render source import, Render resource import, Datasite/Render metadata, Supabase skill/resource import, Supabase manifest update, mechanical cleanup, then Glean connector/plugin metadata.

Source links:

• Midpage source: https://github.com/midpage-ai/litigation-skills
• Datasite source: https://github.com/DatasiteAI/codex-plugin and https://github.com/DatasiteAI/mcp-skills
• Render source: https://github.com/renderinc/render-codex-plugin
• Supabase partner PR: Update Supabase plugin repository URL and refresh agent skills Rodriguespn/plugins#1
• Glean metadata source: App Admin Read for released template app/version

Internal Slack/Gmail evidence links are captured on the Linear issue rather than in this PR body to avoid publishing internal collaboration URLs.

Notes:

• Datasite's public and internal source repos reference a few references/*.md files from inside the skill text, but those files are not present in either source repo or repo history. This PR does not invent missing Datasite support docs.
• Render email said 22 skills; the current renderinc/render-codex-plugin source contains 21 skill directories, and this PR imports all 21.
• Glean's interface.longDescription matches the full App Admin submitted description text.

Linear: https://linear.app/openai/issue/ASH-48 and https://linear.app/openai/issue/ASH-21

Validation

• Parsed changed plugin manifests/app files with python3 -m json.tool.
• Parsed all agents/openai.yaml files under Midpage, Datasite, Render, and Supabase skill trees with Ruby YAML.
• Ran git diff --check origin/main..HEAD.
• Compared Datasite and Render imported source files against their upstream repos, with only mechanical whitespace/mode cleanup ignored; no missing or substantive differences.
• Confirmed Supabase SKILL.md and security-rls-performance.md match the partner PR source byte-for-byte after plugin-migrator copy.
• Ran plugin validation for plugins/glean after moving Glean into this grouped PR.