Add plugin ID to skill analytics

[alexsong-oai]

Summary

• thread plugin skill roots through the skills loader with their plugin ID
• store plugin ID on loaded skill metadata for plugin-provided skills
• include plugin ID on skill invocation analytics events

Test plan

• cargo check -p codex-core-skills
• cargo check -p codex-core -p codex-core-plugins -p codex-analytics
• cargo check -p codex-tui
• cargo check -p codex-plugin -p codex-core -p codex-core-plugins -p codex-analytics
• cargo check -p codex-app-server
• cargo test -p codex-analytics
• HOME=/private/tmp/codex-empty-home cargo test -p codex-core-skills
• just fix -p codex-core-skills
• just fix -p codex-analytics
• just fix -p codex-core-plugins
• just fix -p codex-core
• just fmt
• git diff --check

[alexsong-oai]

@codex review

[alexsong-oai]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 124b5ab096

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[alexsong-oai]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Can't wait for the next one!

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".