docs: automate MkDocs to GitHub Wiki synchronization

[Sythos]

Summary

• Synchronize the published MkDocs Markdown into the linked GitHub Wiki.
• Keep docs/ as the canonical source and preserve manually managed Wiki pages.
• Pin workflow actions and attribute generated Wiki commits to Sythos.

Verification

• npm run lint
• npm run test:docs
• npm run types
• node --check tools/sync-wiki.mjs
• YAML parsing for the workflow and MkDocs configuration
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Derive excluded pages from the MkDocs configuration

When a page is later added to mkdocs.yml's exclude_docs, this fixed basename list will still copy it into the public Wiki, so drafts explicitly removed from the published MkDocs site can be exposed on the next synchronization; removing an exclusion has the inverse problem. Because the workflow deliberately runs when mkdocs.yml changes, the generator should consume that configuration or otherwise keep the exclusion rules in one canonical source.

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