RobinTail / express-zod-api / 26021913738

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Add agentic classification to the headers workflow (#3400)

This PR adds an agentic automation to the well-known headers updating
workflow.
The goal is to delegate the labor that used to require more manual
effort.
It involves a GitHub hosted LLM equipped with an RFC lookup tool for
headers classification.
Response-only headers are extracted into a maintained list of exceptions
within dedicated files.
Both lists are improted statically for a further incremental update.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

* **New Features**
* Automated RFC-backed header classification with incremental updates
and timestamped refresh tracking.
* Published curated response-only header list and updated recognized
well-known headers (adds cdn-loop; multiple headers removed).
  * Agent-powered RFC evidence lookup to validate classifications.

* **Chores**
* Dev tooling and workspace config updated; classifier dev dependency
added.
* CI workflow improved to push timestamped, ref-aware PRs for header
updates.

* **Tests**
  * Test threshold adjusted to match the trimmed header list.

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: RobinTail <13189514+RobinTail@users.noreply.github.com>

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