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WebFetch: github.com is blocked outright, not "out of repo scope" — an action's README cannot be read from a session #407

Description

@bdelanghe

Measured 2026-09-10 in a worker session on #396, while trying to confirm whether actions/dependency-review-action supports the merge_group event.

target result
github.com/actions/dependency-review-action/blob/main/README.md ❌ EGRESS_BLOCKED, domain github.com
docs.github.com/... (two separate pages) ✅ 200, content returned

Why this is worth a line. #112's egress table records github.com/empathic/toolpath as ❌ 403 (out of repo scope). That attribution is wrong, or at least no longer the operative cause: the proxy refuses the domain, so scope never enters into it. A session reading that table would conclude an in-scope github.com URL is fetchable. It is not.

The consequence that bit. "Does this action support event X" is a routine verification, and the answer normally lives in the action's README on github.com. From a session it cannot be read at all. On #396 this left the dependency-review + merge_group question explicitly unmeasured rather than answered — the honest outcome, but one every future session will re-derive.

Options, smallest first: correct #112's table in place; or add github.com (raw README paths at minimum) to the allowlist; or vendor the handful of action READMEs the org pins. No preference asserted — the measurement is the contribution here.

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