test(hydra-gates): planted/clean acceptance bundle for gate 94

[rubenvdlinde]

Why

Gate 94 landed in #546 without an acceptance fixture, and main's Package invariants job is red because of it:

FAILED SUITES: test_gate_acceptance_matrix.sh
   passed: 93 · quarantined: 2 · failed: 1

That ratchet is a hard failure for a gate declared in the runner with neither a planted/clean bundle nor an UNCOVERED.md row — deliberately, so "a gate cannot be added to the runner and left untested in silence." The ratchet did exactly its job; #546 merged over it. This PR is the missing bundle.

What it pins

The two arms differ only in the host the shipped URLs point at. planted/ reproduces the fleet's actual 2026-08-22 state: <bugs>, <website>, <repository> and <screenshot> all still on codeberg.org a month after the last codeberg remote was removed.

Two shapes are deliberate, and both would catch a plausible wrong repair:

Shape	What it would catch
Both arms carry a prose mention of "codeberg" in <description>	a scanner that grepped the whole file instead of URL-bearing fields would fail the clean/ arm — and a gate that flagged every historical mention would be noisy enough to switch off
Both arms carry an identical <screenshot> path	a checker keyed on the path rather than the host would misgrade the pair

The subject substring is codeberg.org, not a field name: the finding is "this URL points at a retired host" and the URL is what a human needs to see. A gate reporting only a count would satisfy a nonzero-exit check for free while naming nothing — the failure shape this whole suite exists to catch.

Verification

$ bash hydra-gates/scripts/lib/test_gate_acceptance_matrix.sh
PASS — coverage ratchet intact — every declared gate is either fixtured or listed with a reason
   declared gates:      74
   with planted/clean:  67   (94 now included)
   passed: 181 · failed: 0
ALL gate acceptance controls PASSED

Direct checker run over the two arms: planted/ → 4 findings naming each URL; clean/ → checked 1 shipped metadata file(s) [full tree]: 0 failure(s), rc 0.