test(e2e): re-point Tier-C kiln blocker to the durable umbrella kiln#375 (#297)

[avrabe]

What

Re-points tier_c_fused_executes_on_kiln's ignore reason off the now-closed kiln#382 to the durable umbrella kiln#375, with the full kiln-side layer progression documented. Test-annotation only; stays #[ignore]d.

Why

kiln#382 (E5DC2) shipped in kiln v0.4.0, so the annotation referenced a closed issue. Re-verified on post-#382 kilnd: E5DC2 is gone (component "initialized and running"), but the run export now fails [Runtime][E0BBB] Export not found. Same fused.wasm still runs on wasmtime 41 → meld's output is spec-valid; E0BBB is the next kiln-side layer, on kiln#375. Pointing at the umbrella avoids re-pointing again as kiln clears each sub-layer.

Refs #297, kiln#375.

🤖 Generated with Claude Code

[github-actions]

LS-N verification gate

✅ 58/58 approved LS entries verified

	count
Passed (≥1 test, all green)	58
Failed (≥1 test failure)	0
Missing (no ls_*_NN_* test found)	0

_{Approved loss-scenarios.yaml entries are expected to have a
regression test named ls_<letter>_<num>_* (e.g. LS-A-11 →
ls_a_11_*). The gate runs each prefix via cargo test --lib --no-fail-fast and aggregates pass/fail/missing.}

Failed LS entries

(none)

Missing regression tests

(none)

_{Updated automatically by tools/post_verification_comment.py.
Source of truth: safety/stpa/loss-scenarios.yaml.}