test(ci): close out #8264 — no suite exclusions remain

[proggeramlug]

Summary

#8333 fixed the last two assertions #8264 recorded as baseline reds. Their
SUITE_EXCLUSIONS entries in scripts/ci_e2e_scope.py stayed behind, which
does not produce a red build — it produces silence: both suites keep being
skipped in per-PR CI, so the coverage the fix earned back never runs. That is
#7708's failure mode, and it is the same thing #8321 cleaned up after #8302.

SUITE_EXCLUSIONS is now empty.

#8264, start to finish

assertion group	fixed by	status
six native_proof_buffer_views	#8302	un-excluded in #8321
shadow_slot_hygiene::canonical_str_local_keeps_shadow_binding_and_tag_dispatched_ops	#8333	un-excluded here
typed_feedback::typed_feedback_guards_direct_class_field_specialization	#8333	un-excluded here

Eight red assertions → zero.

Changes

• Remove both remaining SUITE_EXCLUSIONS entries.
• Add shadow_slot_hygiene and typed_feedback to the mapped set — --self-test
  refuses a suite that is in neither list, which is what catches the half-done
  version of this change.

Validation

Verified on this branch, at the merge of #8333:

native_proof_buffer_views  45 passed; 0 failed
shadow_slot_hygiene        13 passed; 0 failed
typed_feedback             17 passed; 0 failed

• python3 scripts/ci_e2e_scope.py --self-test — exit 0
• scripts/run_lint_gates.sh — all 48 lint-tier gates pass

#8264 can be closed once this lands.

[coderabbitai]

Caution

Review failed

The head commit changed during the review from 83e61bf to d2cf45b.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/8264-close-remaining-exclusions

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