ci: remove the stale assertion for retired brain-seal-refresh workflow #9640

Summary

Retire a stale integration assertion that includes a workflow intentionally deleted from master. This is part of CI recovery for all pull requests authored by dmitrii-f-t27. Active work is assigned to Claude lanes; avoid duplicate implementation.

Boundary

• cli/tri/src/gates.rs
• tools/census/quiet.txt
• tools/census/shell.txt

User Scenarios

Given current master with no brain-seal-refresh.yml, when cargo builds all tri targets and runs the existing cause_removed tests, then compilation succeeds and the active parser/footnote contract remains tested.

Requirements

FR-001: The stale test whose only subject was the retired workflow MUST be removed without removing the inline cause_removed parser and footnote guards.
FR-002: No handwritten Rust addition, restored obsolete workflow, skip-ratchet weakening or hook bypass MUST be introduced.
FR-003: Any necessary census update MUST be generated by the existing tool and attributable exactly to the retired test; unrelated movement must be investigated.
FR-004: The final PR MUST have a verified dmitrii-f-t27 author and current-SHA CI evidence.

Success Criteria

cargo build -p tri --all-targets exits 0. The remaining cause_removed parser and footnote tests pass. The relevant census gates pass with no hand-edited census data. The cli-tri check on the final SHA succeeds.

Evidence

Master cd8a656 still contains include_str! for .github/workflows/brain-seal-refresh.yml in cli/tri/src/gates.rs:9012.
CI failure: https://github.com/gHashTag/t27/actions/runs/38758247650 .
The workflow was retired and its derived-data work moved to queen-publish (#2915, #9092, #9117). Do not resurrect it.
Related CI recovery tasks: #9600, #9631, #9632, #9633, #9635.

Dmitrii Fedorov (@dmitrii-f-t27)