v4.8.1 — staticcheck is back

Mirrors baseline v4.8.1, staticcheck reads Go 1.27.2 again, pinning baseline commit aafa39f.

The staticcheck gate is back. Staticcheck 2026.2.2 (v0.8.2), released on 2026-10-12, reads the export data Go 1.27.2 writes (dominikh/go-tools#1832). Under the pin, the export-data error the baseline's operations/ci.md names no longer comes out, so the line is back in Makefile and verify.sh and the README's waiver is gone. Staticcheck reports nothing to fix. verify.sh's header, the README's file list and SPEC.md's first acceptance criterion no longer allow for a waived gate.

./verify.sh exits 0 over 79 gates, staticcheck among them, and make ci is green on this commit under Go 1.27.2.