bench_boards: text_same duplicates corpus_receipt's text_is (duplicate-bodies) #8809

#8776 (see #8662) merged before its follow-up commit landed. specs/verified/bench_boards.t27 defines text_same, which is an exact copy of text_is in specs/verified/corpus_receipt.t27, so the duplicate-bodies check gained one group on master. The fix (061ebaa on branch bench-boards-8662) uses corpus_receipt's text_is instead of restating it. bench_boards still passes 19 of 19.

User Scenarios

• Given specs/verified/bench_boards.t27 defines text_same which is an exact copy of text_is in specs/verified/corpus_receipt.t27, When the duplicate text_same is removed and bench_boards uses corpus_receipt's text_is instead, Then the duplicate-bodies check no longer reports a group for these two functions.

Requirements

FR-001: The definition of text_same in specs/verified/bench_boards.t27 MUST be removed.
FR-002: specs/verified/bench_boards.t27 MUST reference text_is from specs/verified/corpus_receipt.t27 instead of defining its own copy.
FR-003: The change MUST not alter the behavior of bench_boards; all existing tests MUST continue to pass.

Success Criteria

• t27c specs/verified/bench_boards.t27 compiles without errors (exit 0).
• t27c specs/verified/corpus_receipt.t27 compiles without errors (exit 0).
• The duplicate-bodies check reports zero groups for text_same and text_is (exit 0).
• The bench_boards test suite passes 19 of 19 tests (19 tests).

Boundary

• specs/verified/bench_boards.t27
• specs/verified/corpus_receipt.t27