Capybara v8 False-Claims Regression

Description

Internal regression metric exposed in leaked source: Capybara v4 had a 16.7% false-claims rate (model asserts completion when tasks are actually incomplete or incorrect, e.g., 'all tests pass' when they don't), while Capybara v8 regressed to 29-30% — nearly doubling. This specific regression is the direct motivation for the three-layer verification fix (agent -> verifier -> spot-check) and for the assertiveness counterweight that blocks unprompted aggressive rewrites.

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src-20260409-5acfec94bd6e