- backend/text_layer.py: PyMuPDF text-layer extraction, fuzzy evidence bbox matching, 300-DPI crop rendering, coverage-gap signal - extractor (classic + agent): TEXT LAYER block appended at call sites; grounding guard gains text-layer rescue tier (grounding=text_layer stamp) - verifier: {text_layer} oracle excerpt + evidence-located hi-DPI crops replacing full-page images (fallback preserved, I2 guard intact) - coverage gaps: text-bearing pages with zero extraction -> failed-scope gap findings (agent) / log-only (classic) - config knobs: TEXT_LAYER_ENABLED/MIN_CHARS/MAX_CHARS, VERIFY_TEXT_MAX_CHARS, VERIFY_HI_DPI_CROPS, VERIFY_CROP_DPI, VERIFY_CROP_MARGIN_PTS - tests: 22 new (text_layer unit, grounding/render, runner-level flow) Spec: docs/superpowers/specs/2026-08-12-text-layer-grounding-design.md
