fix: drop unused Path import (ruff F401) - project QC sweep; docs: sweep report

docs: porting guide additions - langextract, new flags, rebuild trigger, updated checklist

docs: langextract audit + POC adoption + final Sept-2026 completeness statement

docs: external-source challenge verdicts + adoptions

docs: naive baseline decision entry

docs: final AB verdict - nemotron probes rank-0 4/4 verified, VL-reranker no-regression

docs: Sept-2026 upgrade A/B measured results

docs: license revision + NC variant decisions

docs: record doc summaries + quick ingest in decision log

docs: record demo chat upgrades in decision log

Record real-TM validation campaign results (TM-5-811-6)

Add machine porting guide (Mac -> DGX Spark -> factory floor)

feat(app): side-by-side comparison panel (4 strategies, citations, page images, opt-in LLM answers); pin gradio 5.50.0

docs: hard-PDF validation campaign results (93.75% hard / 100% qa, GPU vision lanes 8/8, rotated-scan limitation)

docs: record post-validation bug audit in DECISIONS.md

Add validation-results section: CPU gates G1-G5 + GPU smoke v6 10/10 PASS

factory-rag full rebuild: all modules, docs, smoke driver