docs: capture pdf domain language and deferred ingestion backlog

Co-authored-by: Cursor <cursoragent@cursor.com>

backlog/pdfplumber-tables.md

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+# pdfplumber for tables
+
+## Why deferred
+
+v1 uses PyMuPDF only. Dual extractors add complexity before we know tables are the failure mode.
+
+## Trigger
+
+Chunk Preview / Experiments show table cells concatenated in wrong order, or key cells missing, on table-heavy insurance PDFs — after Heading Reconstruction is otherwise fine.
+
+## Approach to try
+
+1. Keep PyMuPDF for body text + Heading Reconstruction
+2. Detect table regions (PyMuPDF or pdfplumber) and extract those via pdfplumber
+3. Flatten tables the same way DOCX does (sequential text blocks), not HTML tables in markdown (unless Strategies learn to use them)
+
+## Success criteria
+
+- Questions that answer from table cells improve without regressing prose headings
+- No second full-document parse path unless necessary