Polish: convert all 9 tables to tabularx for robust \linewidth fitting

User flagged Table 2 (mode validation) as overflowing. Root cause: the 'Deep-layer
alignment signal' column had long multi-term cosine+rho expressions under
plain 'lccc' column spec with no width constraint.

Fix:
- Added \usepackage{tabularx} and a raggedright L column type
- Converted all 9 tables from tabular to tabularx{\linewidth}{...}
- Table 1 (main audit): plain lcccc inside tabularx, fits width
- Table 2 (mode validation): first column p{0.18\linewidth}, three wrapping L columns
- Table 3 (protocol def): tight left p{}, wrapping L measurement column, two right p{} columns
- Table 4 (all validations): p{0.18\linewidth} + three L columns
- Tables 5-9 (appendices, numeric): @{\extracolsep{\fill}} with existing lrrr... specs

Also shortened 'DFA+pen mean (3 seeds)' label to 'DFA+pen mean' in Appendix L
table to eliminate a 19.5pt overfull on that row.

Result: 0 overfull hbox warnings (was several), main content still 9 pages
exactly within E&D budget, total 17 pages.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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