feat(check-reporting): automate PRISMA flow cascade arithmetic verification

[Yoojin-nam]

PR T1-8: check-reporting PRISMA cascade arithmetic auto-verify

Title: feat(check-reporting): automate PRISMA flow cascade arithmetic verification

Summary

Adds scripts/prisma_cascade_check.py to /check-reporting that
computes the canonical PRISMA flow chain from raw round-by-round
screening TSV artifacts and cross-checks against manuscript prose claims.

Motivation

PRISMA 2020 flow diagrams chain a cascade of subtractions. Off-by-one
errors in the prose are a high-frequency reviewer red flag and a
recurring root cause of revision rounds. Cross-project precedents
(anonymized):

• DTA-MA example: Results prose PRISMA cascade `151 + 108 + 39 + 1 + 1
  • 4 = 304` followed by a prose summary "305" four lines later.
• Outcome-MA example: Table 2 row total disagreed with computed
  cascade by 5.

These errors survive manual checks because the cascade is intuitive
("looks roughly right"). The deterministic recompute catches them.

Changes

• skills/check-reporting/scripts/prisma_cascade_check.py — new script.
  • Reads round1/round2/round3 TSV/CSV
  • Configurable decision columns
  • Computes cascade arithmetic (round-to-round excluded counts)
  • Optional manuscript prose grep with best-effort patterns for
    "X records retrieved for full-text" / "Y studies included in
    synthesis" forms
• skills/check-reporting/SKILL.md — adds the "PRISMA Cascade Arithmetic
  Auto-Verify" section with command, behavior, and "treat drift as P0"
  guidance.
• skills/check-reporting/tests/test_prisma_cascade.sh — 4 cases
  (TSV-only, matching prose, off-by-one prose, bad column).

Test plan

• bash skills/check-reporting/tests/test_prisma_cascade.sh — 4/4 PASS
• bash scripts/validate_skills.sh
• Integration with /meta-analysis Phase 3f reconciliation gate

Related

• PR T1-1 (cross_document_n_check.py for the broader N-drift family)
• PR T1-5 / T1-6 (pool lock + entry gate that produce the TSV inputs)

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