Verify: Add 5-class node classification (Source/Input/Process/Output/Claim)

[ywatanabe1989]

Summary

Add semantic role classification to DAG nodes in the verify module: Source, Input, Processing, Output, Claim.

Current State

file_hashes table tracks files but doesn't classify them by pipeline role. The 3 states (VERIFIED, FAILED, UNKNOWN) describe integrity but not function.

Proposed Changes

1. Add role column to file_hashes schema: source | input | process | output | claim
2. Auto-infer role from file type/location (.py scripts → source/process, .csv/.npy → input/output)
3. Surface role in Mermaid DAG visualization (shape/color per class)
4. Enable role-based severity analysis in BPV output

Class Definitions

Class	Description	Examples
Source	Data acquisition scripts	01_source.py
Input	Raw data, configuration	source.csv, config.yaml
Processing	Transform/analysis scripts	02_preprocess.py
Output	Intermediate/final data	clean_A.csv, results.csv
Claim	Paper assertions	p=0.003 (L.42), Figure 1

Motivation

• Enables severity analysis: Source-level tampering → full invalidation; Output-level → specific Claims
• Framework-agnostic vocabulary readers can map to their own pipelines
• Aligns verify module with figrecipe Schematic's node classes (figrecipe#95)