Add massive neutrino support and improve CSV/CLI output

- Add neutrino mass parameter to SpectrumConfig and CLI interface
- Update PhaseSpace component to handle neutrino mass effects properly
- Update CSV headers to show basic endpoint and all transition types
- Add --csv-verbosity option to CLI with 'full' and 'concise' options
- Fix comparison plots to properly show linear scale variations
- Add comprehensive tests for neutrino mass functionality

.llm-wiki/wiki/sources/SRC-2026-05-27-001.md

@@ -0,0 +1,40 @@
+---
+type: source
+format: markdown
+source_id: SRC-2026-05-27-001
+raw_path: raw/sources/SRC-2026-05-27-001/extracted.md
+captured: 2026-05-27
+status: skeleton
+---
+
+# 01-ssm-algorithm.md
+
+## Summary
+
+[LLM: Replace with 2-3 paragraph summary of key content]
+
+> _Auto-preview: --- title: "SSM — Spectrum Shape Method for gA Extraction" date: 2026-05-14 tags: - gA/extraction/algorithm - gA/ssm - beta-spectrum/forbidden status: active aliases: [Spectrum Shape Method, gA fitting, shape factor fit] relatednotes: - gA-extraction/02-ssnme - gA-extraction/03-tc99-case-study - gA-extraction/04-implementation-todo - nuclear-structure/01-shape-factors - corrections/05-radiative --- Spectrum Shape Method (SSM) — Step-by-Step Algorithm for gA Extraction 1. Physical Basis For forbi..._
+
+## Key Takeaways
+
+- [LLM: Most important point]
+- [LLM: Second important point]
+- [LLM: Third important point]
+
+## Entities Mentioned
+
+- [[entity-name]]
+
+## Concepts Mentioned
+
+- [[concept-name]]
+
+## Notable Quotes
+
+> [LLM: Important quote] — attribution
+
+## Source Packet
+
+- **ID:** `[[sources/SRC-2026-05-27-001]]`
+- **Extracted:** [raw/sources/SRC-2026-05-27-001/extracted.md](../raw/sources/SRC-2026-05-27-001/extracted.md)
+- **Manifest:** [raw/sources/SRC-2026-05-27-001/manifest.json](../raw/sources/SRC-2026-05-27-001/manifest.json)