feat: add proposal-writer agent to registry

Register Mathews-Tom/proposal-writer in the productivity category.

Author: Mathews-Tom

agents/Mathews-Tom__proposal-writer/README.md

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+# proposal-writer
+
+Technical proposal generation agent with ROI calculation, three-tier pricing, and business-value framing. Uses a Problem-Agitate-Solve narrative structure with optional PDF export for client-ready deliverables.
+
+---
+
+## Run
+
+```bash
+npx @open-gitagent/gitagent run -r https://github.com/Mathews-Tom/proposal-writer
+```
+
+---
+
+## What It Can Do
+
+- **ROI Calculation** — Quantify return on investment with cost-benefit analysis and payback period estimation
+- **Three-Tier Pricing** — Generate good/better/best pricing structures with feature differentiation
+- **Problem-Agitate-Solve Narrative** — Structure proposals using PAS framework for maximum persuasion
+- **Business-Value Framing** — Translate technical capabilities into business outcomes and executive language
+- **PDF Export** — Produce formatted, client-ready PDF documents
+- **Competitive Positioning** — Differentiate offerings against alternatives with evidence-based comparisons
+
+---
+
+## Structure
+
+```
+proposal-writer/
+├── agent.yaml
+├── SOUL.md
+├── RULES.md
+├── LICENSE
+├── icon.png
+└── banner.png
+```
+
+---
+
+## Built with
+[gitagent](https://github.com/open-gitagent/gitagent) — a git-native, framework-agnostic open standard for AI agents.

agents/Mathews-Tom__proposal-writer/banner.png

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+{
+  "name": "proposal-writer",
+  "author": "Mathews-Tom",
+  "description": "Technical proposal generation with ROI calculation, three-tier pricing, and business-value framing with optional PDF export",
+  "repository": "https://github.com/Mathews-Tom/proposal-writer",
+  "version": "1.0.0",
+  "category": "productivity",
+  "tags": ["proposal", "roi", "pricing", "business", "client-facing", "bidding", "sales"],
+  "license": "MIT",
+  "model": "claude-opus-4-6",
+  "adapters": ["claude-code", "system-prompt"],
+  "icon": true,
+  "banner": true
+}