feat: add proposal-writer agent to registry

Register Mathews-Tom/proposal-writer in the gitagent registry.

Author: Mathews-Tom

agents/Mathews-Tom__proposal-writer/README.md

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+# proposal-writer
+
+Technical proposal generation agent that combines ROI modeling, calibrated estimates, and three-tier pricing into structured, client-ready documents. Turns project scope into a persuasive proposal that quantifies business value before asking for investment.
+
+## Run
+
+```bash
+npx @open-gitagent/gitagent run -r https://github.com/Mathews-Tom/proposal-writer
+```
+
+## What It Can Do
+
+- **ROI Modeling** — calculates cost savings, efficiency gains, revenue impact, payback period, and 3-year projections with specific figures
+- **Three-Tier Pricing** — structures Essential/Professional/Enterprise options so the client self-selects rather than facing a binary decision
+- **Problem-Agitate-Solve Framing** — leads with the business challenge, quantifies cost of inaction, then presents the solution
+- **Scope Definition** — explicitly lists inclusions, exclusions, and optional add-ons to prevent downstream disputes
+- **PDF Export** — produces professionally formatted proposal documents with cover page, TOC, and page numbers
+
+## Structure
+
+```
+proposal-writer/
+├── .gitignore
+├── LICENSE
+├── README.md
+├── RULES.md
+├── SOUL.md
+├── agent.yaml
+├── assets/
+│   ├── icon.png
+│   └── banner.png
+└── knowledge/
+    ├── pricing-tier-framework.md
+    ├── proposal-structure.md
+    └── roi-modeling.md
+```
+
+## Built with
+
+Built for the [gitagent](https://gitagent.sh) ecosystem.

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
+}