Add Home page linking to all wiki pages including User Guide

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Home.md

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+# Marchwarden Wiki
+
+A network of agentic research specialists coordinated by a principal investigator agent. V1 ships a single web-search researcher exposed as an MCP server with a CLI shim.
+
+## For users
+
+- **[User Guide](UserGuide)** — install, configure, and use `marchwarden ask` / `replay` / `costs`. Start here if you just want to run the tool.
+
+## For developers
+
+- **[Development Guide](DevelopmentGuide)** — local setup, running tests, project structure, and contributor workflow
+- **[Architecture](Architecture)** — system design, MCP flow, researcher contract overview
+- **[Research Contract](ResearchContract)** — the v1 contract every researcher implements (citations, gaps, discovery events, confidence factors, cost metadata)
+- **[Roadmap](Roadmap)** — phased build plan from V1 (single researcher + CLI) through V2+ (multi-researcher network with PI orchestrator)
+
+## Project history
+
+- **[Session Retrospectives](SessionRetrospectives)** — what worked, what didn't, lessons learned per session
+- **[Session 1](Session1)** — first development session: project creation, contract design, Phase 0 + Phase 1
+
+---
+
+**Repo:** [archeious/marchwarden](https://forgejo.labbity.unbiasedgeek.com/archeious/marchwarden) · **Issues:** [open issues](https://forgejo.labbity.unbiasedgeek.com/archeious/marchwarden/issues)