chore: add CLAUDE.md for session 1

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

CLAUDE.md

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+# Marchwarden — Project Context
+
+## What This Is
+A network of agentic research specialists (MCP servers) coordinated by a
+principal investigator (PI) agent. Educational project learning agents, MCP,
+and agent composition.
+
+## Current Project State
+
+| | |
+|---|---|
+| **Phase** | Phase 1 complete, Phase 2 next |
+| **Last worked on** | 2026-04-08 |
+| **Last commit** | `7088f45` — Merge PR #7: M1.4 MCP server |
+| **Branch** | `main` (clean) |
+| **Tests** | 81 passing |
+| **Blocking issues** | None |
+
+## Key Files
+
+| File | Purpose |
+|---|---|
+| `researchers/web/models.py` | Research Contract v1 Pydantic models (9 types) |
+| `researchers/web/tools.py` | Tavily search + URL fetch with content hashing |
+| `researchers/web/trace.py` | JSONL trace logger |
+| `researchers/web/agent.py` | WebResearcher — inner agentic loop |
+| `researchers/web/server.py` | FastMCP server wrapping the researcher |
+| `cli/main.py` | CLI shim (not yet implemented) |
+
+## Architecture
+
+- **Researcher** = MCP server exposing `research(question) -> ResearchResult`
+- **ResearchResult** = answer + citations (with raw_excerpt) + categorized gaps +
+  discovery_events + open_questions + confidence + confidence_factors + cost_metadata + trace_id
+- **Agent loop** = Claude tool-use loop (plan→search→fetch→iterate) + synthesis step
+- **Trace** = JSONL audit log per research call at `~/.marchwarden/traces/`
+
+## Conventions
+
+- API keys live in `~/secrets` (not `.env`)
+- Wiki is at `docs/wiki/` (local git clone, not MCP — wiki MCP is buggy)
+- All merges via Forgejo API (claude-code user can't merge via MCP)
+- One branch per concern, merge via PR, delete branch after
+
+## Session Log
+
+| Session | Date | Summary |
+|---|---|---|
+| 1 | 2026-04-08 | Project creation, naming, contract design, Phase 0 + Phase 1 complete (81 tests) |
+
+## What's Next
+
+**Phase 2: CLI Shim**
+1. M2.1 — `marchwarden ask "question"` command (Click CLI, pretty-print)
+2. M2.2 — `marchwarden replay <trace_id>` command
+3. M2.3 — First smoke test: "What are ideal crops for a garden in Utah?"