Document how to use the OKF4net MCP server with Zed

[jchable]

Difficulty / est. effort: ~1h, small (docs + config)

Context: Zed is a fast modern editor whose assistant supports MCP via "context servers". A recipe lets Zed users consult an OKF bundle via okf-mcp. src/OKF4net.Mcp/README.md documents only Claude today.

Files to touch: src/OKF4net.Mcp/README.md (add a ### Use with Zed section).

What to do:

1. Add a ### Use with Zed section.
2. Show the Zed settings.json context_servers entry pointing at okf-mcp with the bundle-path args (Zed uses its own shape, e.g. "context_servers": {"okf": {"command": {"path": "okf-mcp", "args": ["<bundle>"]}}}). Verify against current Zed docs and link them: https://zed.dev/docs/ai/mcp
3. Mention OKF_MCP_READONLY=1.

How to verify:

1. dotnet tool install -g OKF4net.Mcp (installs okf-mcp).
2. Point the config at a small test bundle (e.g. tests/fixtures/ has example bundles, or make a throwaway one with a single type:-tagged concept).
3. Restart the editor, open its MCP/agent panel, and confirm the okf server connects and the OKF tools appear (okf_read_concept, okf_browse, okf_graph, okf_search, okf_validate_bundle, okf_changes_since).
4. Ask the assistant to read or browse a concept from the bundle and confirm it works. Add a OKF_MCP_READONLY=1 note for read-only use.

Docs-only change — no build impact — but run dotnet build OKF4net.sln to be safe.

Good to know: Model the new section on the existing "Use with Claude Desktop" block in src/OKF4net.Mcp/README.md (same command: "okf-mcp" + bundle-path args, or OKF_BUNDLE_ROOT env). MCP is a standard stdio protocol, so the server itself needs no change — only the client-side config differs. See CONTRIBUTING.md. If you get stuck on a config format, open a Discussion.