docs: explain local module test overrides

Changed

 README.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

Diff

@@ -47,6 +47,22 @@ sigil build

sigil test --report

```

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The `sigil` executable bundles the released MCP modules. When testing local

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changes to a module that is also built in, add `-L src` before the command so

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the checkout takes precedence:

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```

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sigil -L src test test/test-protocol.sgl test/test-client.sgl --report

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```

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Run unchanged server integration suites through the normal package test path;

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the current toolchain's source-path override does not expose every private

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server binding used by those tests:

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```

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sigil test test/test-server.sgl test/test-nrepl-tools.sgl test/test-channel.sgl --report

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```

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Local development against an unreleased sigil monorepo:

```