feat(20-01): add tod-mib-parser Go CLI binary

- Add gosmi v1.0.4 dependency for MIB parsing
- Create poller/cmd/mib-parser/ with main.go and tree.go
- CLI accepts MIB file path and optional --search-path
- Outputs JSON OID tree with oid, name, description, type, access, status, children
- Errors output as JSON {"error":"..."} to stdout (exit 0) for Python backend
- Panic recovery wraps gosmi LoadModule for malformed MIBs
- Parent-child tree built from OID hierarchy with numeric sort

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

poller/go.sum

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@@ -135,6 +144,9 @@ github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8
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@@ -162,7 +174,9 @@ github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVs
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@@ -234,9 +248,11 @@ google.golang.org/grpc v1.79.1 h1:zGhSi45ODB9/p3VAawt9a+O/MULLl9dpizzNNpq7flY=
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