DocumentTree v0 Spec class

COUPLING PARTNERS

Co-modified in the same commits

• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Proposed Phase Order.Phase 1A: Tree Builder Only
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Proposed Phase Order.Phase 0: Spec
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Proposed Phase Order.Phase 1C: CLI
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Later-Goal Classification.Planned Later Goals
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.JSON Contract.Success Shape.code[json]@L278
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Non-Goals
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Proposed Phase Order.Phase 1C: CLI.code[text]@L212
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Files Expected By Future Phase.Phase 1C
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.JSON Contract.Field Rules.table@L317
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Proposed Phase Order.Phase 1E: Hosted MCP.Phase 1E Tests
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Later-Goal Classification
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Files Expected By Future Phase.Phase 1D
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Proposed Phase Order.Later Phases
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• hub/gateway/mcp-hosted-server.mjs createHostedMcpServer
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Error Contract
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