Retrieval, Token Cost, and CLI Reference class

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Co-modified in the same commits

• test/cli.test.mjs runCli
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• cli/index.mjs runGetDocumentTree
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• docs/CLI-JSON-SCHEMA.md CLI JSON output schema (agent reference).Success shapes.get-document-tree (--json)
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• docs/RETRIEVAL-AND-CLI-REFERENCE.md Retrieval, Token Cost, and CLI Reference.3. Add-on / optional features (and where they plug in).table@L35
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• docs/RETRIEVAL-AND-CLI-REFERENCE.md Retrieval, Token Cost, and CLI Reference.6. Token-optimal retrieval (in spec).table@L117
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• docs/SPEC.md Knowtation — Specification.4. CLI.4.3 Exit codes.table@L162
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• docs/SPEC.md Knowtation — Specification.4. CLI.4.4 Config and environment.table@L174
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Acceptance Criteria
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Caps And Truncation
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• docs/DOCUMENT-TREE-V0-SPEC.md DocumentTree v0 Spec.Error Contract
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