Inspect the indexed structure of one repository-relative file path. Use this
after search or list_files when you need to see the symbols, line spans,
breadcrumbs, and chunk boundaries in a file before reading raw chunks.
The tool only reports data from the selected SIFS index. It does not read
arbitrary unindexed files. Use `kind` or `kinds` to focus on symbol kinds such
as `function`, `struct`, `class`, or `case`. Use `symbols_limit`,
`chunks_limit`, and `no_chunks` to keep large files bounded.