Pure rename — no logic change. The header is consumed only by
internal/cbm/extract_*.c, depends on tree_sitter/api.h, and is purpose-
built for AST traversal during extraction. The "extract_" prefix makes
the scope explicit and keeps the file naming consistent with its
neighbours (extract_calls.c, extract_imports.c, ...).
- internal/cbm/ts_node_stack.h -> internal/cbm/extract_node_stack.h
- Include guard CBM_TS_NODE_STACK_H -> CBM_EXTRACT_NODE_STACK_H
- Header banner comment updated
- 9 call sites in internal/cbm/extract_*.c updated to the new path
Full suite: 2824 passed, 0 failed.
