Rename the lowercase bash tool struct and its bounded output
accumulator, plus the file read/write helper symbols and their
tests, to contract-based names. Tool names, schemas, and behavior
are unchanged; doc and test references updated to match; the
model-visible catalog text and budget files are untouched.
Verified: cargo test -p codewhale-tui --lib (shell/registry/file/
file_tool/tool_catalog filters) 308 passed; web
public-surface-contract 13/13 passed.
CodeWhale Bot
3920028c6c