[cocolato]

--print currently writes the requested report to stderr, leaving a pipe or redirected stdout empty. Write traceback and exception text to stdout, keep omission notices on stderr, and preserve text supported by the stream's error handler while escaping unencodable characters. A closed stdout pipe exits quietly with status 141; a closed notice pipe does not suppress the report.

Also export DumpFormatError, CaptureTimeoutError, and CaptureInterruptedError from the package root and update the matching API documentation and bilingual usage notes.

Refs #58. First PR in a three-part series; base: main.

Validation on CPython 3.13.15:

• Full suite: 122 passed, 1 skipped (native PID capture requires Python 3.14+).
• Coverage: 88.52%, above the 85% gate.
• Ruff lint/format checks, git diff --check, and strict Sphinx build passed.
• Package-root error exports were checked against the defining module types.

The pipe tests run real subprocesses. Encoding tests explicitly disable newline translation so byte-level assertions are portable to Windows.

CI on the latest head: all 10 checks passed, covering Linux Python 3.11–3.15, Windows/macOS Python 3.14, quality, documentation, and distributions. Workflow run.