supercharge(merge): add TypedDicts, exit_code, duration_ms, unified _emit_error
- Add _MergeJson and _MergeErrorJson TypedDicts for stable wire-format documentation - Add _emit_error(fmt, msg, code): routes errors to stdout as JSON in --json mode, suppresses duplicate stderr prose (fixes self-merge dual-emit bug) - Add t0 = time.monotonic() at _run_merge entry; add duration_ms to all 5 JSON output paths (up_to_date, fast_forward, strategy-merge, conflict, three-way) - Add exit_code to all outcome JSON envelopes (0 on success, non-zero on conflict) - Fix no-branch, format-invalid, autoshelf+force error paths to use _emit_error - Update module docstring to document exit_code, duration_ms, and JSON error schema - Fix pre-existing test failures: sha256: prefix in write_object helpers - Add test_merge_supercharge.py: 29 tests covering envelope, errors, TypedDicts, docstring
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