[honbin]

Summary

• Handle a closed stdout quietly. ts-series and ts-align panicked (exit 101) and ts-burst exited 1 with Error: Os { code: 32, kind: BrokenPipe, .. } when piped into | head. ts-dist had the same latent issue via println!. All four now write through a BufWriter and treat BrokenPipe as a clean stop (exit 0), matching ts-window / ts-window-audit / ts-timeline.
• Report what ts-align drops from its input. Unparseable lines were skipped silently, and duplicate timestamps collapsed to the last value, so the per-file counts in the stderr summary hid both. Each is now reported per file on stderr (skipped N unparseable line(s), N duplicate timestamp(s), last value kept). Join behavior and stdout are unchanged.
• Make ts-burst return ExitCode like the other tools. Read/write errors now print a ts-burst: … message instead of Rust's Debug-formatted Error.
• Print -0 as 0 in ts-series values and ts-timeline min/max labels. fmt_minmax now compares min/max numerically, so a -0/0 pair no longer falls back to the raw min -0 · max 0. Tooltips in ts-timeline still show the raw value.
• Reject single-value flags given more than once (previously the last one silently won): --from / --to / --field (ts-window), --from / --to / --limit (ts-window-audit), --window (ts-correlate), --display-offset (ts-timeline). --series stays repeatable.
• README: say which tools read files instead of stdin (ts-correlate, ts-align, ts-timeline), match ts-align's stderr summary wording, and mention its skipped/duplicate reporting.

Verification

• cargo fmt --check — passed
• cargo clippy --workspace --all-targets -- -D warnings — passed
• cargo test --workspace — passed
• New tests:
  • closed_stdout_exits_quietly for burst / series / dist / align. stdout is a pipe whose read end is dropped before spawn, so every write deterministically hits a closed pipe.
  • reports_skipped_lines_and_duplicates for align (fixture dup.txt).
  • negative_zero_prints_as_zero (series CLI), plus -0 cases for fmt_val / fmt_minmax in timeline's unit tests.
  • rejects_repeated_* for window / window-audit / correlate / timeline.
• The broken-pipe, align-reporting and fmt_minmax tests fail without their fixes and pass with them.
• Manually confirmed: a 200k-line input piped into | head -1 exits 0 for series / align / burst, and ts-timeline labels a -0/0 series as min 0 · max 0.

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