v0.12.3

Fixed

• summary no longer writes a stub file on empty days. v0.12.2
  added "skip claude on empty input" but compromised it by writing
  a ## Context\n\nNo activity recorded … stub into
  ~/.agenthud/summaries/YYYY-MM-DD.md every time — opposite of the
  "don't waste anything on nothing" intent. Now matches the range
  path: announce, return success, touch no disk.
• summary --open-index / -I now works on empty days. The
  flag is for navigating the past-summaries hub, so it shouldn't be
  gated by whether today produced a new file. runSummary now
  fires regenerateIndex and openInDefaultApp(index.md) whenever
  -I is set, independent of the daily result.
• summary --last Nd on an all-empty range returns exit 0. The
  whole rest of the codebase treats "no activity" as a normal state
  (report, daily summary). Range mode was returning 1 — fixed.
  The empty-range branch also honors -I now.
• Clearer skip message in range mode. Previously printed
  <label> — skipped by user even when claude was never asked
  (because the day was empty). Replaced with a neutral
  <label> — skipped since the two cases are indistinguishable at
  the result-shape level.

Added

• POSIX-style short-flag clusters. agenthud summary -oI now
  parses as -o -I; -yo as -y -o; etc. The expander only
  triggers on - + two-or-more letters, so the documented -Nd
  date short-form (--date -1d) is left intact.

Upgrade notes

• Empty-day stub files left over from v0.12.2 are not auto-deleted
  — rm ~/.agenthud/summaries/<empty-date>.md to clean them up.
  Future empty days will not create new files.