v1.9.0

Automated release: version and notes generated from pull requests merged since 1.8.1.

• One time grammar (issue #189 B, docs/design-decisions.md "Time grammar", roadmap 1.9.0): broll.py, cut.py and freeze.py now parse their times through time_arg() like every other tool, so a bad or fps-less value is kind: input naming the flag; hh:mm:ss:ff@fps (e.g. 00:01:02:15@29.97) names a timecode's rate explicitly and is accepted by every time-taking flag and cue file. references/scripts.md documents the grammar once.
• Eval 8 follow-ups. render.py turns --normalize on by default for a platform export preset when the project has no loudness stage ("normalize": false opts out); SKILL.md shows the Japanese shape of the report next to the English one, lists a join.py that scaled or padded a clip under the Look rule, and says when --codec / --quality are the right call.
• probe gains hdr_signal (true only for a PQ / HLG transfer or Dolby Vision) next to hdr, which keeps counting BT.2020 primaries on an SDR transfer until 2.0 renames it (issue #189 A1, pre-shipped as a parallel key).
• feat: one time grammar (@fps, time_arg in broll/cut/freeze), probe hdr_signal, eval-8 follow-ups (#206)

What's Changed

• feat: one time grammar (@fps suffix, time_arg in broll/cut/freeze) and probe hdr_signal by @claude[bot] in #206

Full Changelog: v1.8.1...v1.9.0