Docs: update the progress docs for this change

ROADMAP.md

@@ -122,6 +122,7 @@ mutated and truncated movies. Field reports from the first public week are track
 
 ## Progress log
 
+- **2026-10-12:** `soundcraft-cli convert` rejects an unparsable or zero `--rate` and an unknown `--bit-depth` (exit 1, nothing written) instead of converting with a default (#256)
 - **2026-10-10 (UI docking):** Tracks and Groups, Clips, MIDI Editor, Memory Locations, and Undo History use movable panels. Edit and Mix retain separate arrangements; Clips and MIDI Editor belong to Edit. Transport, plug-in, and specialist utility windows retain their existing hosts. Panel moves and reset are available as UI commands, and saved UI preferences retain arrangements. Common toolbar and track record-enable buttons share interaction, accessible labels and keyboard focus through `craft-ui`, retaining blue tool selection and red record-arm states. No readiness percentage change.
 - **2026-10-10** — Stage re-normalized to **pre-alpha** by the core-workflow gate (interface recording, MIDI recording and session interchange fail). Full re-measure against Pro Tools Ultimate 2026.4.1 and the standard
   progress-docs set (this page, target-app parity, gaps, roadmap, UI/format/hardware/plugin/
@@ -143,6 +144,7 @@ mutated and truncated movies. Field reports from the first public week are track
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-12 | trivial | Progress log: convert option validation (#256) |
 | 2026-10-10 | minor | Readiness-by-audience table with hours: full 950–1,450 h, mainstream 380–600 h, essentials 110–200 h |
 | 2026-10-10 | minor | Added mainstream practitioner ~36 % and essentials user ~57 % to the headline numbers |
 | 2026-10-10 | minor | Stage alpha → pre-alpha: the core-workflow gate fails on interface recording, MIDI recording and session interchange; alpha distance added |