Use consistent meeting artifact filenames

openspec/specs/meeting-recording/spec.md

@@ -110,7 +110,7 @@ Meeting Assistant SHALL allow a new recording to start after the previous run's
 
 Each run SHALL keep its own transcript session, meeting note path, artifact paths, options, audio buffer, live transcript buffer, and speaker mappings isolated from later runs.
 
-Rapidly-created meeting note, transcript, assistant context, and summary artifact filenames SHALL be distinct.
+Generated meeting note, assistant context, transcript, and summary artifact filenames SHALL use the meeting start time with minute precision in the form `yyyyMMdd-HHmm-{type}.md`, where `type` is one of `note`, `context`, `transcript`, or `summary`.
 
 #### Scenario: Hotkey stops recording with buffered audio
 - **WHEN** the user presses the hotkey to stop recording while captured audio is still buffered for transcription
@@ -123,6 +123,13 @@ Rapidly-created meeting note, transcript, assistant context, and summary artifac
 - **AND** final transcription and summary output from the stopped run use the stopped run's files
 - **AND** live transcription buffers from the stopped run are not written to the new run
 
+#### Scenario: Generated artifact names use minute precision
+- **WHEN** a recording starts at `2026-05-30T09:30:30`
+- **THEN** Meeting Assistant uses `20260530-0930-note.md` for the meeting note filename
+- **AND** uses `20260530-0930-transcript.md` for the transcript filename
+- **AND** uses `20260530-0930-context.md` for the assistant context filename
+- **AND** uses `20260530-0930-summary.md` for the summary filename
+
 ### Requirement: Transcripts are written to the configured vault folder
 Meeting Assistant SHALL write live transcript text to a markdown file in the configured vault folder.