Image sequences: a gap in the numbering holds the previous frame, as After Effects

After Effects 2026 shows the last existing file across a gap in a sequence's
numbering (case 860: files 1, 2, 4, 5 show frame 2 at frame 3; VERIFY
read-back). EffectCraft drew colour bars there. The media pool now holds the
previous file (Footage::sequence_file_held); colour bars remain only where no
file precedes the frame. Missing-frame reports on import are unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/agents.md

@@ -275,8 +275,8 @@ build real projects through these interfaces; they are worked examples of everyt
   numbered run as one item (several picked frames: that range; a folder: each run in it;
   `"sequence": false`: one still; dropped files, `"drag": true`, import as stills unless
   `"sequence": true`, as in After Effects; `"alphabetical": true`: Force Alphabetical Order, the files
-  play one after another) at `frameRate` or 30 fps (Settings ▸ Import). Missing frames show
-  colour bars, as in After Effects. `file.interpretFootage {"items":[id], "frameRate":12,
+  play one after another) at `frameRate` or 30 fps (Settings ▸ Import). A gap in the numbering
+  holds the previous frame, as in After Effects. `file.interpretFootage {"items":[id], "frameRate":12,
   "startTimecode":1001}` conforms them and sets Override Start (the item and layers that ran to its end get the new
   length). See [footage.md](footage.md).
 * **Colour of footage**: `file.interpretFootage {"items":[id], "preserveRgb":true}` is Interpret

docs/footage.md

@@ -47,8 +47,8 @@ Stills of any format EffectCraft reads can form a sequence: PNG, JPEG, TIFF, Ope
 WebP. Layered and vector documents (PSD, SVG, PDF) import one by one.
 
 **Missing frames.** Where the numbering skips a number (`shot_0003.png` is missing between
-`0002` and `0004`), the sequence shows a placeholder of colour bars for that frame, as After
-Effects does, so every other frame stays at its number. Render or copy the missing files into the
+`0002` and `0004`), the sequence holds the previous frame (`0002`) there, as After Effects 2026
+does, so every other frame stays at its number. Render or copy the missing files into the
 folder and choose File ▸ Reload Footage to fill the gaps.
 
 Agents: `file.import {"paths": ["/shots/shot_0001.png"], "sequence": true, "frameRate": 24}`.