You are the finishing editor at a small travel-series post house. Finish the 30-second Kerry kayak sting in Blender 5.0.

Task folder: `E:\agenthle\visual_media\blender_kerry_kayak_finishing\base`

Inputs (`input\`):
- `clip_a.mp4`, `clip_b.mp4`, `clip_c.mp4` — three parts of one continuous voice-over piece, shuffled and renamed. The voice-over was cut mid-sentence, so the spoken words are the reliable way to restore the order.
- `plate_path.mp4` — second-unit plate for the composite: a handheld walk up a footpath, 29.97 fps.
- `layout_marker_first_frame.png` — the plate at the first composite frame with a cross on the spot of ground where the guides stand (the placement numbers are in `brand_board.md`).
- `lower_third_kerry.png` — the approved lower-third, a full-frame 1920×1080 overlay.
- `client_brief.txt` — the producer's note.
- `brand_board.md` — the finishing spec. Its numbers and rules are the delivery contract.

Software: open Blender with `E:\agenthle\visual_media\blender_kerry_kayak_finishing\base\software\open_blender.bat`.

What to deliver in `E:\agenthle\visual_media\blender_kerry_kayak_finishing\base\output`:
1. `kerry_kayak_master.mp4` — H.264 video with AAC stereo audio, 1920×1080, 25 fps, built to `brand_board.md`: restored order; the opening shot composited into the plate with the guides planted on the path (matchmoved, including the camera's roll), held out by the wall, the passing post and the reeds in front of the lens, and following the plate's exposure; the lower-third on the spoken county name.
2. `final.blend` — the Blender project that renders that master headless from the files in `input\` alone. Roto must be done with Blender's own tools (Mask data-blocks, drawn and/or tracked in Blender; keying nodes may help with the occluders); pretrained segmentation or matting models are not allowed.
3. `posters\composite.png` — the master frame at 00:00:03:00 (frame index 75, counting the first frame as 0).
4. `posters\lower_third.png` — the first master frame on which the lower-third is visible.
5. `posters\end_card.png` — the last frame of the master.
6. `qc_notes.txt` — three lines:
   - `ORDER: <first file>, <second file>, <third file>`
   - `LOWER_THIRD_IN: HH:MM:SS:FF` (25 fps timecode of the first lower-third frame, starting from 00:00:00:00)
   - `COMPOSITE_METHOD: <one sentence on how you tracked and masked the shot>`

A master stitched with ffmpeg or composited outside Blender will not be accepted.
