recording: drag_tools (grab and drag the handles)

[borisbat]

Sixth tutorial recording. drag_tools carries three drag tools — a draggable point, a vertical threshold line, and a rectangle region — and the interaction it teaches is the grab-and-drag: press on a handle and move it, and its bound value updates live every frame. Driven beat by beat with real synthetic input, each beat self-verifying that the gesture changed the bound payload field (drag_through_voice → record_check_changed), so a missed grab or a frozen handle aborts at teardown.

The region gets two beats, because DragRect has two modes (caught in review):

• body — grab near the center to move the whole rectangle (all four bounds travel together). Targets the bbox center.
• corner — grab a corner to resize it (only that corner moves). Targets the bbox's bottom-right corner (z,w) directly, since a center press would only move it again.

Files

• tests/integration/record_drag_tools.das — the voiced driver (intro + point + line + rect-move + rect-resize), each a real grab from the handle's registered screen bbox.
• doc/source/tutorials/drag_tools.rst — .. video:: drag_tools.mp4 + a Walkthrough section spelling out the move-vs-resize modes.
• doc/source/_static/tutorials/drag_tools.mp4 — the recording (1.18 MB, 53.3 s, 1436 frames, 0 dropped, Emma voice + −16 dB bed).

Verification

• ok:true, 1436 frames, 0 dropped; all five self-verification gates passed (bbox-exists + point x + line value + rect-move x_min + rect-resize x_max all changed).
• Eyeballed across all five beats: the resize moves only the dragged corner while the opposite corner stays put.

The headless guard is the existing test_drag_tools.das.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds the sixth narrated tutorial walkthrough for drag tools by introducing a new integration recording driver that performs real synthetic grab-and-drag interactions (point, threshold line, and rect move/resize) with per-beat self-verification, and documents the walkthrough with an embedded video.

Changes:

• Added a new integration recording driver that drags the point, threshold line, ROI body (move), and ROI corner (resize) while asserting the bound payload fields change.
• Extended the drag_tools tutorial page with a “Walkthrough” section and embedded drag_tools.mp4.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tests/integration/record_drag_tools.das	New voiced, self-verifying synthetic-input recording for the drag_tools tutorial (point/line/rect move+resize).
doc/source/tutorials/drag_tools.rst	Adds a Walkthrough section with an embedded tutorial video and a short interaction description.

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