Describe dragging a rigidbody while the game plays

A held body follows the mouse and starts from rest on release. The check total in Development is now 1357.

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

Development.md

@@ -14,7 +14,7 @@ npm run build        # writes dist/ and regenerates index.html
 ./build.sh           # the same under `set -o pipefail`, for callers that pipe the output
 php tools/make-user.php <name> <password> [admin|user]        # an account; every tool signs in (see Accounts)
 php tests/php/accounts.test.php                               # the API's account rules, no server needed (CI's gate job)
-node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 1356 editor checks, screenshots in /tmp/gm-e2e-*.png
+node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 1357 editor checks, screenshots in /tmp/gm-e2e-*.png
 GM_STEPS=20 node tools/e2e.mjs                                # or 1-12, or 6,20 — a subset while working on one step
 ./e2e.sh start [GM_STEPS]                                     # the same run detached, see below
 ./e2e.sh status                                               # live progress, or the last run's result

Physics.md

@@ -156,6 +156,11 @@ nothing on it.` They work from `On start` on.
 `Move` and `Set position` on a dynamic body put it somewhere else and it keeps its velocity; the
 first time the console points to the nodes above, which move it with the physics.
 
+Dragging a dynamic body in the scene view while the game plays (the object, its rigidbody, or an
+object above it) takes it out of the simulation for as long as the mouse holds it: it follows the
+pointer as if it had no rigidbody, and gravity does not pull it. Let go, it starts again at rest,
+with no velocity.
+
 ## Play and the editor run
 
 The editor loads the engine right after opening the project; Play waits for it if it is not there