Refactor code structure for improved readability and maintainability

docs/plans/phase_17_props_for_storytelling.md

@@ -1,6 +1,6 @@
 # Phase 17 — Props for Storytelling
 
-> **Status:** Accepted product brief. Phase 17a is user-approved. Phase 17b implementation is present and awaiting in-editor user verification. Phase 17c implementation is present; automated behavior verification and in-editor user verification are pending. Phase 17d remains deferred.
+> **Status:** Accepted product brief. Phase 17a is user-approved. Phase 17b implementation is present and awaiting in-editor user verification. Phase 17c implementation has been user-verified; no automated behavior verification result is documented. Phase 17d remains deferred.
 > **Audience:** UI/UX, architect, and implementation team.
 > **Purpose:** Product and design brief; technical contracts belong in later specifications.
 
@@ -18,7 +18,7 @@ Phase 17 is one product milestone with four ordered parts. Each part should be i
 | --- | --- | --- |
 | **17a — Prop roles and placement** | Arrange props behind or in front of characters; choose independent physical and interaction capabilities; build pass-through support props; select covered props in EDIT; use **Set Down** to release a held prop at a chosen stage spot. | First and highest | Implemented and user-approved |
 | **17b — Use spots** | Mark a handle, button, or lever on a placed prop, direct a stickman to use it, and respond through a rule. | Next | Implemented; awaiting user verification |
-| **17c — Impact wobble** | Make a prop briefly wobble after a meaningful hit. | Next | Implemented; awaiting automated behavior and in-editor user verification |
+| **17c — Impact wobble** | Make a prop briefly wobble after a meaningful hit. | Next | Implemented and user-verified; automated behavior verification is not documented |
 | **17d — Scene groups** | Organize and move several placed props together while editing a scene. | Last; lower priority | Deferred |
 
 17a's role model, saved-scene migration, fixed depth tiers, covered-object chooser, collision handling, Set Down action, and UI are implemented and user-approved. Automated test run: no execution result is documented for `tests/test_phase17a_prop_roles.gd`. The success criteria below remain regression guidance. Depth is currently a fixed behind/in-front choice; dynamic Y sorting remains deferred.
@@ -74,13 +74,13 @@ Deferred: dynamic Y sorting by character and prop ground points; built-in Use ef
 - `scripts/stage/stage_selection.gd` provides `hit_test_all()` and the stage shows an **Objects here** chooser for overlapping candidates. The current hit test uses world-space AABBs rather than exact vector-shape containment, so the chooser may include an object when the pointer is inside its bounds but outside its artwork.
 - Props use fixed behind/in-front draw tiers. Dynamic ground-point Y sorting remains deferred. `scripts/props/prop_anchor_data.gd` continues to describe reusable grip anchors; 17b Use spots are placed-instance data and remain distinct from those grips.
 - Phase 17b implementation is present. The architecture and UI contracts are documented in [Use spots: architecture](../specs/phase_17b_use_spots.md) and [Use spots: UI/UX](../specs/phase_17b_use_spots_ui.md). New Used prop rules choose one named spot; legacy whole-prop rules remain compatible. In-editor user verification is pending.
-- Phase 17c implementation is present in `scripts/props/prop_block.gd`, `scripts/stage/stage_impact_resolver.gd`, `scripts/editors/stage/sandbox_stage.gd`, `scripts/editors/stage/stage_prop_settings_view.gd`, `scripts/editors/stage/stage_run_session.gd`, `scripts/editors/stage/stage_scene_adapter.gd`, and `scripts/stage/stage_scene_io.gd`. The prop card provides the per-placement switch and EDIT sample, including for pass-through props. PLAY applies a visual-only wobble to artwork; root physics motion and collision geometry remain under normal simulation. Body contacts and identified blocking-stickman sweeps use relative approach speed, with pair tracking and cooldown to suppress repeated resting/push contact. Ragdoll and prop-prop contacts are routed through the resolver. Scene v1.4 persists the boolean and migrates older scenes to Off. Material preset mass is not part of the score; the shared resolver is the extension seam for a future editable-mass or impulse model. Automated behavior verification and in-editor user verification are pending; do not treat the implementation as verified yet.
+- Phase 17c implementation is present in `scripts/props/prop_block.gd`, `scripts/stage/stage_impact_resolver.gd`, `scripts/editors/stage/sandbox_stage.gd`, `scripts/editors/stage/stage_prop_settings_view.gd`, `scripts/editors/stage/stage_run_session.gd`, `scripts/editors/stage/stage_scene_adapter.gd`, and `scripts/stage/stage_scene_io.gd`. The prop card provides the per-placement switch and EDIT sample, including for pass-through props. PLAY applies a visual-only wobble to artwork; root physics motion and collision geometry remain under normal simulation. Body contacts and identified blocking-stickman sweeps use relative approach speed, with pair tracking and cooldown to suppress repeated resting/push contact. Ragdoll and prop-prop contacts are routed through the resolver. Scene v1.4 persists the boolean and migrates older scenes to Off. Material preset mass is not part of the score; the shared resolver is the extension seam for a future editable-mass or impulse model. The user has verified Phase 17c; no automated behavior verification result is documented.
 - Stage multiselection can move several objects together in one edit, but it does not save persistent group membership. Phase 17d must preserve independent member identities and prop-targeted actions when adding saved groups.
 - Relevant prior context: [Phase 11 prop interactions](../specs/phase_11_prop_interactions.md) and the live [feature backlog](../ideas/feature_backlog.md).
 
 ## Regression checks and future design questions
 
-17a's settings controls, overlap chooser, Set Down release-point behavior, legacy scene defaults, implementation, and UI are user-approved. Keep the table/pot support and pass-through case, blocking movement, open-air and corrected Set Down targets, invalid-target recovery, covered-object selection, repeat PLAY reset, and old-scene replay as regression guidance. For 17c, regression checks should cover EDIT preview and cancellation; pass-through availability; fixed and moving props; a walking/running stickman contact and blocked movement sweep; a falling ragdoll; prop-to-prop hits with both enabled and one disabled; slow/resting contacts and sustained pushes; pause/resume and STOP/replay; per-instance save/reload; and v1.0–v1.3 migration to Off. These are pending checks, not reported results.
+17a's settings controls, overlap chooser, Set Down release-point behavior, legacy scene defaults, implementation, and UI are user-approved. Keep the table/pot support and pass-through case, blocking movement, open-air and corrected Set Down targets, invalid-target recovery, covered-object selection, repeat PLAY reset, and old-scene replay as regression guidance. Phase 17c has been user-verified. Its regression guidance covers EDIT preview and cancellation; pass-through availability; fixed and moving props; a walking/running stickman contact and blocked movement sweep; a falling ragdoll; prop-to-prop hits with both enabled and one disabled; slow/resting contacts and sustained pushes; pause/resume and STOP/replay; per-instance save/reload; and v1.0–v1.3 migration to Off. No automated behavior verification result is documented.
 
 The following design question remains for the deferred part of Phase 17: