feat: Implement Phase 16 - Move To: Walk and Run

- Introduced a new action type `move_to` allowing children to direct a stickman to a destination using either Walk or Run styles.
- Updated the ActionEditor UI to include Walk/Run buttons for selecting movement styles.
- Ensured compatibility with existing `walk_to` actions by converting them to the new `move_to` format during loading.
- Defined clear success criteria for the implementation, including distinct movement animations and behavior for both Walk and Run.
- Established a comprehensive verification contract to ensure functionality across various terrains and scenarios.

docs/architecture/tech_debt_and_optimizations.md

@@ -69,6 +69,8 @@ This document tracks known technical debt, optimization opportunities, and minor
 | 57  | **Speech composition must temporarily own stage input** — normal scene controls can otherwise select or alter characters and props while the user is editing speech. | Medium | Planned | Gate stage object interactions while the composer is open; keep speech bubble selection/drag, explicit speech placement, and camera-only navigation available. A non-bubble stage click clears the token target but must not activate the object underneath. Verify deferred token clicks and drag thresholds. See `docs/specs/speech_style_toolbar_refinements.md`. (2026-09-28) |
 | 58  | **Speech-wide Show settings retain per-bubble render copies** — action-level reveal and motion settings are mirrored into every bubble visual for the current renderer and duration calculations. | Low | Planned | `SpeechPayload.normalize()` is the synchronization boundary; scene and rule encoders must retain the new action-level fields. Older mixed bubble settings intentionally migrate from the first bubble when edited, so later distinct motion/reveal choices are no longer expressible in the group model. If a future renderer reads action-level settings directly, the duplicate visual keys can be removed in a versioned payload migration. See `docs/specs/speech_whole_sequence_show.md`. (2026-09-30) |
 | 59  | **Stage-only speech edits remain drafts until session completion** — a recoverable draft can differ from its queue/rule target while the child is styling. | Medium | Planned | Done speech is the single validated in-memory commit boundary. A Scene Save request during composition is deferred until the user explicitly completes speech; it never commits implicitly or writes the stale queue/rule target. Cancel speech confirms before discarding an edited draft. This avoids premature persistence of blank bubbles and stale scene data. Recovery remains draft-only. See `docs/specs/speech_stage_only_editor.md`. (2026-09-30) |
+| 60  | **Run contact timing and baked IK poses share authored gait facts** — clip duration/contact phases must agree with locomotion's stance weights and fixed travel pace. | Medium | Planned | Phase 16 keeps one locomotion controller and an authored Run clip. Tune the speed, cycle duration, foot travel, and contact windows together; flight windows must release both foot locks. The generator and runtime each need phase data, so a future data-driven gait asset may be useful if more styles are added. See `docs/specs/phase_16_running_stickman.md`. (2026-10-03) |
+| 61  | **Move To migration crosses action and trigger identities** — an old `walk_to` completion filter can silently stop matching after an action becomes `move_to`. | High | Planned | Phase 16 canonicalizes old queue/rule movement actions and `action_finished.params.action_type` filters before validation, while preserving actor IDs, waypoint positions, action order, and rule IDs. Verify old scenes at the boundary and retain the `StickmanRig.walk_to` scripting facade. See `docs/specs/phase_16_running_stickman.md`. (2026-10-03) |
 
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@@ -145,5 +147,6 @@ This document tracks known technical debt, optimization opportunities, and minor
 | 2026-10-01 | Comic Chain speech behavior revised after preview feedback (`docs/specs/speech_comic_chain_layout.md`): Comic chain is the third persistent **Show bubbles** choice and builds cumulatively, while Stack/Same spot remain placement actions. Entering the mode applies measured Stack positions. Later balloon connectors use blunt joins drawn behind predecessor frames; Think uses dots. Older `bubble_layout: comic_chain` payloads migrate to `arrangement: comic_chain`. |
 | 2026-10-03 | Speech bubble order badges now use selection-independent positions (`docs/specs/speech_badge_stability.md`). Badge clustering responds to actual proximity; Show Speech and Speech Style panels avoid the stable badge bounds instead of moving badges when selection changes. |
 | 2026-10-03 | Speech badge clusters now also form when bubble frames intersect. For overlapping bubbles, the sorted badge row anchors above the largest frame, preventing a smaller bubble's badge from appearing through the larger bubble's text. |
+| 2026-10-03 | Phase 16 Move To/Run architecture specification written for user sign-off (`docs/specs/phase_16_running_stickman.md`). Approved canonical `move_to` plus Walk/Run style, migration of old movement and completion-filter types, a short arrival settle, and visual verification across Ground, Ramp, Step, seams, edges, and existing fall/landing behavior. Logged #60 for duplicated gait phase facts and #61 for the migration boundary. No implementation code changed. |
 
 _End of Log_