Load cutscenes directly from JSONC at runtime, fix asset bundling staleness

Cutscenes now parse their authored .jsonc straight into the runtime
cutsceneitem_t/pool representation via yyjson, instead of going through a
separate Python-compiled DCTS binary format - removes the whole
build/compile step and the byte-format contract between the Python
encoder and the C decoder, at the cost of a (still tiny, one-time)
parse per cutscene load.

Also fixes dusk.dsk going stale after a build: the old custom_command
depended on a CMake-configure-time file glob, which only re-detects
added/removed assets on the next configure and could miss edits
entirely. tools.asset.pack now always runs and decides for itself
(via a small manifest) whether anything actually needs repacking, so
asset changes are never missed regardless of add/edit/remove.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

assetsraw/cutscenes/initial.jsonc

@@ -1,69 +0,0 @@
-{
-  "items": [
-    // Boot check: make sure a save device is available before handing off
-    // to the main menu.
-    {
-      "type": "MODAL",
-      "title": "initial.checking_save.title",
-      "message": "initial.checking_save.message"
-    },
-    {
-      "type": "WAIT",
-      "seconds": 0.2
-    },
-    {
-      "type": "SAVE_DEVICE_CHECK",
-      "successMarker": "CONTINUE",
-      "failureMarker": "NO_DEVICE"
-    },
-
-    // No save device found - offer to retry or continue without saving.
-    {
-      "type": "MARKER",
-      "name": "NO_DEVICE"
-    },
-    {
-      "type": "MODAL_CLOSE"
-    },
-    {
-      "type": "MODAL_OPTIONS_MARKERS",
-      "title": "initial.no_device.title",
-      "message": "initial.no_device.message",
-      "options": [
-        {
-          "text": "initial.no_device.retry",
-          "marker": "RETRY"
-        },
-        {
-          "text": "initial.no_device.continue",
-          "marker": "CONTINUE"
-        }
-      ]
-    },
-
-    {
-      "type": "MARKER",
-      "name": "RETRY"
-    },
-    {
-      "type": "MODAL_CLOSE"
-    },
-    {
-      "type": "RESTART"
-    },
-
-    // Save device found (or continuing without one) - hand off to the
-    // main menu scene.
-    {
-      "type": "MARKER",
-      "name": "CONTINUE"
-    },
-    {
-      "type": "MODAL_CLOSE"
-    },
-    {
-      "type": "SCENE",
-      "sceneType": "MAIN_MENU"
-    }
-  ]
-}

assetsraw/cutscenes/main_menu.jsonc

@@ -1,104 +0,0 @@
-{
-  "items": [
-    // Runs immediately as soon as the main menu scene becomes active
-    // (see sceneMainMenuInit) - owns menu-wide ambience, then idles while
-    // the menu itself is shown and interacted with natively.
-    // {
-    //   "type": "AUDIO_PLAY",
-    //   "file": "audio/boa.mp3",
-    //   "channel": "BGM_0",
-    //   "volume": 1.0,
-    //   "pan": 0.0,
-    //   "looping": true
-    // },
-
-    {
-      "type": "IDLE"
-    },
-
-    // New Game pressed (sceneMainMenuStartGame jumps here via
-    // cutsceneGoTo) - check for a save device before loading slots.
-    {
-      "type": "MARKER",
-      "name": "NEW_GAME"
-    },
-    {
-      "type": "MODAL",
-      "title": "main_menu.checking_save.title",
-      "message": "main_menu.checking_save.message"
-    },
-    {
-      "type": "WAIT",
-      "seconds": 0.2
-    },
-    {
-      "type": "SAVE_DEVICE_CHECK",
-      "successMarker": "CONTINUE",
-      "failureMarker": "NO_DEVICE"
-    },
-
-    // No save device found - offer to retry or continue without saving.
-    // Retry jumps straight back to NEW_GAME rather than restarting the
-    // whole cutscene, so the BGM above isn't retriggered.
-    {
-      "type": "MARKER",
-      "name": "NO_DEVICE"
-    },
-    {
-      "type": "MODAL_CLOSE"
-    },
-    {
-      "type": "MODAL_OPTIONS_MARKERS",
-      "title": "main_menu.no_device.title",
-      "message": "main_menu.no_device.message",
-      "options": [
-        {
-          "text": "main_menu.no_device.retry",
-          "marker": "NEW_GAME"
-        },
-        {
-          "text": "main_menu.no_device.continue",
-          "marker": "CONTINUE"
-        }
-      ]
-    },
-
-    // Save device found - attempt to load all save slots.
-    {
-      "type": "MARKER",
-      "name": "CONTINUE"
-    },
-    {
-      "type": "MODAL_CLOSE"
-    },
-    {
-      "type": "SAVE_LOAD_ALL_SLOTS",
-      "successMarker": "LOADED",
-      "failureMarker": "LOAD_ERROR"
-    },
-
-    // Save data failed to load (e.g. corrupt/unreadable) - only option is
-    // to retry, no "continue without saving" here since we already know a
-    // device is present.
-    {
-      "type": "MARKER",
-      "name": "LOAD_ERROR"
-    },
-    {
-      "type": "MODAL_OPTIONS_MARKERS",
-      "title": "main_menu.save_load_error.title",
-      "message": "main_menu.save_load_error.message",
-      "options": [
-        {
-          "text": "main_menu.save_load_error.retry",
-          "marker": "NEW_GAME"
-        }
-      ]
-    },
-
-    {
-      "type": "MARKER",
-      "name": "LOADED"
-    }
-  ]
-}