Add Director authoring, import previews and scene bundles

docs/DIRECTOR-SHARING.md

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+# Director authoring and file sharing
+
+Open Scenes and select a scene and shot. Existing capture, update, playback and
+whole-project export controls remain available. Authored scene content, source
+links, assets and contributor credit are preserved.
+
+## Review imports before applying
+
+IMPORT accepts scene JSON (including older supported versions) or a
+`.gevbundle.json` asset bundle. A preview lists scenes, shots, data-pack attribution,
+configured or unavailable sources, missing layer IDs and bundled bytes. Preview
+makes no asset requests and does not change the current project. Configured
+sources do not guarantee that a file exists: ordinary assets are checked on LOAD.
+Bundle preview verifies the manifest and byte integrity; format decoding and
+geometry limits are still enforced when rendering.
+
+Apply replaces the current project after validation and playback cleanup. Export
+your current project first if you want to keep both. Cancel or Escape discards
+the staged import. A changed project invalidates an open draft rather than being
+overwritten. Invalid files leave the existing project and browser save intact.
+The programmatic `importProjectFile(file)` API still applies trusted callers'
+imports directly; the installed file chooser supplies the review step.
+
+## Edit scene details
+
+EDIT DETAILS provides validated JSON fields for:
+
+- Scene anchors and data-pack manifests.
+- The selected shot's camera, optional move, duration, hold, pack IDs and actions.
+
+Capture camera as anchor adds a named geographic position to the draft. Set move
+start to current camera creates a pose-to-pose move ending at the shot's existing
+camera; Use ordinary flight removes that explicit move. Heights are meters above
+the WGS84 ellipsoid. Apply details validates the complete project, preserves IDs,
+layer declarations and content notices, and keeps the selected shot. Cancel
+leaves the project unchanged. See [camera directions](DIRECTOR-CAMERA.md),
+[data packs](DIRECTOR-DATA-PACKS.md) and [actions](DIRECTOR-INTERACTIONS.md) for
+field definitions. This is a basic draft editor, not a node graph or path editor.
+
+## Share a selected scene
+
+SHARE SCENE exports only the selected scene. Download scene JSON preserves its
+camera, timing, layers, anchors, manifests, interactions and attribution, but
+contains no asset bytes. The recipient needs the referenced source registrations
+and files. Existing EXPORT PRESETS continues to export the entire project.
+
+For a bundle, select the declared pack files or a folder, then Download asset
+bundle. Folder paths match a manifest path either directly or after removing the
+chosen root directory. Individual filenames must be unambiguous across all pack
+sources; ambiguous or missing matches fail without downloading a partial bundle.
+Previously imported bundle files can be reused. Export never automatically fetches
+remote files or copies registered recipe media. Existing integrity declarations
+must match the files you supply.
+
+Bundles include only declared data-pack files. Registered scene content, linked
+media, map tiles and live data are not included. Source notices and licenses remain
+in the document; packaging a file does not grant permission to redistribute it.
+
+## Bundle format and limits
+
+A bundle is uncompressed JSON with these fields:
+
+```json
+{
+  "format": "gev-scene-bundle",
+  "version": 1,
+  "project": { "version": 6, "scenes": [] },
+  "assets": []
+}
+```
+
+Each asset contains `path`, `mimeType`, `base64` and lowercase hexadecimal `sha256`.
+Export copies the document and rewrites pack references to the reserved
+`scene-bundle` source, adding exact `byteLength` and `sha256`. Paths are confined
+relative names; URLs, traversal, duplicate or unreferenced assets, unknown fields,
+missing packs and mismatched hashes are rejected. Scene documents remain bounded
+at 5 MiB. A bundle allows 50 MiB of JSON, 64 files, 8 MiB per file and 32 MiB of
+asset bytes in total. Supported MIME types are JSON/GeoJSON, PNG, MP4/WebM video
+and MPEG/Ogg/WAV/WebM audio. Normal pack format and geometry checks still apply.
+There are no executable modules, request headers or credentials in the format.
+
+Imported bytes stay in memory for the current project and session. Stop releases
+rendered resources while retaining these bytes for replay. Project replacement
+or application teardown releases them. Only scene JSON is saved in browser
+storage: **reimport the bundle after reloading the app**. Missing bundle bytes
+fail explicitly, with no network fallback. This is file sharing, not a storage
+service or an offline basemap.
+
+Portable helpers are exported through `gods-eye-view/director`: `parseSceneShare`,
+`readSceneShare`, `createSceneBundle`, `createBundleAssets`, `describeSceneShare`,
+`editSceneDetails` and `selectSceneDocument`. Loading and UI remain separate owners.
+`getSharingState()` reports copied dialog/asset counts for lifecycle diagnostics.
+
+Run `node scripts/qa-director-sharing.mjs` against the local server for installed
+controls, cancellation, stale drafts, export/import round trips, resource cleanup
+and narrow-screen acceptance. Fixtures are synthetic and carry their own notices.