DRAFT: explicit v1 Artist Context workflow node (first part of #252)

[JayceeB1]

Goal

First bounded, explicitly opt-in slice of upstream #252, originally contributed by @OmarB97. This stacks on our PR #5 and does not change fork main or the upstream.

The original lightningpixel#252 mixes immutable artist-intent records, automatic multi-stage propagation, live texture reload, viewer UI changes and proof assets. Here we isolate the modly.intent.v1 recording and carry contract to test safely before changing core workflows.

Included

• Built-in intent-travel process extension with Remember Artist Context (image → staged image + sidecar) and Carry Artist Context (asset with existing intent + distinct existing workspace destination asset).
• Stable intent_id, artist words, project/style/movement facts, stage events, source-image basename, conflict-checking and append-only-style history merge. Each start captures a new request instead of overwriting prior records.
• Prevent writing or reading the destination outside the real workspace. Refuse symlinked metadata sidecars and staging directories that escape the workspace; cap image size at 64 MiB and sidecars at 1 MiB.
• Add 9 Node regression test cases to npm run test:node for staging, intent identity/carry, outside or missing destinations, source type, conflicting intent, size caps, and link escapes.
• Builtins TypeScript compiler includes the new extension.

Excluded by design

• No automatic interception of all image→model workflows. Generated meshes do not yet automatically inherit an image's intent record. The carry action only works on a source asset that already contains the record.
• No live texture hot reload, watcher, UI replacement, or proof images from Carry artist intent through generated assets lightningpixel/modly#252.
• No claim that a multi-stage production automatically retains creative intent yet.

Verification

• Source is isolated in a review branch with a documented scope and ledger.
• Regression tests are written and wired into the Node suite.
• Targeted tests with installed repository dependencies and overall lint/typecheck/build.
• End-to-end Electron/Windows workflow test including a real source image, generated GLB, and conflicts.
• Security review, including filesystem races and externally modified user data.

Detailed scope and limitations: docs/experimental-artist-intent.md.
Other integrations: docs/experimental-library-integration-ledger.md.

Draft only. Do not merge to a releasable branch or run against valuable storage until the combined validation gates pass.