[ytspar]

What

Adds an opt-in, pluggable capture-sink system to the Sweetlink daemon. Every capture artifact the screenshot handler saves locally (screenshot JPG, metrics JSON, console logs text+JSON, a11y report) can now also be fanned out to remote storage.

Configuration

Env var SWEETLINK_CAPTURE_SINKS — a JSON array:

[
  {"type":"s3","bucket":"captures","prefix":"devbar",
   "endpoint":"https://<account>.r2.cloudflarestorage.com","region":"auto",
   "accessKeyId":"...","secretAccessKey":"..."},
  {"type":"http","url":"https://example.com/hook","headers":{"authorization":"Bearer ..."}},
  {"type":"module","path":"./my-gdrive-sink.mjs"}
]

Sink types

• s3 — any S3-compatible service (AWS S3, Cloudflare R2, MinIO, DigitalOcean Spaces) via a zero-dependency SigV4 PUT — no new package dependencies. endpoint for non-AWS services; {bucket} placeholder for virtual-hosted endpoints; region: "auto" for R2.
• http — POST raw bytes with x-capture-filename/x-capture-kind headers to any webhook (generic receivers, Google Apps Script → Drive, the Factory workspace drain host); surfaces a permanent link from a {"url"} body or Location header.
• module — dynamic import() of a user module exporting sink.upload(artifact) — the "whatever else" escape hatch (real Google Drive OAuth sink, Dropbox, internal CDN, …) in ~10 lines.

Semantics

Sinks are best-effort fan-out: the local disk save is unchanged and remains the source of truth; sink failures log ([Sweetlink] Capture sink "x" failed…) and never block or fail the browser response; one malformed config never disables the others.

Validation

• 20 new tests (env parsing, SigV4 credential scope/signed-headers vector, R2-style + {bucket} endpoint URL construction, live local HTTP server round-trip, module sinks incl. default export, dispatcher failure isolation).
• tsc --noEmit clean; the only full-suite failures reproduce on a clean tree (load-related flakes in playground/auto tests); all touched-area suites pass.
• Release note for the computed 1.29.0 added (release-notes gate).

Downstream

Enables the DEV-14160 slice "Devbar capture persistence": a factory workspace sets SWEETLINK_CAPTURE_SINKS with an http sink pointed at the workspace drain host — captures taken on a wip preview become durable instead of landing on the container's ephemeral disk.