Newsence Core Worker

HTTP endpoints (frontend):
GET  /health
POST /ingest                              - Ingest URL (JSON), image URL (JSON), or user-uploaded blob (multipart)
POST /scrape                              - Sync extraction: {url} JSON or raw bytes -> NormalizedContent {markdown,text,metadata,status}
POST /scrape/jobs                         - Async parse job (non-persisting): {url} or raw bytes -> {jobId}
GET  /scrape/jobs/:id                     - Poll parse job -> {status, result?, error?}
POST /search                              - Hybrid corpus ranking (internal token) -> {success,data:{results}}
POST /search/related                      - pgvector neighbours of a seed (internal token) -> {success,data:{ids}}
POST /media/delete                        - Batch-delete user-file R2 objects by storage key (#162) -> {success,data}
GET  /stream/:instanceId                  - Workflow status (SSE, internal token)

Signed media:
GET  /media/external/{options}/{mediaUrl} - Upstream image/video passthrough with edge cache
GET  /media/asset/{key}?sig=&exp=         - Authenticated R2 asset