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Aamer Akhter
f1c64994ad
Adds the foundation for serving local files to the browser as live external attachments with a stable id, so requests never carry arbitrary absolute paths. - attachment-registry: in-memory, session-scoped registry. registerExternalAttachment validates an absolute path, resolves symlinks, enforces the path guard, and mints an `att_<uuid>` id; records are cleared when the session is removed. - attachment path guard: a configurable blocklist (secret locations + /root,/etc trees, extendable via attachmentBlockedPaths / CODEMAN_ATTACHMENT_BLOCKED_PATHS) plus an optional, default-off workspace-confinement mode. Shares one sensitive-path blocklist (web/sensitive-path.ts) with /api/download, which is refactored to use the extracted module instead of an inline copy. - terminal magic links: the session scans output for codeman://attach?path=... and emits `attachmentRequested`; the web server registers the file and broadcasts an `attachment:detected` SSE event. `codeman attach <path>` (CLI) prints the magic link or POSTs directly when a session id is known. - image watcher: detects png/pdf/docx/pptx dropped into a session's working dir and emits `attachment:detected`. - routes: POST /api/sessions/:id/attachments (register) and GET /api/sessions/:id/attachments/:attachmentId/raw (serve), both re-checking the guard before streaming. Document previews/thumbnails and the attachment-history drawer build on this foundation and land separately. Verified: tsc --noEmit, lint, format, frontend-syntax, full test:ci (2846 passed), and a server boot smoke (/api/status 200).