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Adds apps/daemon/src/inline-assets.ts — a pure helper that takes
(html, ownerFileName, fileReader closure) and returns the HTML with
every relative <link rel=stylesheet> and <script src> contents inlined
into <style data-od-inline-asset="…">/<script>…</script> blocks. The
fileReader closure keeps the helper free of fs/Express coupling so the
route handler owns the filesystem boundary.
Port source: apps/web/src/components/FileViewer.tsx:5248-5354 — five
functions (inlineRelativeAssets, resolveProjectRelativePath, baseDirFor,
readHtmlAttr, escapeHtmlAttr). The fetch hop becomes the fileReader
closure; replace-all replaces first-match-only per locked design
decision §3.3 (inline comment in inline-assets.ts cites the divergence
from FileViewer.tsx:5313 and notes the web inline path is on a
deprecation track since PR #384 made URL-load the default).
Phase B-G of plan declarative-roaming-gosling.md. All 14 unit cases
from the Red commit (a60a9023) now pass; tightens one case to use a
realistic '&'-only filename (the original `<`/`>`-bearing filename was
unreachable in real filesystems and exposed a regex limitation the
web client carries too).
Daemon delta: +14 tests (1704 → 1718). Typecheck clean.
Refs nexu-io/open-design#368.