Two independent fixes hit while running the cold-topic-explainer demo
end-to-end.
1. observability/otel.go — schema URL conflict on Init
When SYNAPBUS_OTEL_ENABLED=1, Init() failed with:
observability: build resource: conflicting Schema URL:
https://opentelemetry.io/schemas/1.26.0 and
https://opentelemetry.io/schemas/1.21.0
resource.Default() ships with schema 1.26.0 (newer otel/sdk) but I
was passing semconv.SchemaURL from v1.21 into a NewWithAttributes
call. resource.Merge rejects that.
Fix: use resource.NewSchemaless for the service.* attributes so our
side of the merge has no schema URL and slots cleanly into whatever
Default provides. ServiceVersion is now only attached when non-empty
(avoids a stray service.version="" attribute).
Two new regression tests:
TestInit_EnabledSucceeds — Enabled=true with all fields set
TestInit_EnabledWithNoVersion — Enabled=true with empty version
Both point at an unroutable endpoint so the batcher never actually
exports; the bug reproduced during Init(), which is all we need.
2. examples/cold-topic-explainer/start.sh — rebuild embedded SPA
The Svelte Web UI loaded blank because internal/web/dist/ had a
mismatched index.html + stale _app/immutable/entry/ assets (a build
had updated index.html but not the chunks, so every asset URL fell
through to the SPA HTML fallback and the browser tried to execute
HTML as JavaScript).
The canonical path is `make web`, but start.sh never ran it, so a
working demo depended on the developer having run `make web` first.
Fix: start.sh now rebuilds the SPA when web/src is newer than the
embedded dist/index.html, using the already-installed
web/node_modules (no reinstall). Falls back with a "run make web
once" hint when node_modules isn't present. This keeps the fast
path fast (~2s vite build after cache warm) and eliminates the
silent-stale-dist trap.
E2E verified after both fixes:
* SYNAPBUS_OTEL_ENABLED=1 start.sh no longer crashes.
* `curl /_app/immutable/entry/start.*.js` returns real JavaScript
(Content-Type: text/javascript) instead of the index.html
fallback.
* Chrome-in-MCP navigation to http://localhost:18088/ renders the
login form with no SynapBus-originated console errors.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
