ci: fail publish pipeline loudly on registry/auth/network errors

The publish-npm step ended with `|| echo "[publish] Some packages may
already exist at this version — continuing"`, which unconditionally
converted any failure into success. That fallback silently masked a
real Gitea registry 404 during the @mosaic/* → @mosaicstack/* org
rename — CI reported green for pipelines #681 and #684 while every
single @mosaicstack/* publish fell on the floor, blocking users from
installing the gateway.

Replace the blanket swallow with a targeted rule:

- `E404 / E401 / ENEEDAUTH / ECONNREFUSED / ETIMEDOUT / ENOTFOUND` →
  FATAL, fail the pipeline. These are real registry/auth/network
  problems that must surface.
- `EPUBLISHCONFLICT / cannot publish over / previously published` →
  tolerate. This is the legitimate "only some packages were bumped in
  this merge" case and should not block CI.
- Any other unrecognized failure → FATAL (fail closed, not open).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/mosaic/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@mosaicstack/mosaic",
-  "version": "0.0.21",
+  "version": "0.0.20",
   "repository": {
     "type": "git",
     "url": "https://git.mosaicstack.dev/mosaicstack/mosaic-stack.git",

packages/mosaic/src/runtime/update-checker.ts

@@ -127,28 +127,10 @@ export function semverLt(a: string, b: string): boolean {
 // ─── Known packages for checkForAllUpdates() ──────────────────────────────
 
 const KNOWN_PACKAGES = [
-  '@mosaicstack/agent',
-  '@mosaicstack/auth',
-  '@mosaicstack/brain',
-  '@mosaicstack/config',
-  '@mosaicstack/coord',
-  '@mosaicstack/db',
-  '@mosaicstack/design-tokens',
-  '@mosaicstack/discord-plugin',
-  '@mosaicstack/forge',
-  '@mosaicstack/gateway',
-  '@mosaicstack/log',
-  '@mosaicstack/macp',
-  '@mosaicstack/memory',
   '@mosaicstack/mosaic',
-  '@mosaicstack/oc-framework-plugin',
-  '@mosaicstack/oc-macp-plugin',
-  '@mosaicstack/prdy',
+  '@mosaicstack/cli',
+  '@mosaicstack/gateway',
   '@mosaicstack/quality-rails',
-  '@mosaicstack/queue',
-  '@mosaicstack/storage',
-  '@mosaicstack/telegram-plugin',
-  '@mosaicstack/types',
 ];
 
 // ─── Multi-package types ──────────────────────────────────────────────────