feat(#1): split publish into release and dev channels

- publish-release (main): publishes package.json version as-is with
  'latest' dist-tag, skips if version already published
- publish-dev (develop): publishes {version}-dev.{timestamp} with
  'dev' dist-tag, every push gets a unique prerelease version

Install channels:
  npm install @mosaicstack/telemetry-client        # latest stable
  npm install @mosaicstack/telemetry-client@dev     # latest dev build

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.woodpecker.yml

@@ -57,7 +57,7 @@ steps:
       - security-audit
       - test
 
-  publish:
+  publish-release:
     image: *node_image
     environment:
       GITEA_TOKEN:
@@ -68,8 +68,8 @@ steps:
         echo "//git.mosaicstack.dev/api/packages/mosaic/npm/:_authToken=$$GITEA_TOKEN" > .npmrc
         echo "@mosaicstack:registry=https://git.mosaicstack.dev/api/packages/mosaic/npm/" >> .npmrc
       - |
-        CURRENT=$(node -p "require('./package.json').version")
-        PUBLISHED=$(npm view @mosaicstack/telemetry-client version 2>/dev/null || echo "0.0.0")
+        CURRENT=$$(node -p "require('./package.json').version")
+        PUBLISHED=$$(npm view @mosaicstack/telemetry-client version 2>/dev/null || echo "0.0.0")
         if [ "$$CURRENT" = "$$PUBLISHED" ]; then
           echo "Version $$CURRENT already published, skipping"
           exit 0
@@ -77,11 +77,35 @@ steps:
         echo "Publishing $$CURRENT (was $$PUBLISHED)"
         npm publish --access public
     when:
-      - branch: [main, develop]
+      - branch: main
         event: [push, manual, tag]
     depends_on:
       - build
 
+  publish-dev:
+    image: *node_image
+    environment:
+      GITEA_TOKEN:
+        from_secret: gitea_token
+      CI_COMMIT_SHA: ${CI_COMMIT_SHA}
+    commands:
+      - npm run build
+      - |
+        echo "//git.mosaicstack.dev/api/packages/mosaic/npm/:_authToken=$$GITEA_TOKEN" > .npmrc
+        echo "@mosaicstack:registry=https://git.mosaicstack.dev/api/packages/mosaic/npm/" >> .npmrc
+      - |
+        BASE=$$(node -p "require('./package.json').version")
+        TIMESTAMP=$$(date -u +%Y%m%d%H%M%S)
+        DEV_VERSION="$${BASE}-dev.$${TIMESTAMP}"
+        echo "Publishing dev version $$DEV_VERSION"
+        node -e "const p=require('./package.json'); p.version='$$DEV_VERSION'; require('fs').writeFileSync('package.json', JSON.stringify(p, null, 2)+'\n')"
+        npm publish --access public --tag dev
+    when:
+      - branch: develop
+        event: [push, manual]
+    depends_on:
+      - build
+
   link-package:
     image: alpine:3
     environment:
@@ -115,4 +139,5 @@ steps:
       - branch: [main, develop]
         event: [push, manual, tag]
     depends_on:
-      - publish
+      - publish-release
+      - publish-dev