ci: auto-trigger KMP publish on release; fix broken CI badge

The KMP artifact's tag->publish automation never fired. create_tag.yml
creates the release/tag with the default GITHUB_TOKEN, and GitHub
deliberately suppresses `push: tags` triggers for refs created by
GITHUB_TOKEN — so publish-kmp.yml only ever ran via manual
workflow_dispatch (v2.7.26 was published by hand).

Fix without adding a secret: create_tag.yml now explicitly dispatches
publish-kmp.yml after creating the release (workflow_dispatch is exempt
from the GITHUB_TOKEN trigger suppression), passing the new version.
Adds `actions: write` so `gh workflow run` can dispatch it. The existing
`push: tags` trigger on publish-kmp.yml is kept as a fallback for tags
pushed with a user/PAT credential.

Also fix the root README CI badge, which pointed at a nonexistent
ci.yml, to the actual pull_request.yml workflow.

Part of the Meshtastic KMP library standard alignment (P0: release
reliability + docs accuracy).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: jamesarich

.github/workflows/create_tag.yml

@@ -2,6 +2,7 @@ name: Create tag
 
 permissions:
   contents: write
+  actions: write
 
 on:
   workflow_dispatch:
@@ -57,6 +58,14 @@ jobs:
           generateReleaseNotes: true
           token: ${{ github.token }}
 
+      # Tags created via GITHUB_TOKEN do not fire `push: tags` triggers, so
+      # publish-kmp.yml never ran automatically. Dispatch it explicitly
+      # (workflow_dispatch is exempt from the GITHUB_TOKEN trigger suppression).
+      - name: Trigger KMP publish workflow
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: gh workflow run publish-kmp.yml -f version=${{ steps.version.outputs.NEW_VERSION }}
+
       - name: Setup Buf
         uses: bufbuild/buf-action@v1.4.0
         with:

README.md

@@ -1,6 +1,6 @@
 # Meshtastic Protobuf Definitions
 
-[![CI](https://img.shields.io/github/actions/workflow/status/meshtastic/protobufs/ci.yml?branch=master&label=actions&logo=github&color=yellow)](https://github.com/meshtastic/protobufs/actions/workflows/ci.yml)
+[![CI](https://img.shields.io/github/actions/workflow/status/meshtastic/protobufs/pull_request.yml?branch=master&label=actions&logo=github&color=yellow)](https://github.com/meshtastic/protobufs/actions/workflows/pull_request.yml)
 [![CLA assistant](https://cla-assistant.io/readme/badge/meshtastic/protobufs)](https://cla-assistant.io/meshtastic/protobufs)
 [![Fiscal Contributors](https://opencollective.com/meshtastic/tiers/badge.svg?label=Fiscal%20Contributors&color=deeppink)](https://opencollective.com/meshtastic/)
 [![Vercel](https://img.shields.io/static/v1?label=Powered%20by&message=Vercel&style=flat&logo=vercel&color=000000)](https://vercel.com?utm_source=meshtastic&utm_campaign=oss)