feat: initial public release of ComfyUI-Imagent

BYOK OpenAI gpt-image generation and editing nodes for ComfyUI — calls go
directly to the OpenAI API with your own key (no proxy, no credit markup).

- Two nodes: "Imagent: OpenAI Image" (text-to-image) and "Imagent: OpenAI
  Image Edit" (edit / inpaint / multi-reference compose).
- Models gpt-image-2 / gpt-image-1.5 / gpt-image-1 with a per-model dynamic UI
  (comfy_api DynamicCombo): size, background, custom WxH, and input_fidelity
  are revealed only for the models that support them.
- Edit node accepts an auto-growing set of reference images (up to 16) plus an
  optional inpaint mask; generate supports batches up to 8.
- API key via OPENAI_API_KEY or a local config.json.

Requires ComfyUI >= 0.23.0.

.github/workflows/publish.yml

@@ -0,0 +1,63 @@
+name: Publish to ComfyUI Registry
+
+on:
+  push:
+    tags: ["v*"]
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Existing tag whose changelog to (re)sync, e.g. v0.1.0 (skips re-publish)"
+        required: true
+
+permissions:
+  contents: read
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    env:
+      COMFY_API_KEY: ${{ secrets.COMFY_API_KEY }}
+      PUBLISHER_ID: agarzon
+      NODE_ID: comfyui-imagent
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          ref: ${{ github.event.inputs.tag || github.ref_name }}
+
+      - uses: actions/setup-python@v6
+        with:
+          python-version: "3.12"
+
+      - name: Publish to ComfyUI Registry
+        if: github.event_name == 'push' && env.COMFY_API_KEY != ''
+        run: |
+          pip install comfy-cli
+          comfy node publish --token "$COMFY_API_KEY"
+
+      - name: Sync version changelog to the Registry
+        if: env.COMFY_API_KEY != ''
+        env:
+          TAG_INPUT: ${{ github.event.inputs.tag }}
+        run: |
+          TAG="${TAG_INPUT:-$GITHUB_REF_NAME}"
+          v="${TAG#v}"
+          awk -v v="$v" '
+            $0 ~ "^## v?" v " " { f=1; next }
+            f && /^## / { exit }
+            f { print }
+          ' CHANGELOG.md > changelog.md
+          if [ ! -s changelog.md ]; then
+            echo "No CHANGELOG section found for $v" >&2
+            exit 1
+          fi
+          body=$(jq -Rs '{changelog: ., deprecated: false}' < changelog.md)
+          code=$(curl -sS -o resp.json -w '%{http_code}' -X PUT \
+            "https://api.comfy.org/publishers/$PUBLISHER_ID/nodes/$NODE_ID/versions/$v" \
+            -H "Authorization: Bearer $COMFY_API_KEY" \
+            -H "Content-Type: application/json" \
+            -d "$body")
+          echo "HTTP $code"; cat resp.json; echo
+          case "$code" in
+            2*) echo "Changelog synced for $v" ;;
+            *) echo "Failed to sync changelog (HTTP $code)" >&2; exit 1 ;;
+          esac

.github/workflows/release.yml

@@ -0,0 +1,45 @@
+name: Release
+
+on:
+  push:
+    tags: ["v*"]
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Existing tag to (re)release, e.g. v0.1.0"
+        required: true
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Resolve tag and extract its CHANGELOG section
+        id: notes
+        env:
+          TAG_INPUT: ${{ github.event.inputs.tag }}
+        run: |
+          TAG="${TAG_INPUT:-$GITHUB_REF_NAME}"
+          v="${TAG#v}"
+          echo "tag=$TAG" >> "$GITHUB_OUTPUT"
+          awk -v v="$v" '
+            $0 ~ "^## v?" v " " { f=1; next }
+            f && /^## / { exit }
+            f { print }
+          ' CHANGELOG.md > release-notes.md
+          if [ ! -s release-notes.md ]; then
+            echo "No CHANGELOG section found for $v" >&2
+            exit 1
+          fi
+          cat release-notes.md
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v3
+        with:
+          tag_name: ${{ steps.notes.outputs.tag }}
+          name: ${{ steps.notes.outputs.tag }}
+          body_path: release-notes.md