ci: default PRODUCT_NAME to repo name (caught by template dispatch test)

First dispatch on the empty template failed at Chroma collection
creation because PRODUCT_NAME was the literal string "<product>"
(YAML doesn't expand placeholders), and Chroma rejects collection
names containing characters outside [a-zA-Z0-9._-]:

  chromadb.errors.InvalidArgumentError: Validation error: name:
  Expected a name containing 3-512 characters from [a-zA-Z0-9._-],
  starting and ending with a character in [a-zA-Z0-9]. Got:
  <product>_docs

Same fix as the IMAGE env: derive from the repo name dynamically
via ${{ github.event.repository.name }}. Cloners can still override
explicitly, but a fresh clone now runs the index-rebuild step
cleanly out of the box.

Verified by re-dispatch — should fail next at docker login (placeholder
REGISTRY_PUSH hostname), which is the next-expected fail point and a
real per-deployment config the cloner has to fill in.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/image-only.yml

@@ -23,7 +23,12 @@ env:
   IMAGE: ${{ github.repository_owner }}/${{ github.event.repository.name }}
   OLLAMA_URL: http://<gpu-host>:11434
   EMBED_MODEL: nomic-embed-text
-  PRODUCT_NAME: <product>
+  # PRODUCT_NAME defaults to the repo name so a clone works without
+  # editing. Override here if you want a different identifier (e.g.
+  # repo "my-product-docs" → PRODUCT_NAME "myproduct"). Used as the
+  # Chroma collection name, BM25 db filename, and MCP server name —
+  # see docs_mcp/server.py.
+  PRODUCT_NAME: ${{ github.event.repository.name }}
 
 jobs:
   build:

.gitea/workflows/refresh.yml

@@ -34,7 +34,12 @@ env:
   OLLAMA_URL: http://<gpu-host>:11434
   EMBED_MODEL: nomic-embed-text
 
-  PRODUCT_NAME: <product>
+  # PRODUCT_NAME defaults to the repo name so a clone works without
+  # editing. Override here if you want a different identifier (e.g.
+  # repo "my-product-docs" → PRODUCT_NAME "myproduct"). Used as the
+  # Chroma collection name, BM25 db filename, and MCP server name —
+  # see docs_mcp/server.py.
+  PRODUCT_NAME: ${{ github.event.repository.name }}
 
 jobs:
   refresh: