feat(builder): query CI via project status script

When BUILD_VENUE=ci, init confirms tea/glab/gh/curl (or a custom
command) and writes .pouch/builder/ci-status.sh. wait_ci.sh only
polls that script and no longer guesses forge CLIs.

skills/builder/templates/env.builder

@@ -11,8 +11,7 @@
 # DOCKER_REPOSITORY=
 # IMAGE_TAG=
 # PLATFORMS=          # optional override; project ARCHES lives in makefile.builder
-# BUILDER_CI_FORGE=   # optional: github, gitlab, or gitea; useful for custom hosts
-# GITEA_API_URL=      # optional: defaults to https://<origin-host>/api/v1
+# GITEA_API_URL=      # optional for the curl CI status script
 # GITEA_TOKEN=        # optional token for private Gitea repositories
 # COPY_DEST=          # fallback: local dir, or docker dest container:/absolute/dir
 # COPY_SCRIPT=                              # external/temporary executable override; project-local paths belong in makefile.builder