Fix release pipeline: bakery.toml discovery and ECOSYSTEM_DIR on hestia

- Add bakery.toml describing the bakery binary as an installable product
- gen-index.sh: check DL_DIR/<pkg>/bakery.toml first (written by each
  product's release workflow), fall back to sibling checkout for local dev
- gen-index.sh: include bakery itself in the products list
- release.yml: use GITHUB_WORKSPACE instead of ECOSYSTEM_DIR (the
  bread-ecosystem runner IS the checkout, no separate clone needed)
- release.yml: copy bakery.toml to DL_DIR during artifact prep

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

scripts/gen-index.sh

@@ -16,6 +16,7 @@ OUT="${DL_DIR}/index.json"
 
 # Products are read from the registry. Each line is "name repo".
 products=(
+    "bakery          Breadway/bread-ecosystem"
     "bread           Breadway/bread"
     "breadbar        Breadway/breadbar"
     "breadbox        Breadway/breadbox"
@@ -72,9 +73,12 @@ build_package_json() {
         binaries_json="$(jq -n --argjson arr "${binaries_json}" --argjson e "${entry}" '$arr + [$e]')"
     done
 
-    # Read bakery.toml for this product from a co-located checkout if available,
-    # else use minimal defaults.
-    local bakery_toml="${SCRIPT_DIR}/../${name}/bakery.toml"
+    # Read bakery.toml: the release workflow copies it to DL_DIR alongside the
+    # binaries; fall back to a sibling checkout for local dev use.
+    local bakery_toml="${DL_DIR}/${name}/bakery.toml"
+    if [[ ! -f "${bakery_toml}" ]]; then
+        bakery_toml="${SCRIPT_DIR}/../${name}/bakery.toml"
+    fi
     local description=""
     local system_deps="[]"
     local bread_deps="[]"