feat!: remove zcashd support entirely

.env.testing-artifacts

@@ -2,10 +2,7 @@
 # rust-toolchain.toml's `channel`; consumers derive it via
 # the workbench get-rust-version bin.
 
-# zcashd Git tag (https://github.com/zcash/zcash/releases)
-ZCASH_VERSION=6.20.0
-
-ZEBRA_VERSION=6.0.0-rc.0
+ZEBRA_VERSION=6.0.0
 
 # zcash-devtool git ref (https://github.com/zingolabs/zcash-devtool) —
 # the wallet client driven by wallet-tests via zcash_local_net, built

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -70,7 +70,7 @@ body:
       description: |
         Please include:
         - Zaino version or commit hash
-        - Backend version (zebra/zcashd)
+        - Backend version (zebra)
         - OS and platform
       placeholder: |
         Zaino: v0.x.x or commit abc123

.github/workflows/build-n-push-ci-image.yaml

@@ -38,7 +38,7 @@ jobs:
       run: |
         source .env.testing-artifacts
         RUST_VERSION=$(cargo run -q --manifest-path tools/workbench/Cargo.toml --bin get-rust-version)
-        export RUST_VERSION ZCASH_VERSION ZEBRA_VERSION DEVTOOL_VERSION
+        export RUST_VERSION ZEBRA_VERSION DEVTOOL_VERSION
         TAG=$(./tools/scripts/get-ci-image-tag.sh)
         echo "tag=$TAG" >> "$GITHUB_OUTPUT"
 
@@ -55,7 +55,6 @@ jobs:
         ZEBRA_GIT_REF=$(cargo run -q --manifest-path tools/workbench/Cargo.toml --bin get-zebra-git-ref -- "$ZEBRA_VERSION")
         echo "sha_short=$(git rev-parse --short HEAD)" >> "$GITHUB_OUTPUT"
         echo "RUST_VERSION=$RUST_VERSION" >> "$GITHUB_ENV"
-        echo "ZCASH_VERSION=$ZCASH_VERSION" >> "$GITHUB_ENV"
         echo "ZEBRA_VERSION=$ZEBRA_VERSION" >> "$GITHUB_ENV"
         echo "ZEBRA_GIT_REF=$ZEBRA_GIT_REF" >> "$GITHUB_ENV"
         echo "DEVTOOL_VERSION=$DEVTOOL_VERSION" >> "$GITHUB_ENV"
@@ -65,7 +64,7 @@ jobs:
       run: |
         set -a
         source ./tools/scripts/helpers.sh
-        TARGET=$(resolve_build_target ${{ env.ZCASH_VERSION }} ${{ env.ZEBRA_VERSION }})
+        TARGET=$(resolve_build_target ${{ env.ZEBRA_VERSION }})
         echo "target=$TARGET" >> "$GITHUB_OUTPUT"
 
     - name: Build and Push Docker Image
@@ -82,7 +81,6 @@ jobs:
         push: ${{ github.event_name != 'workflow_dispatch' || inputs.push }}
         build-args: |
           RUST_VERSION=${{ env.RUST_VERSION }}
-          ZCASH_VERSION=${{ env.ZCASH_VERSION }}
           ZEBRA_VERSION=${{ env.ZEBRA_VERSION }}
           ZEBRA_GIT_REF=${{ env.ZEBRA_GIT_REF }}
           DEVTOOL_VERSION=${{ env.DEVTOOL_VERSION }}

.github/workflows/ci.yml

@@ -101,38 +101,6 @@ jobs:
   compute-tag:
     uses: ./.github/workflows/compute-tag.yml
 
-  no-zcashd-build:
-    name: No-zcashd build (--no-default-features)
-    # The default-on `zcashd_support` feature is being deprecated; its OFF
-    # state must keep compiling or the deprecation path bit-rots. Runs in the
-    # CI container (toolchain + git deps + cargo cache) like the build job, so
-    # it is skipped on PRs until a self-hosted runner is available — same as the
-    # other compiling jobs. See docs/adr/0001-zcashd-support-feature-gate.md.
-    needs: compute-tag
-    container:
-      image: docker.io/zingodevops/zaino-ci:${{ needs.compute-tag.outputs.image-tag }}
-    runs-on: arc-sh-runners
-    if: github.event_name != 'pull_request' && github.event.pull_request.draft == false
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v7
-
-      - name: Restore cargo dependencies
-        uses: tespkg/actions-cache/restore@v1
-        with:
-          endpoint: ${{ env.CACHE_ENDPOINT }}
-          port: ${{ env.CACHE_PORT }}
-          bucket: ${{ env.CACHE_BUCKET }}
-          insecure: ${{ env.INSECURE_CACHE }}
-          key: cargo-deps-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: cargo-deps-
-          path: |
-            ~/.cargo
-            target/debug/deps
-
-      - name: Check no-zcashd build across all three workspaces
-        run: makers check-no-zcashd
-
   build-test-artifacts:
     name: Build test artifacts
     needs: compute-tag
@@ -166,8 +134,6 @@ jobs:
         # test crates' own dependency declarations and survive feature
         # unification, so the harness still functions. This deliberately omits
         # the product features `--all-features` was speculatively enabling:
-        #   - zcashd_support (opt-in; docs/adr/0001, 0005): zcashd is being
-        #     deprecated; zcashd-backed tests cfg out and are not executed in CI.
         #   - experimental_features / transparent_address_history_experimental:
         #     not shipped on by default; CI should not gate on a non-release combo.
         #   - prometheus.
@@ -211,11 +177,10 @@ jobs:
           # - "clientless::chain_cache"  # disabled: timeouts/hangs pending chain-index
           #   integration; re-enable per https://github.com/zingolabs/zaino/issues/1312
           - "clientless::fetch_service"
-          - "clientless::json_server"
           - "clientless::state_service"
           - "clientless::test_vectors"
-          # NOTE: the e2e partition (e2e::devtool, e2e::devtool_zcashd,
-          # e2e::test_vectors) now lives in the unified --workspace archive and
+          # NOTE: the e2e partition (e2e::devtool, e2e::test_vectors) now
+          # lives in the unified --workspace archive and
           # is compiled every run, but is intentionally NOT executed here —
           # adding the validator-heavy e2e suite to this job is a CI-capacity
           # decision tracked in https://github.com/zingolabs/zaino/issues/1308.

.github/workflows/compute-tag.yml

@@ -22,7 +22,7 @@ jobs:
         run: |
           source .env.testing-artifacts
           RUST_VERSION=$(cargo run -q --manifest-path tools/workbench/Cargo.toml --bin get-rust-version)
-          export RUST_VERSION ZCASH_VERSION ZEBRA_VERSION DEVTOOL_VERSION DOCKER_DIR_HASH
+          export RUST_VERSION ZEBRA_VERSION DEVTOOL_VERSION DOCKER_DIR_HASH
           TAG=$(./tools/scripts/get-ci-image-tag.sh)
           echo "TAG=$TAG"
           echo "tag=$TAG" >> "$GITHUB_OUTPUT"

CONTRIBUTING.md

@@ -77,7 +77,7 @@ Error handling must be included and expose underlying information as much as and
 
 Merges must minimally reflect the zcash RPC spec and include a link to the relevant zcash C++ implementation (URLs that point at the analogous logic), OR reflect the C++ implementation.
 
-Tests are encouraged that show parity bewteen responses from `zcash-cli` + `zcashd` and `zaino`+ a `zebra` backend, and the local cache.
+Tests are encouraged that show parity between responses from `zaino` + a `zebra` backend and the local cache.
 
 ## Local Testing
 Local testing requires a system with ample resources, particularly RAM.