fix(ci): correct image digest separator

.wave/pipelines/ops-implement-epic.yaml

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+# Epic Runner — Composition Primitives Example
+#
+# Demonstrates: iterate (sequential), gate (ci_pass), forge template variables
+#
+# Execution flow:
+#
+#   fetch-children          ← persona step: fetch parent issue, emit child URLs as JSON
+#        │
+#   implement-children      ← iterate (sequential): runs impl-issue for each child URL
+#        │
+#   ci-gate                 ← gate (ci_pass): block until CI is green across all PRs
+#        │
+#   summarise               ← persona step: post a completion comment on the epic
+
+kind: WavePipeline
+metadata:
+  name: ops-implement-epic
+  description: "Implement all child issues from a parent epic, gate on CI, then summarise"
+  category: composition
+  release: true
+
+requires:
+  tools:
+    - gh
+
+input:
+  source: cli
+  example: "https://github.com/re-cinq/wave/issues/184"
+  schema:
+    type: string
+    description: "Parent epic URL (e.g. https://github.com/owner/repo/issues/N)"
+
+steps:
+  # ── Step 1: fetch parent issue, emit child issue URLs ─────────────────────
+  - id: fetch-children
+    persona: "gitea-analyst"
+    workspace:
+      mount:
+        - source: ./
+          target: /project
+          mode: readonly
+    exec:
+      type: prompt
+      source: |
+        Input: {{ input }}
+
+        You are given a parent epic URL. Your job is to extract all child issue URLs
+        listed in the epic body.
+
+        1. Parse the URL to get repo (owner/repo) and issue number.
+        2. Fetch the issue:
+           {{ forge.cli_tool }} issue view <NUMBER> --repo <REPO> \
+             --json number,title,body,url
+        3. Scan the body for linked child issues. Look for patterns like:
+           - Checkbox lists: `- [ ] #123` or `- [ ] https://github.com/…/issues/123`
+           - "Closes #N" / "Part of #N" references
+           - Bulleted task lists pointing to issue URLs
+        4. For each child issue URL found, verify it is open:
+           {{ forge.cli_tool }} issue view <NUMBER> --repo <REPO> --json state,url
+           Include only open issues.
+        5. Output a JSON object with:
+           {
+             "parent_url": "<epic_url>",
+             "repo": "<owner/repo>",
+             "child_urls": ["https://…/issues/N", …]
+           }
+
+        Write this JSON to .wave/output/epic-children.json.
+    output_artifacts:
+      - name: children
+        path: .wave/output/epic-children.json
+        type: json
+        required: true
+    retry:
+      policy: aggressive
+      max_attempts: 2
+    handover:
+      contract:
+        type: json_schema
+        source: .wave/output/epic-children.json
+        schema_path: .wave/contracts/epic-children.schema.json
+        must_pass: true
+        on_failure: retry
+
+  # ── Step 2: iterate over child issues, run impl-issue for each ───────────
+  - id: implement-children
+    dependencies: [fetch-children]
+    pipeline: impl-issue
+    input: "{{ item }}"
+    iterate:
+      over: "{{ fetch-children.output.child_urls }}"
+      mode: sequential
+      max_concurrent: 3
+
+  # ── Step 3: gate — wait for CI to pass across all opened PRs ─────────────
+  - id: ci-gate
+    dependencies: [implement-children]
+    gate:
+      type: ci_pass
+      timeout: 2h
+      message: "Waiting for CI to pass on all PRs opened by child-issue implementations"
+
+  # ── Step 4: post a summary comment on the parent epic ────────────────────
+  - id: summarise
+    persona: "gitea-commenter"
+    dependencies: [ci-gate]
+    memory:
+      inject_artifacts:
+        - step: fetch-children
+          artifact: children
+          as: epic_children
+    workspace:
+      mount:
+        - source: ./
+          target: /project
+          mode: readonly
+    exec:
+      type: prompt
+      source: |
+        Input: {{ input }}
+
+        All child issues have been implemented and CI has passed.
+
+        Read .wave/artifacts/epic_children to get the parent epic URL and repo.
+
+        Post a completion comment on the parent epic:
+        {{ forge.cli_tool }} issue comment <NUMBER> --repo <REPO> --body-file /tmp/summary.md
+
+        The comment should include:
+        - A completion header: "All child issues implemented — CI green"
+        - A checkbox list of every child URL that was processed (mark each done)
+        - A note to reviewers about next steps (merge the PRs in dependency order)
+
+        Write the comment body to /tmp/summary.md before posting.
+    output_artifacts:
+      - name: epic-summary
+        path: .wave/output/epic-summary.json
+        type: json
+    outcomes:
+      - type: url
+        extract_from: .wave/output/epic-summary.json
+        json_path: .comment_url
+        label: "Epic Summary Comment"
+    retry:
+      policy: aggressive
+      max_attempts: 2