diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 398e86793d..ffdf17b352 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -77,6 +77,8 @@ jobs:
         run: scripts/test-release-ref-contract.sh
       - name: Private CA release workflow contract
         run: scripts/test-private-ca-release-contract.sh
+      - name: Sprig rolling release contract
+        run: scripts/test-publish-sprig-rolling-release.sh
       - name: Desktop release candidate contract
         run: scripts/test-desktop-release-candidate.sh
       - name: Mobile release contract
diff --git a/.github/workflows/sprig.yml b/.github/workflows/sprig.yml
index 5e50808b3b..791383a98f 100644
--- a/.github/workflows/sprig.yml
+++ b/.github/workflows/sprig.yml
@@ -131,19 +131,7 @@ jobs:
       - name: Update rolling release
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          REPO: ${{ github.repository }}
-          SHA: ${{ github.sha }}
-        run: |
-          set -euo pipefail
-          TAG="sprig-latest"
-          TITLE="Sprig (rolling)"
-          NOTES="Rolling Linux build of Sprig (all-in-one buzz-acp + buzz-agent + buzz-dev-mcp), tracking \`main\` (\`${SHA}\`)."
-
-          gh release edit "$TAG" \
-            --prerelease \
-            --title "$TITLE" \
-            --notes "$NOTES"
-          gh release upload "$TAG" dist/* --clobber
+        run: scripts/publish-sprig-rolling-release.sh
 
   publish-tag:
     name: Publish tagged release
diff --git a/docs/ci-sprig-rolling-release.md b/docs/ci-sprig-rolling-release.md
new file mode 100644
index 0000000000..41ea39bac8
--- /dev/null
+++ b/docs/ci-sprig-rolling-release.md
@@ -0,0 +1,55 @@
+# Sprig rolling-release bootstrap remediation
+
+## Status
+
+Implemented with TDD on `fix/sprig-rolling-release-bootstrap` from merged
+`origin/main` commit `4deea1a0d7fc`. Beads item `ios-buzz-59e.9` tracks
+delivery. The pull request and merged commit are recorded at promotion time.
+
+## Root cause
+
+The `Sprig` workflow successfully built both static Linux artifacts on a push
+to `main`, then unconditionally ran `gh release edit sprig-latest`. This fork
+had no `sprig-latest` release, so its first rolling publication failed with
+`release not found` after all build work had completed.
+
+Creating the release manually would leave the workflow unable to bootstrap a
+new fork or recover after deliberate release removal. The defect therefore
+required a source-controlled fix rather than a one-time GitHub mutation.
+
+## Remediation
+
+The workflow now delegates rolling publication to
+`scripts/publish-sprig-rolling-release.sh`. The helper:
+
+- validates the repository, triggering SHA, GitHub CLI, artifact directory,
+  and non-empty artifact set before mutation;
+- queries the exact `sprig-latest` release through the GitHub API;
+- creates the prerelease with all assets when the API returns `404`;
+- updates metadata and replaces assets when the release already exists;
+- treats every non-404 query failure and every release command failure as
+  fatal; and
+- explicitly scopes all release operations to the triggering repository.
+
+No release, tag, or asset is created manually. The first successful
+post-merge workflow run is the acceptance path that bootstraps
+`sprig-latest`.
+
+## TDD evidence
+
+The new contract first failed because the checked-in publisher did not exist.
+After implementation it proves:
+
+- a missing release performs one create operation and no edit/upload path;
+- an existing release performs edit plus clobber upload and no create path;
+- both paths publish metadata for the triggering SHA;
+- a non-404 API failure stops before any release mutation;
+- a release command failure remains fatal; and
+- both the Sprig workflow and the Ubuntu CI detector execute the checked-in
+  helper and contract respectively.
+
+## Rollback
+
+Revert the delivery pull request. If the first successful promotion created
+`sprig-latest`, retain it unless release removal is separately authorized;
+deleting a published release or its tag is not part of this rollback.
diff --git a/scripts/publish-sprig-rolling-release.sh b/scripts/publish-sprig-rolling-release.sh
new file mode 100755
index 0000000000..2d6a2cddde
--- /dev/null
+++ b/scripts/publish-sprig-rolling-release.sh
@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+repo=${GITHUB_REPOSITORY:?GITHUB_REPOSITORY is required}
+sha=${GITHUB_SHA:?GITHUB_SHA is required}
+dist_dir=${SPRIG_DIST_DIR:-dist}
+tag='sprig-latest'
+title='Sprig (rolling)'
+notes="Rolling Linux build of Sprig (all-in-one buzz-acp + buzz-agent + buzz-dev-mcp), tracking \`main\` (\`${sha}\`)."
+
+if ! command -v gh >/dev/null 2>&1; then
+  echo "gh is required to publish the Sprig rolling release" >&2
+  exit 1
+fi
+
+if [[ ! "${repo}" =~ ^[A-Za-z0-9_.-]+/[A-Za-z0-9_.-]+$ ]]; then
+  echo "GITHUB_REPOSITORY must use the owner/repository form" >&2
+  exit 1
+fi
+
+if [[ ! -d "${dist_dir}" ]]; then
+  echo "Sprig artifact directory does not exist: ${dist_dir}" >&2
+  exit 1
+fi
+
+shopt -s nullglob
+assets=("${dist_dir}"/*)
+shopt -u nullglob
+if ((${#assets[@]} == 0)); then
+  echo "Sprig artifact directory is empty: ${dist_dir}" >&2
+  exit 1
+fi
+
+release_response=''
+if release_response=$(gh api --include "repos/${repo}/releases/tags/${tag}" 2>&1); then
+  release_exists=true
+elif grep -E -q '^HTTP/[0-9.]+ 404([[:space:]]|$)' <<<"${release_response}"; then
+  release_exists=false
+else
+  printf '%s\n' "${release_response}" >&2
+  exit 1
+fi
+
+if [[ "${release_exists}" == true ]]; then
+  gh release edit "${tag}" \
+    --prerelease \
+    --target "${sha}" \
+    --title "${title}" \
+    --notes "${notes}" \
+    --repo "${repo}"
+  gh release upload "${tag}" "${assets[@]}" \
+    --clobber \
+    --repo "${repo}"
+else
+  gh release create "${tag}" "${assets[@]}" \
+    --prerelease \
+    --target "${sha}" \
+    --title "${title}" \
+    --notes "${notes}" \
+    --repo "${repo}"
+fi
diff --git a/scripts/test-publish-sprig-rolling-release.sh b/scripts/test-publish-sprig-rolling-release.sh
new file mode 100755
index 0000000000..71284d8f2e
--- /dev/null
+++ b/scripts/test-publish-sprig-rolling-release.sh
@@ -0,0 +1,132 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+repo_root=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
+publisher="${repo_root}/scripts/publish-sprig-rolling-release.sh"
+sprig_workflow="${repo_root}/.github/workflows/sprig.yml"
+ci_workflow="${repo_root}/.github/workflows/ci.yml"
+
+fail() {
+  echo "sprig rolling release contract failed: $*" >&2
+  exit 1
+}
+
+[[ -x "${publisher}" ]] || fail "missing executable ${publisher}"
+grep -F -q 'scripts/publish-sprig-rolling-release.sh' "${sprig_workflow}" \
+  || fail "Sprig workflow must invoke the checked-in publisher"
+grep -F -q 'scripts/test-publish-sprig-rolling-release.sh' "${ci_workflow}" \
+  || fail "CI must execute the Sprig rolling release contract"
+
+tmp=$(mktemp -d)
+trap 'rm -rf "${tmp}"' EXIT
+mkdir -p "${tmp}/bin" "${tmp}/dist"
+touch \
+  "${tmp}/dist/sprig-aarch64-unknown-linux-musl.tar.gz" \
+  "${tmp}/dist/sprig-aarch64-unknown-linux-musl.tar.gz.sha256" \
+  "${tmp}/dist/sprig-x86_64-unknown-linux-musl.tar.gz" \
+  "${tmp}/dist/sprig-x86_64-unknown-linux-musl.tar.gz.sha256"
+
+cat >"${tmp}/bin/gh" <<'EOF'
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+command_name=${1-}
+shift || true
+{
+  printf '%s' "${command_name}"
+  for argument in "$@"; do
+    printf '\t%s' "${argument}"
+  done
+  printf '\n'
+} >>"${GH_LOG:?}"
+
+case "${command_name}" in
+  api)
+    case "${GH_API_MODE:?}" in
+      existing)
+        printf 'HTTP/2.0 200 OK\n\n{"tag_name":"sprig-latest"}\n'
+        ;;
+      missing)
+        printf 'HTTP/2.0 404 Not Found\n\n{"message":"Not Found"}\n'
+        exit 1
+        ;;
+      error)
+        printf 'HTTP/2.0 500 Internal Server Error\n\n{"message":"failure"}\n'
+        exit 1
+        ;;
+      *)
+        echo "unexpected GH_API_MODE=${GH_API_MODE}" >&2
+        exit 2
+        ;;
+    esac
+    ;;
+  release)
+    exit "${GH_RELEASE_STATUS:-0}"
+    ;;
+  *)
+    echo "unexpected gh command: ${command_name}" >&2
+    exit 2
+    ;;
+esac
+EOF
+chmod +x "${tmp}/bin/gh"
+
+run_publisher() {
+  local mode=$1
+  local log=$2
+  GH_API_MODE="${mode}" \
+    GH_LOG="${log}" \
+    GITHUB_REPOSITORY='BrianInAz/buzz' \
+    GITHUB_SHA='0123456789abcdef' \
+    PATH="${tmp}/bin:${PATH}" \
+    SPRIG_DIST_DIR="${tmp}/dist" \
+    "${publisher}"
+}
+
+missing_log="${tmp}/missing.log"
+run_publisher missing "${missing_log}"
+grep -F -q $'api\t--include\trepos/BrianInAz/buzz/releases/tags/sprig-latest' "${missing_log}" \
+  || fail "missing-release path must query the exact tag"
+grep -F -q $'release\tcreate\tsprig-latest' "${missing_log}" \
+  || fail "missing-release path must create sprig-latest"
+grep -F -q $'\t--prerelease\t--target\t0123456789abcdef' "${missing_log}" \
+  || fail "create must publish a prerelease at the triggering SHA"
+grep -F -q $'\t--repo\tBrianInAz/buzz' "${missing_log}" \
+  || fail "create must target the triggering repository explicitly"
+if grep -F -q $'release\tedit\t' "${missing_log}" \
+  || grep -F -q $'release\tupload\t' "${missing_log}"; then
+  fail "missing-release path must not edit or separately upload"
+fi
+
+existing_log="${tmp}/existing.log"
+run_publisher existing "${existing_log}"
+grep -F -q $'release\tedit\tsprig-latest' "${existing_log}" \
+  || fail "existing-release path must edit sprig-latest"
+grep -F -q $'\t--prerelease\t--target\t0123456789abcdef' "${existing_log}" \
+  || fail "edit must retarget the prerelease to the triggering SHA"
+grep -F -q $'release\tupload\tsprig-latest' "${existing_log}" \
+  || fail "existing-release path must replace rolling assets"
+grep -F -q $'\t--clobber\t--repo\tBrianInAz/buzz' "${existing_log}" \
+  || fail "asset replacement must be explicit and repository-scoped"
+if grep -F -q $'release\tcreate\t' "${existing_log}"; then
+  fail "existing-release path must not create a duplicate release"
+fi
+
+error_log="${tmp}/error.log"
+if run_publisher error "${error_log}" >"${tmp}/error.out" 2>&1; then
+  fail "non-404 API failure must stop publication"
+fi
+grep -F -q '500 Internal Server Error' "${tmp}/error.out" \
+  || fail "non-404 API failure must remain visible"
+if grep -F -q $'release\t' "${error_log}"; then
+  fail "non-404 API failure must not attempt release mutation"
+fi
+
+release_error_log="${tmp}/release-error.log"
+if GH_RELEASE_STATUS=23 run_publisher missing "${release_error_log}" >/dev/null 2>&1; then
+  fail "release command failure must remain fatal"
+fi
+
+echo "sprig rolling release contract passed"