Merge pull request '[bug-yhg8dqypwmar] fix(check-naming): reject hidden provenance' (#4) from architect/bug-yhg8dqypwmar/reject-hidden-provenance into main
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This commit was merged in pull request #4.
This commit is contained in:
2026-08-27 17:53:56 +00:00
5 changed files with 280 additions and 18 deletions
+14 -5
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@@ -37,6 +37,8 @@ jobs:
pr-title: ${{ github.event.pull_request.title }}
pr-author: ${{ github.event.pull_request.user.login }}
pr-body: ${{ github.event.pull_request.body }}
server-url: ${{ github.server_url }}
token: ${{ github.token }}
base-sha: ${{ github.event.pull_request.base.sha }}
head-sha: ${{ github.event.pull_request.head.sha }}
```
@@ -52,12 +54,14 @@ job — the step still fails, but the job cannot block the PR.
| `pr-title` | yes | PR title — `github.event.pull_request.title` |
| `pr-author` | no | PR author login — `github.event.pull_request.user.login`; `dfritz` is exempt |
| `pr-body` | yes | PR description — `github.event.pull_request.body` |
| `server-url` | yes | Gitea server URL — `github.server_url` |
| `token` | yes | Gitea Actions token — `github.token` |
| `base-sha` | yes | Base commit — `github.event.pull_request.base.sha` |
| `head-sha` | yes | Head commit — `github.event.pull_request.head.sha` |
## Behavior
The check validates four things for a Bug-backed Agent PR:
The check validates four things for every non-break-glass Agent PR:
1. **Branch form** — must be `<role>/bug-<id>/<kebab>` or `chore/<kebab>`.
Unknown roles, missing `bug-` segment, uppercase bug-ids, and empty
@@ -67,12 +71,17 @@ The check validates four things for a Bug-backed Agent PR:
`[bug-<id>] `. For a `chore` branch the title must have no `[bug-id]`
prefix. If both carry a bug-id they must match.
3. **Tracking and attribution**`## Tracking` contains both the literal
3. **Tracking and attribution** on Bug-backed work, `## Tracking` contains both the literal
`Fixes bug-<id>` automation token and the matching navigable
`https://agenthub.fritzlab.net/bug-<id>` URL. A separate `## Attribution`
section contains the canonical `Authored-By` product/model watermark.
`https://agenthub.fritzlab.net/bug-<id>` URL. Every PR has a separate
`## Attribution` section containing the canonical `Authored-By`
product/model watermark. The action asks Gitea to render the body with a
bounded 5-second connection and 15-second total wait, then checks visible
`<h2>` sections outside collapsed `<details>` content. Fenced, commented,
scripted, or collapsed copies do not satisfy the visible provenance contract.
4. **Commit attribution** — every commit in `base-sha..head-sha` ends with
4. **Commit attribution** — every commit in `base-sha..head-sha`, including
commits on `chore/` branches, ends with
the canonical `Authored-By` trailer, separated from the message body by a
blank line. The naming job must check out full history before this action.
+8
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@@ -29,6 +29,12 @@ inputs:
pr-body:
description: PR description — github.event.pull_request.body.
required: true
server-url:
description: Gitea server URL — github.server_url.
required: true
token:
description: Gitea Actions token — github.token.
required: true
base-sha:
description: Base commit SHA — github.event.pull_request.base.sha.
required: true
@@ -46,6 +52,8 @@ runs:
PR_TITLE: ${{ inputs.pr-title }}
PR_AUTHOR: ${{ inputs.pr-author }}
PR_BODY: ${{ inputs.pr-body }}
GITEA_SERVER_URL: ${{ inputs.server-url }}
GITEA_TOKEN: ${{ inputs.token }}
BASE_SHA: ${{ inputs.base-sha }}
HEAD_SHA: ${{ inputs.head-sha }}
run: bash "${{ github.action_path }}/check.sh"
+74 -11
View File
@@ -10,6 +10,8 @@ AUTHOR="${PR_AUTHOR:-}"
BODY="${PR_BODY:-}"
BASE="${BASE_SHA:-}"
HEAD="${HEAD_SHA:-}"
SERVER_URL="${GITEA_SERVER_URL:-}"
TOKEN="${GITEA_TOKEN:-}"
# Break-glass: dfritz is exempt from all naming checks.
if [ "${AUTHOR}" = "dfritz" ]; then
@@ -21,6 +23,64 @@ FAILED=0
BRANCH_KIND="invalid"
BRANCH_BUG=""
# Gitea's renderer is the visibility contract. Validate its output instead of
# maintaining a second Markdown parser in this action.
RENDERED_BODY=""
if [ -z "${SERVER_URL}" ] || [ -z "${TOKEN}" ]; then
echo "FAIL[check-naming]: server-url and token are required to render the PR body"
FAILED=1
elif ! RENDERED_BODY=$(printf '%s' "${BODY}" |
jq -Rs '{Text: ., Mode: "gfm"}' |
curl --fail --silent --show-error \
--connect-timeout 5 \
--max-time 15 \
--header "Authorization: token ${TOKEN}" \
--header "Content-Type: application/json" \
--data-binary @- "${SERVER_URL%/}/api/v1/markdown"); then
echo "FAIL[check-naming]: Gitea could not render the PR body"
FAILED=1
fi
# A collapsed disclosure is valid supporting content, but provenance inside one
# is not visible by default. Remove only collapsed details subtrees; an open
# disclosure remains visible unless one of its ancestors is collapsed.
VISIBLE_BODY=$(printf '%s\n' "${RENDERED_BODY}" |
awk '
{
line=$0 "\n"
for (i=1; i<=length(line); i++) {
char=substr(line, i, 1)
if (in_tag) {
tag=tag char
if (char == ">") {
lower=tolower(tag)
if (lower ~ /^<details([[:space:]>])/) {
attributes=lower
gsub(/"[^"]*"/, "", attributes)
parent_hidden=(details_depth > 0 && hidden[details_depth])
details_depth++
hidden[details_depth]=(parent_hidden || attributes !~ /[[:space:]]open([[:space:]=>]|$)/)
}
else if (lower ~ /^<\/details([[:space:]>])/) {
if (details_depth > 0) {
delete hidden[details_depth]
details_depth--
}
}
else if (!hidden[details_depth]) printf "%s", tag
in_tag=0
tag=""
}
}
else if (char == "<") {
in_tag=1
tag=char
}
else if (!hidden[details_depth]) printf "%s", char
}
}
')
# ---- branch form ----
# <role>/bug-<id>/<kebab>
if echo "${BRANCH}" | grep -qE "^(dev|ux|ops|security|perf|architect|support)/bug-[a-z0-9]+/[a-z0-9][a-z0-9-]*$"; then
@@ -53,16 +113,16 @@ if [ "${BRANCH_KIND}" = "role-bug" ]; then
FAILED=1
fi
tracking=$(printf '%s\n' "${BODY}" | awk '
/^## Tracking[[:space:]]*$/ { in_section=1; next }
/^## / && in_section { exit }
tracking=$(printf '%s\n' "${VISIBLE_BODY}" | awk '
/<h2[^>]*>Tracking<\/h2>/ { in_section=1; next }
/<h2[^>]*>/ && in_section { exit }
in_section { print }
')
if [ -z "${tracking}" ]; then
echo "FAIL[check-naming]: PR body must contain a non-empty ## Tracking section"
FAILED=1
else
if ! printf '%s\n' "${tracking}" | grep -qE "(^|[[:space:]])Fixes[[:space:]]+${BRANCH_BUG}([^a-z0-9]|$)"; then
if ! printf '%s\n' "${tracking}" | grep -qE "(^|[[:space:]>])Fixes[[:space:]]+${BRANCH_BUG}([^a-z0-9]|$)"; then
echo "FAIL[check-naming]: ## Tracking must contain the literal token 'Fixes ${BRANCH_BUG}'"
FAILED=1
fi
@@ -72,12 +132,18 @@ if [ "${BRANCH_KIND}" = "role-bug" ]; then
fi
fi
attribution=$(printf '%s\n' "${BODY}" | awk '
/^## Attribution[[:space:]]*$/ { in_section=1; next }
/^## / && in_section { exit }
elif [ "${BRANCH_KIND}" = "chore" ] && [ -n "${TITLE_BUG}" ]; then
echo "FAIL[check-naming]: chore branch should not carry a [bug-id] title prefix"
FAILED=1
fi
if [ "${BRANCH_KIND}" != "invalid" ]; then
attribution=$(printf '%s\n' "${VISIBLE_BODY}" | awk '
/<h2[^>]*>Attribution<\/h2>/ { in_section=1; next }
/<h2[^>]*>/ && in_section { exit }
in_section { print }
')
watermark_re='^[-*]?[[:space:]]*Authored-By: .+ \(.+\) <noreply@[[:alnum:].-]+>$'
watermark_re='Authored-By: .+ \(.+\) <a href="mailto:noreply@[[:alnum:].-]+"[^>]*>noreply@[[:alnum:].-]+</a>'
if ! printf '%s\n' "${attribution}" | grep -qE "${watermark_re}"; then
echo "FAIL[check-naming]: ## Attribution must contain an Authored-By product/model watermark"
FAILED=1
@@ -118,9 +184,6 @@ if [ "${BRANCH_KIND}" = "role-bug" ]; then
echo "FAIL[check-naming]: base-sha and head-sha must be lowercase hexadecimal commit SHAs"
FAILED=1
fi
elif [ "${BRANCH_KIND}" = "chore" ] && [ -n "${TITLE_BUG}" ]; then
echo "FAIL[check-naming]: chore branch should not carry a [bug-id] title prefix"
FAILED=1
fi
if [ "${FAILED}" -eq 0 ]; then
Executable
+87
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@@ -0,0 +1,87 @@
#!/usr/bin/env bash
# Deterministic Gitea Markdown renderer stub for check.sh contract tests.
set -euo pipefail
connect_timeout=0
total_timeout=0
while [ "$#" -gt 0 ]; do
case "$1" in
--connect-timeout)
[ "${2:-}" = "5" ] || exit 2
connect_timeout=1
shift 2
;;
--max-time)
[ "${2:-}" = "15" ] || exit 2
total_timeout=1
shift 2
;;
*) shift ;;
esac
done
[ "${connect_timeout}" -eq 1 ] && [ "${total_timeout}" -eq 1 ] || exit 2
if printf '%s\n' "${PR_BODY}" | grep -Fq '[[stall-renderer]]'; then
exit 28
fi
if printf '%s\n' "${PR_BODY}" | grep -Fq '<!--'; then
exit 0
fi
printf '%s\n' "${PR_BODY}" | awk '
{
line=$0
lower=tolower(line)
pos=1
while (pos <= 4 && substr(line, pos, 1) == " ") pos++
char=substr(line, pos, 1)
run=0
if (char == "`" || char == "~") while (substr(line, pos + run, 1) == char) run++
rest=substr(line, pos + run)
if (in_fence) {
if (pos <= 4 && char == fence_char && run >= fence_run && rest ~ /^[[:blank:]]*$/) in_fence=0
next
}
if (in_script) {
if (lower ~ /<\/script[[:blank:]]*>/) in_script=0
next
}
if (pos <= 4 && run >= 3 && (char == "~" || index(rest, "`") == 0)) {
in_fence=1
fence_char=char
fence_run=run
next
}
if (lower ~ /^[ ]{0,3}<script([[:blank:]>])/) {
in_script=1
next
}
if (lower ~ /^[ ]{0,3}<\/details([[:blank:]>])/) {
print "</details>"
next
}
if (lower ~ /^[ ]{0,3}<details([[:blank:]>])/) {
attributes=lower
gsub(/"[^"]*"/, "", attributes)
if (attributes ~ /[[:blank:]]open([[:blank:]=>]|$)/) sub(/<details open>/, "<details open=\"\">", line)
print line
next
}
if (line ~ /^## Tracking[[:space:]]*$/) print "<h2>Tracking</h2>"
else if (line ~ /^## Attribution[[:space:]]*$/) print "<h2>Attribution</h2>"
else if (line ~ /^- Fixes[[:space:]]/) print "<li>" substr(line, 3) "</li>"
else if (line ~ /Authored-By:.*<noreply@[[:alnum:].-]+>/) {
email=line
sub(/^.*</, "", email)
sub(/>.*/, "", email)
sub(/ <noreply@[[:alnum:].-]+>.*/, "", line)
print line " <a href=\"mailto:" email "\">" email "</a>"
}
else {
gsub(/</, "\\&lt;", line)
gsub(/>/, "\\&gt;", line)
print line
}
}
'
+97 -2
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@@ -3,6 +3,7 @@
set -euo pipefail
SCRIPT="$(cd "$(dirname "$0")/.." && pwd)/check.sh"
TEST_BIN="$(cd "$(dirname "$0")" && pwd)/bin"
PASS=0
FAIL=0
FIXTURES=$(mktemp -d)
@@ -28,7 +29,8 @@ check() {
body=$(canonical_body "${bug:-bug-test}")
local out rc=0
out=$(cd "${FIXTURES}" && HEAD_BRANCH="$branch" PR_TITLE="$title" PR_AUTHOR="$author" \
PR_BODY="$body" BASE_SHA="$BASE" HEAD_SHA="$GOOD_HEAD" bash "$SCRIPT" 2>&1) || rc=$?
PR_BODY="$body" GITEA_SERVER_URL="https://code.test" GITEA_TOKEN="test-token" PATH="${TEST_BIN}:$PATH" \
BASE_SHA="$BASE" HEAD_SHA="$GOOD_HEAD" bash "$SCRIPT" 2>&1) || rc=$?
local got_lines=0
echo "$out" | grep -qE "^FAIL" && got_lines=1 || true
if [ "$rc" -eq "$want_fail" ] && [ "$got_lines" -eq "$want_fail" ]; then
@@ -46,7 +48,42 @@ check_contract() {
local out rc=0
out=$(cd "${FIXTURES}" && HEAD_BRANCH="architect/bug-x7k2m9/contract" \
PR_TITLE="[bug-x7k2m9] Enforce contract" PR_AUTHOR="architect" \
PR_BODY="$body" BASE_SHA="$base" HEAD_SHA="$head" bash "$SCRIPT" 2>&1) || rc=$?
PR_BODY="$body" GITEA_SERVER_URL="https://code.test" GITEA_TOKEN="test-token" PATH="${TEST_BIN}:$PATH" \
BASE_SHA="$base" HEAD_SHA="$head" bash "$SCRIPT" 2>&1) || rc=$?
if [ "$rc" -eq 1 ] && printf '%s\n' "$out" | grep -Fq "$diagnostic"; then
echo "PASS [$desc]"
PASS=$((PASS + 1))
else
echo "FAIL [$desc]: expected exit=1 and diagnostic '$diagnostic', got exit=$rc"
echo " output: $out"
FAIL=$((FAIL + 1))
fi
}
check_contract_pass() {
local desc="$1" body="$2" base="$3" head="$4"
local out rc=0
out=$(cd "${FIXTURES}" && HEAD_BRANCH="architect/bug-x7k2m9/contract" \
PR_TITLE="[bug-x7k2m9] Enforce contract" PR_AUTHOR="architect" \
PR_BODY="$body" GITEA_SERVER_URL="https://code.test" GITEA_TOKEN="test-token" PATH="${TEST_BIN}:$PATH" \
BASE_SHA="$base" HEAD_SHA="$head" bash "$SCRIPT" 2>&1) || rc=$?
if [ "$rc" -eq 0 ] && printf '%s\n' "$out" | grep -Fq "check-naming: ok"; then
echo "PASS [$desc]"
PASS=$((PASS + 1))
else
echo "FAIL [$desc]: expected exit=0 and check-naming: ok, got exit=$rc"
echo " output: $out"
FAIL=$((FAIL + 1))
fi
}
check_chore_contract() {
local desc="$1" body="$2" base="$3" head="$4" diagnostic="$5"
local out rc=0
out=$(cd "${FIXTURES}" && HEAD_BRANCH="chore/contract" \
PR_TITLE="Improve delivery contract" PR_AUTHOR="dev" \
PR_BODY="$body" GITEA_SERVER_URL="https://code.test" GITEA_TOKEN="test-token" PATH="${TEST_BIN}:$PATH" \
BASE_SHA="$base" HEAD_SHA="$head" bash "$SCRIPT" 2>&1) || rc=$?
if [ "$rc" -eq 1 ] && printf '%s\n' "$out" | grep -Fq "$diagnostic"; then
echo "PASS [$desc]"
PASS=$((PASS + 1))
@@ -82,6 +119,8 @@ check "bug-id mismatch" 1 "dev/bug-x7k2m9/fix-resize" "[bug-
# fail: chore branch with [bug-id] title prefix
check "chore with bug-id title" 1 "chore/bump-deps" "[bug-abc123] Bump deps" "dev"
check "role/bug Conventional title" 0 "dev/bug-x7k2m9/fix-resize" "[bug-x7k2m9] fix(hub): fix resize" "dev"
check "chore Conventional title" 0 "chore/bump-deps" "chore(deps): bump deps" "dev"
# fail: invalid branch forms
check "invalid — no role prefix" 1 "feature/foo-bar" "Add feature" "dev"
@@ -104,10 +143,66 @@ check_contract "tracking rejects wrong Bug URL" \
check_contract "attribution must be in its own section" \
$'## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n- Authored-By: Codex (GPT-5) <noreply@openai.com>' \
"$BASE" "$GOOD_HEAD" "## Attribution must contain"
check_contract "hidden provenance does not satisfy the visible contract" \
$'<!--\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n-->' \
"$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
check_contract "comment removal cannot synthesize section headings" \
$'<!-- hidden -->## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n<!-- hidden -->## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>' \
"$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
check_contract "four-space indented backticks do not expose comments" \
$' ````\n<!--\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n-->' \
"$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
check_contract "unequal backtick runs do not expose comments" \
$'`<!--``\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n-->' \
"$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
check_contract "invalid backtick fence info does not expose comments" \
$'```html`oops\n<!--\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n-->' \
"$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
check_contract "invalid fence closer does not expose comments" \
$'```html\n```oops\n```\n<!--\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n-->' \
"$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
check_contract "fences inside comments do not expose provenance" \
$'<!--\n```html\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n-->' \
"$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
check_contract "escaped backticks do not hide a comment opener" \
$'\\`<!--\\`\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n-->' \
"$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
check_contract "fenced provenance does not satisfy the visible contract" \
$'```\n```oops\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>' \
"$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
check_contract "indented fence closer does not expose provenance" \
$'```\n ```\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n```' \
"$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
check_contract_pass "fenced code examples remain available" \
$'```html\n<script>example only</script>\n```\n\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>' \
"$BASE" "$GOOD_HEAD"
check_contract "details cannot collapse provenance" \
$'<details><summary>Release notes</summary>\n\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n</details>' \
"$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
check_contract_pass "open details preserve visible provenance" \
$'<details open><summary>Release notes</summary>\n\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n</details>' \
"$BASE" "$GOOD_HEAD"
check_contract "open details inside collapsed details remain hidden" \
$'<details><summary>Release notes</summary>\n<details open><summary>Visible only after expansion</summary>\n\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n</details>\n</details>' \
"$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
check_contract "open text in another details attribute remains collapsed" \
$'<details title="x open y"><summary>Release notes</summary>\n\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n</details>' \
"$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
check_contract_pass "unrelated collapsed details remain available" \
$'<details><summary>Logs</summary>\n\nSupporting output\n</details>\n\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>' \
"$BASE" "$GOOD_HEAD"
check_contract "script cannot suppress provenance" \
$'<script>\n## Tracking\n- Fixes bug-x7k2m9 — https://agenthub.fritzlab.net/bug-x7k2m9\n\n## Attribution\n- Authored-By: Codex (GPT-5) <noreply@openai.com>\n</script>' \
"$BASE" "$GOOD_HEAD" "PR body must contain a non-empty ## Tracking section"
check_contract "stalled renderer fails closed at the curl timeout" \
"$(canonical_body bug-x7k2m9)"$'\n[[stall-renderer]]' \
"$BASE" "$GOOD_HEAD" "Gitea could not render the PR body"
git -C "${FIXTURES}" commit --allow-empty -q -m "unwatermarked change"
BAD_HEAD=$(git -C "${FIXTURES}" rev-parse HEAD)
check_contract "agenthub 779 commits reject missing watermark" "$BODY" "$GOOD_HEAD" "$BAD_HEAD" "must end with an Authored-By"
check_chore_contract "chore requires PR attribution" "" "$BASE" "$GOOD_HEAD" "## Attribution must contain"
check_chore_contract "chore commits require watermark" "$(canonical_body bug-unused)" "$GOOD_HEAD" "$BAD_HEAD" "must end with an Authored-By"
git -C "${FIXTURES}" commit --allow-empty -q -m $'misplaced trailer\nAuthored-By: Codex (GPT-5) <noreply@openai.com>'
MISPLACED_HEAD=$(git -C "${FIXTURES}" rev-parse HEAD)