fix(ci)+test(packaging): 接线自检不再给假安全证书：19 条变异重放全红，dev 线接上

r1 复审 P1-1：上一版自检对外宣称「不可能被改成总是绿」，实测 19 条变异漏 11 条
（最要命的是把 `available` 写成恒 false —— 门禁永久关闭而每次运行都绿）。根因是三条
判据只是字符串存在性检查、自测步与自检步被整条豁免、`is True` 挡不住 `'true'`。

`packaging/tests/gpu_shot_ci_selftest.py` 重写为 6 条判据：
① 五步按 `id:` 必须在场且无条件（`vectors`/`exitcodes`/`wiring`/`detect`/`judge`，
   `exitcodes` 还得真断言 `expect 0/1/2`）；
② 解析 `if:` 表达式后**求值**判「判定挂门」（`available` 取 `'true'`/`'false'`/`''`
   必须真/假/假，认不出一律红）—— `|| always()` 这类文本层面的门现在真红了；
③ 两种调用形态都必须在场且产物来自 `needs.probe.outputs.*`；
④ 跳过路径**实跑 7 种输入**（新增 `packaging/tests/gpu_shot_ci_probe.py`），
   断言 `$GITHUB_OUTPUT` 的 `available`、summary 文案、`::warning::` 与三条红线的 exit≠0；
⑤ `continue-on-error` 按 YAML 布尔语义判（`'true'` / `${{ true }}` 也算开启）；
⑥ 扫所有 `python`+`packaging/` 的 `run`（自测步、自检步都在内），`|| true` / `; true` /
   `|| exit 0` / 裸 `exit 0` 全算吞。
变异向量搬到 `packaging/tests/gpu_shot_ci_vectors.json`：21 条，按解析后的结构注入。

P2-1：`gpu-evidence.yml` 加 `workflow_call:`，`dev-guards.yml` 里 `uses:` 同一份 ——
直推 dev 时 selftest 那一半现在会跑（evidence 在 dev 上照样显式跳过）。
P2-2：跳过摘要与 `gpu-evidence.md §8` 改成唯一可行的补救路径（把产物提交进被 dispatch
的 ref，`git add -f`），并写明「就地拷文件在 CI 上做不到」。
措辞：三处「不可能被改成总是绿」改成能复跑的覆盖面 + 边界。

packaging/tests/gpu_shot_ci_vectors.json

@@ -0,0 +1,26 @@
+{
+  "_note": "M253 接线自检的变异向量（r1 复审那 19 条 + 1 条本轮的）。每条按解析后的结构注入，不靠文本排版：op ∈ step_delete / job_delete / step_set / job_set / run_append / run_replace；target 是步骤或 job 的 id。expect = 必须报错的判据名（与 gpu_shot_ci_selftest.py 的 CHECKS 键逐字一致）。",
+  "vectors": [
+    {"id": "M1", "label": "自测步命令后加 || true（自测被吞）", "op": "run_append", "target": "vectors", "value": " || true", "expect": "6 不吞退出码"},
+    {"id": "M2", "label": "接线自检步命令后加 || true（守卫守不到自己）", "op": "run_append", "target": "wiring", "value": " || true", "expect": "6 不吞退出码"},
+    {"id": "M2b", "label": "接线自检步命令后加 ; true", "op": "run_append", "target": "wiring", "value": "; true", "expect": "6 不吞退出码"},
+    {"id": "M3", "label": "判定的门加 || always()（门形同虚设）", "op": "job_set", "target": "evidence", "key": "if", "value": "needs.probe.outputs.available == 'true' || always()", "expect": "2 判定必须挂门"},
+    {"id": "M4", "label": "判据命令后加裸 exit 0", "op": "run_append", "target": "judge", "value": "\nexit 0\n", "expect": "6 不吞退出码"},
+    {"id": "M5", "label": "整行删掉 ::warning:: 告警", "op": "run_replace", "target": "detect", "find": "echo \"::warning::GPU 证据：跳过（${reason}）—— 本次运行没有判过任何真实产物，不构成「GPU 证据已验证」\"", "replace": "", "expect": "4 跳过路径真跑"},
+    {"id": "M6", "label": "不再写 $GITHUB_OUTPUT（判定永远拿不到产物）", "op": "run_replace", "target": "detect", "find": ">> \"$GITHUB_OUTPUT\"", "replace": ">> /dev/null", "expect": "4 跳过路径真跑"},
+    {"id": "M7", "label": "selftest job 加 job 级 if: false", "op": "job_set", "target": "selftest", "key": "if", "value": false, "expect": "1 五步必须在场"},
+    {"id": "M8", "label": "探测步加 continue-on-error: true", "op": "step_set", "target": "detect", "key": "continue-on-error", "value": true, "expect": "5 禁 continue-on-error"},
+    {"id": "M9", "label": "接线自检步加 if: false", "op": "step_set", "target": "wiring", "key": "if", "value": false, "expect": "1 五步必须在场"},
+    {"id": "M10", "label": "整步删掉接线自检", "op": "step_delete", "target": "wiring", "expect": "1 五步必须在场"},
+    {"id": "M11", "label": "dispatch 分支 available 恒 false（门禁永久关闭）", "op": "run_replace", "target": "detect", "find": "available=true", "replace": "available=false", "occurrence": 1, "expect": "4 跳过路径真跑"},
+    {"id": "M12", "label": "约定产物分支 available 恒 false（门禁永久关闭）", "op": "run_replace", "target": "detect", "find": "available=true", "replace": "available=false", "occurrence": 2, "expect": "4 跳过路径真跑"},
+    {"id": "M13", "label": "整块删掉 evidence job", "op": "job_delete", "target": "evidence", "expect": "1 五步必须在场"},
+    {"id": "M14", "label": "::warning:: 改成裸 echo（跳过变静默 pass）", "op": "run_replace", "target": "detect", "find": "::warning::", "replace": "", "expect": "4 跳过路径真跑"},
+    {"id": "M15", "label": "整步删掉 --self-test", "op": "step_delete", "target": "vectors", "expect": "1 五步必须在场"},
+    {"id": "M16", "label": "整步删掉退出码语义 0/1/2", "op": "step_delete", "target": "exitcodes", "expect": "1 五步必须在场"},
+    {"id": "M17", "label": "continue-on-error: 'true'（带引号）", "op": "step_set", "target": "detect", "key": "continue-on-error", "value": "true", "expect": "5 禁 continue-on-error"},
+    {"id": "M18", "label": "continue-on-error: ${{ true }}（表达式）", "op": "step_set", "target": "detect", "key": "continue-on-error", "value": "${{ true }}", "expect": "5 禁 continue-on-error"},
+    {"id": "M19", "label": "判定步加 if: ${{ always() }}", "op": "step_set", "target": "judge", "key": "if", "value": "${{ always() }}", "expect": "2 判定必须挂门"},
+    {"id": "M20", "label": "判定步的命令换成 true（不再调判据脚本）", "op": "run_replace", "target": "judge", "find": "python3 packaging/check_gpu_shot.py \"$LOG\" \"$PNG\"", "replace": "true", "expect": "3 判定用探测给的产物"}
+  ]
+}