docs: ground rules + frozen live-POC facts (incl. metrics pipeline)

2026-06-18 10:07:02 -04:00
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+# Ground Rules (binding)
+
+These apply to every lane and every session. Read before doing anything.
+
+## Credentials
+- Credentials live **only** in the git-ignored `.env`. Never print, commit, or persist keys
+  elsewhere (not in docs, not in `config/targets.yaml`, not in commit messages).
+- Load with `set -a && . ./.env && set +a`.
+
+## The criteria Google Doc
+- **Never write the criteria Google Doc from a session.** Concurrent writes spliced tables
+  mid-word in the prior eval. Compose `criteria-section-N.md` locally; **the human pastes.**
+- Criterion / gate / benchmark-question wording is **verbatim** from the criteria doc —
+  never paraphrase. Re-read the doc if unsure.
+
+## Live-state check (REQUIRED before any conclusion)
+The deployment is actively changing; status docs age within a day. Before drawing any
+conclusion from the live instance:
+```
+git -C ~/repos/k8s-backstage-v2 log --oneline -8 origin/master -- apps/arcade
+```
+plus a dashboard/gateway health probe (e.g. `curl -sS -o /dev/null -w '%{http_code}\n' https://dashboard.arcade.st.dev`).
+Any not-yet-reverted in-flight "TEMPORARY"/teardown commit means the bench is NOT in a
+validated steady state — don't draw conclusions from it.
+
+## File ownership (parallel-session safety)
+| You may write | You may NOT write |
+|---|---|
+| your `categories/catN-*/` subtree (criteria-section-N.md, tests/, NOTES.md) | another lane's `categories/` subtree |
+| your own section of `STATUS.md` | another lane's STATUS section |
+| `config/targets.yaml`, `lib/`, top-level docs — **append-mostly**, coordinate | — |
+| `results/` (git-ignored) | the criteria Google Doc (see above) |
+
+`git pull --rebase` before starting and again before pushing; on rejection, `git pull --rebase`.
+
+## Deployment changes
+- `~/repos/k8s-backstage-v2/apps/arcade/**` is read freely but changed **only deliberately,
+  with the operator** (infra owns this cluster/POC). Expected case: the cat-5 collector+exporter
+  remediation — propose first, execute together, document before/after.
+
+## Scoring
+- Single candidate (Arcade only): 1–5 scale, anchors at 1/3/5. Scores drafted locally;
+  nothing lands in the Google Doc/spreadsheet without the human pasting.