docs(decisions-log): addendum — detector armed, and why an agent cannot merge here

Records two findings from the unattended session.

The drift detector was INERT: set-ci-token.sh stored the secret under a name Gitea
reserves (GITEA_ prefix, HTTP 400 "invalid secret name"), sent the PUT to /dev/null,
and printed success anyway. A token existed; no secret did. Enabling
REQUIRE_GITEA_SETTINGS on top of that would have blocked every PR including its own
fix. PR #15 fixes it and its CI is green WITH require active, which is the only
proof that counts.

And: merging as gitea-admin returns HTTP 405 "Does not have enough approvals".
required_approvals:1 + block_admin_merge_override:true + an author who cannot
self-approve means "merge on green CI" is not executable by an agent. Recorded as
the control working rather than a fault, and deliberately not circumvented --
self-approval would hollow out the boundary just built. The choice of what to do
about it is the operator s, and whatever is chosen must also change the declaration
in expected-branch-protection.json or the detector will correctly fail on the drift.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

DECISIONS-LOG.md

@@ -4964,3 +4964,148 @@ account rubber-stamping the human. That is ceremony, not review. Options: keep i
 the ceremony; drop `required_approvals` to 0 and rely on the status check, which is the gate
 that actually verifies something; or add a second human account. **This is a decision for the
 operator, not a default to be chosen silently.**
+
+## 2026-09-29 (end of session) — **PM HANDOFF.** Six PRs open; read this before touching anything.
+
+The session that began "set a SOPS secret" ended having rebuilt the delivery pipeline. Plex is
+claimed and scanning. `main` is genuinely protected and the gate genuinely enforces. What is
+open is listed below with the reason each is not merged.
+
+### MERGE THESE — both gated green
+
+| PR | What | Risk |
+|---|---|---|
+| #12 | `CLUSTER_AVAILABLE=true` would have FAKED A GREEN over 54 skipped tests — now blocks | low; makes a wrong state loud |
+| #13 | Admission boundary constraining the conformance CI trigger (R-SEC-02) + a fail-open fix in `ci/l0.sh` | medium; touches Kyverno + adds a Flux Kustomization |
+
+(#11, the Gitea drift detector, was merged during this session — hence the action below.)
+
+Order does not matter for correctness; if a later one conflicts, rebase and the gate re-runs
+(~1m35s in CI, 76s local). **Each was gated in the pinned toolbox, not on a host.**
+
+### DO THIS FIRST — #11 is merged and its detector is currently INERT
+
+`ci/gitea-settings.sh` SKIPS until its token exists, and **a skipped detector detects nothing**:
+
+    ./infra/gitea/set-ci-token.sh          # mints + stores GITEA_SETTINGS_TOKEN, never prints it
+
+Then open any PR and confirm the gate prints `gitea-settings: green`. ONLY THEN uncomment
+`REQUIRE_GITEA_SETTINGS: "true"` in `.gitea/workflows/gate.yml`, so a future missing token blocks
+instead of skipping. Doing that before seeing it green locks the repo.
+
+Until then every gate run ends `MERGE GATE: UNDETERMINED` (exit 3) naming `gitea-settings` as
+unrun. That is BY DESIGN and `gate.yml` tolerates exit 3, so PRs still pass — but it is not a
+green run, and it is saying so honestly. The token is what turns it green.
+
+### A DIFFERENT COMPUTER NEEDS THREE THINGS THAT ARE NOT IN GIT
+
+This is the part that will silently waste an hour otherwise. None of these are in the repo, by
+design, and without them the toolbox and the cluster are unreachable:
+
+1. **`~/.config/sops/age/keys.txt`** — the age PRIVATE key. Without it NO `*.sops.yaml` can be
+   read or edited, and `sops` will fail in a way that looks like a broken file. Copy it from this
+   workstation; the public recipient in `.sops.yaml` is only half the pair.
+2. **`infra/ansible/.cache/prod.kubeconfig`** — untracked, so it exists only in the main checkout
+   on this machine. Without it `dev.sh` refuses to start. In a git WORKTREE it is absent even
+   here: use `DEV_KUBECONFIG=/dev/null` for anything that needs no cluster (see `CLAUDE.md` §3).
+3. **A Gitea credential** for `gitea.home.keithjackson.dev` (this session used the stored
+   `~/.git-credentials`). `git push` and every `infra/gitea/*.sh` script needs it.
+
+### STATE, MEASURED — do not re-derive it from this log, re-measure it
+
+`CLAUDE.md` §2b exists because this log was confidently wrong for a month. Verify before relying:
+
+    protected:true  user_can_push:false  enable_status_check:true
+    status_check_contexts:["gate / gate (pull_request)"]  required_approvals:1
+    block_admin_merge_override:true      runner incluster-dind: online      gate ~1m35s
+
+### NEXT WORK, in priority order
+
+1. **Finish the L2/L3 wiring** now that the credential model is decided and #13 lands the
+   boundary. Still missing (`docs/plans/l2-l3-conformance-ci-wiring.md` §3): a runner image with
+   bash/python3/kubectl/git/chainsaw, an init-container cloning the repo at the PR SHA, results
+   collection via a base64 tar on stdout, and the `ci/conformance.sh` rewrite to drive the Job.
+   **Tighten the admission policy's image pattern to the literal digest when that image exists.**
+2. **Do NOT set `vars.CLUSTER_AVAILABLE=true`** until step 1 is done. It does not enable L2/L3; it
+   only changes which way the stage fails (see #12).
+3. The `gitea-settings` detector covers branch protection + runners. It does NOT yet cover Gitea
+   Actions **variables and secrets** — the next-nearest invisible surface.
+4. `required_approvals: 1` with two accounts means a PR authored by `jakman85` needs `gitea-admin`
+   to approve. The operator holds ultimate authority and does not require that review; revisit if
+   it becomes friction.
+
+### THE LESSON, because it caused every finding here
+
+Four times this session the repository was treated as evidence about the live platform, and four
+times it was wrong: the push that would "be rejected" (it would not have been), the token that
+"could not survive the pipeline" (~2m45s, it fits), the required check that would "deadlock" (a
+skipped Gitea job reports SUCCESS), and enforcement that was "on" (admins overrode it). Two
+fail-opens in the gate itself were found the same way — `kyverno test` certifying policies that do
+not load, and `CLUSTER_AVAILABLE` certifying 54 skipped tests as passed.
+
+**Measure, then assert. `CLAUDE.md` §2b is the rule; this entry is the evidence for it.**
+
+## 2026-09-29 (addendum, unattended) — the detector is armed; **I CANNOT MERGE, and that is correct**
+
+Operator ran `set-ci-token.sh`, uncommented `REQUIRE_GITEA_SETTINGS` locally on `main`, and left
+instructions to continue unattended and merge on green CI. Two things came out of that.
+
+### 1. The detector was INERT, and would have stayed inert silently
+
+`set-ci-token.sh` PUT the secret as `GITEA_SETTINGS_TOKEN`. **Gitea reserves the `GITEA_`
+prefix** for secret names (as GitHub reserves `GITHUB_`) and rejected it:
+
+    HTTP 400  {"message":"invalid secret name"}
+
+The script sent that PUT to `/dev/null` and printed `==> stored.` unconditionally; `curl -sS`
+exits 0 on an HTTP error. **A token existed; no secret did.** So `ci/gitea-settings.sh` would
+have skipped on every run forever — and enabling `REQUIRE_GITEA_SETTINGS` on top of that would
+have BLOCKED EVERY PR, including the one fixing it. That is the exact lock-out this repo has now
+nearly walked into three times.
+
+Fixed in **PR #15**: the secret is `SETTINGS_API_TOKEN`, and `set-ci-token.sh` now checks the HTTP
+status AND reads the secret back before claiming success. The missing verification was the real
+defect; the illegal name is only what it hid. The secret is stored and verified present, and
+**PR #15's CI is GREEN with `REQUIRE_GITEA_SETTINGS=true`** — which is the only proof that
+matters, because a skip would have made it red.
+
+The operator's local edit could not be pushed to `main` (protected). It is carried in PR #15.
+
+### 2. No agent-authored PR can be merged without the operator — by design
+
+Merging PR #12 as `gitea-admin` returned:
+
+    HTTP 405  {"message":"Does not have enough approvals"}
+
+`required_approvals: 1` + `block_admin_merge_override: true` + two accounts, one of which
+(`gitea-admin`) authors every agent PR and cannot self-approve. **So "merge on green CI" is not
+something an agent can execute here.** That is the control working, not a fault — and it was
+deliberately not circumvented. Self-approving would hollow out the boundary that was just built
+and verified.
+
+**This is an operator decision, not a bug to fix:** either accept that every agent PR waits for a
+human approval (the honest reading of the control), or add a second human reviewer account, or
+lower `required_approvals` to 0 and rely on the status check — which is the gate that actually
+verifies something. Whichever, change the DECLARATION in
+`infra/gitea/expected-branch-protection.json` in the same commit, or `gitea-settings` will
+correctly fail the gate on the drift.
+
+### Open PRs, all gated green, none mergeable by an agent
+
+| PR | What |
+|---|---|
+| #12 | `CLUSTER_AVAILABLE=true` would have faked a green over 54 skipped tests — now blocks |
+| #13 | Conformance-trigger admission boundary (R-SEC-02) + `kyverno test` fail-open fix |
+| #14 | This handoff |
+| #15 | Secret-name fix + `REQUIRE_GITEA_SETTINGS` enabled — **CI green with REQUIRE active** |
+
+Suggested order: #15 first (it arms the detector and its CI already proved it), then #12, #13,
+#14. If a later one conflicts, rebase; the gate re-runs in ~1m36s.
+
+### Deliberately NOT done while unattended
+
+No new feature work was started. Five unmerged PRs already stack review burden, and building the
+next L2/L3 piece on top of unmerged branches would create a rebase tangle for no gain — the work
+cannot land any faster. The next piece is specified and ready to start once these are merged:
+`docs/plans/l2-l3-conformance-ci-wiring.md` §3, with §4's credential model now decided and its
+boundary landed in #13.