feat: price med-arb by phase, attest the conflicts undertaking, and answer the first real spam

Pouya's rulings of 2026-09-03 (the last two D20 findings) and 2026-09-04 (the
spam observation and four mitigations), in one change set.

D20 finding 10 — med-arb is billed BY PHASE, each phase at the rates already
published, so /fees/'s "Every figure is on this page" is true as written rather
than narrowed. FEES.medArb is the single source; docs/07 §Med-arb carries the
rule INTERIM against R5, and R5 now carries it back, because a derived price
moves silently when a rate moves.

D20 finding 13 — conduct undertaking (g), attested 2026-09-03, published as his
wording verbatim on /legal/privacy/ and /contact/. The clause that raised the
finding promised to DISCLOSE a conflicts check's outcome, which the attestation
does not cover; it is struck. D20 now partitions 17 fixed / 2 refuted / 1 owed.

Spam, 2026-09-04 — recorded in docs/05 §Observed abuse with the date and
signature. A second honeypot (a decoy checkbox, own class, `hidden`, a label
that tells a human not to tick it) and scoring that LABELS and never rejects:
nothing is dropped, nothing new is stored, and only the operator notification
changes. Q65 opens the WAF cost call.

The timing floor could not be built: there is no timing check and never has
been. docs/05 carries it struck, and every mechanism that would give a real
per-visitor clock breaks zero-JS, handler-and-form-only, or D1. Q66.

configure.mjs gains section 5 — a custom origin request policy forwarding
CloudFront-Viewer-Address on /api/*. Written, dry-run against the live
distribution, NOT applied. It reads the handler's own header reads and refuses
to run if the whitelist omits one.

And reading the live account to do it found four AGENTS.md §7 rows saying the
intake backend was undeployed, two days after it went live — corrected against
get-function-configuration, get-routes, get-stage, get-policy and the deployed
zip, which was downloaded and read.

Review: adversarial-reviewer only (claims-auditor is D20's cutover pass and has
run). Round 1 five lenses, 56 findings, 7 blocking, 4 refuted by an independent
refuter; round 2 four lenses, 36 findings, 33 of them defects in round 1's own
repairs. Stopped at two per D19.

Gates, exit status read for each: check 0 · build 0 (23 pages) · check:claims 0
· check:intake 0 · og:proof 0 · lint 0 · spam-score.test 39/39 with 6/6 mutations
killed · router.test 30/30 · minifier grep 1 (clean) · lighthouse 0, no category
below 95 · configure.mjs dry run 0, nothing written.

Nothing deployed and nothing applied.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Md3GndFqWPzK78xAoebsg5

scripts/deploy-local.sh

@@ -181,10 +181,18 @@ else
   echo "  - the POST /api/intake route is missing or misspelled (Part 6.2);" >&2
   echo "  - the route exists and the distribution's 404 mapping is showing you" >&2
   echo "    /404.html instead of the API's own body." >&2
+  # THE ORIGIN REQUEST POLICY ON /api/* IS NO LONGER A CONSTANT. Since
+  # 2026-09-04 the behaviour may carry the custom `adr-sml-api-viewer-address`
+  # whitelist (docs/09 Part 3, change 8) instead of the managed policy, so this
+  # text no longer names one and tells the operator to read it. Naming the old
+  # one would send them to "restore" what was deliberately replaced.
   echo "403 means CloudFront rejected the method, or the handler refused the" >&2
-  echo "Origin — check the behaviour uses Managed-AllViewerExceptHostHeader," >&2
-  echo "because a policy that drops Origin turns every real submission into a" >&2
-  echo "403. 500 means the Lambda invoke permission for this route is missing" >&2
+  echo "Origin. Read which origin request policy /api/* carries — since" >&2
+  echo "2026-09-04 it may be the custom whitelist adr-sml-api-viewer-address" >&2
+  echo "rather than Managed-AllViewerExceptHostHeader — because a policy that" >&2
+  echo "drops or fails to forward Origin turns every real submission into a" >&2
+  echo "403. Rollback id: b689b0a8-53d0-40ab-baf2-68738e2966ac." >&2
+  echo "500 means the Lambda invoke permission for this route is missing" >&2
   echo "(Part 6.1) — the function is never entered, so CloudWatch is silent." >&2
   echo "Either way the form is not verified working. See docs/09-cutover-" >&2
   echo "runbook.md Part 7.1 and docs/06's cutover checklist." >&2