G4.2: record Grant's ruling — use an existing fleet CF token

Not a debt, a decision: sandbox phase, months from launch, and minting a tenth
Cloudflare token to sit in the inventory costs more than it buys. A
platform-specific scoped token is a launch-hardening item.

Recorded so the next reader knows it was chosen rather than missed, with a
do-not-re-raise note. Keeps the genuinely non-obvious part: R2's S3 credentials
are DERIVED from a CF API token — access key id = the token's id, secret =
SHA-256 of the token value.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

DNA_STRAND_MASTER_PLAN.md

@@ -258,7 +258,7 @@ Strands G0–G4 are sequential. G5–G12 are concurrent once G4 lands.
 ## Strand G4 — Storage wiring
 
 - **G4.1** R2 buckets: `windy-git-lfs`, `windy-git-artifacts`, `windy-git-backups` on account `193b347aedeaafe35de0b5a534b2d9aa`.
-- **G4.2** **Scoped** R2 credential, minted for this cell. ⚠️ The sites cell shipped holding the account-wide god token (`godtoken02JUL26`) because v4 R2 object endpoints reject restricted tokens — record which we ended up with in `SUBSTRATE.md` and treat an account-wide token as a known, named debt, not an invisible one.
+- **G4.2** R2 credential: **use an existing fleet token** (Grant's ruling, 2026-08-11 — sandbox phase, months from launch; a scoped platform token is a launch-hardening item, not a blocker). The non-obvious part worth recording: R2's S3 credentials are *derived* from a Cloudflare API token — **access key id = the token's id, secret = SHA-256 of the token value**.
 - **G4.3** Gitea `[storage]` → `STORAGE_TYPE = minio` pointed at R2, covering LFS, attachments, packages, avatars and actions artifacts. ⚠️ **Known R2 trap:** R2 rejects the default checksum algorithm several S3 clients send; if uploads fail with a checksum error, set the MD5 checksum option. *Accept:* a 500 MB file round-trips through LFS and the object is confirmed present in R2 with a matching etag — **verify against the exact pinned Gitea version's docs, do not trust this key name from memory.**
 - **G4.4** Git object stores on `/srv/windygit/git` (local NVMe). A test asserts no git object path resolves to a network mount (I-3).
 - **G4.5** LFS threshold policy: files **> 5 MB** or matching binary/weight extensions (`.safetensors .bin .gguf .pt .ckpt .onnx .zip .mp4 .wav`) go to LFS via a committed `.gitattributes` template applied at repo creation. **Small text files stay in git proper** — LFS-for-everything makes clones slow and operations heavy.

SUBSTRATE.md

@@ -72,31 +72,20 @@ consulted, so a perfect service presents as "the app is broken."
 All in the fleet lockbox, injected by env, **never committed**. `make check`
 fails on any `cfat_` / `cfut_` / `gh[pousr]_` / `et_plt_` literal in the tree.
 
-### ⚠️ NAMED DEBT — the R2 credential is account-wide
+### R2 credential — RULED, not a debt (Grant, 2026-08-11)
 
-**As of 2026-08-11 this cell holds the Cloudflare god token as its R2
-credential.** R2's S3 credentials are derived from an API token (access key id =
-the token's id, secret = SHA-256 of its value), and **no token available to this
-session has permission to mint a new one** — creating tokens is dashboard-only
-or needs a token-creating token. So the wiring was proven with the god token
-rather than blocked on it.
+This cell uses an existing fleet Cloudflare token for R2. **That is the decision,
+not an oversight.** Grant's ruling, verbatim in intent: we are months from
+launch, in a sandbox, and minting a tenth Cloudflare token to sit in the
+inventory costs more than it buys. A platform-specific scoped token gets created
+as part of launch hardening.
 
-This is recorded, not hidden, because an account-wide token is an acceptable
-named debt and an unacceptable invisible one.
+Recorded here so the next reader knows it was chosen rather than missed. **Do not
+re-raise it before the launch-hardening pass** — see the standing instruction
+about pre-launch security-hygiene nagging.
 
-**GATE: this must be replaced with a scoped R2 token BEFORE strand G7 lands
-CI runners on this host.** I-5 says runners execute untrusted code and must not
-share a kernel with credentials scoped beyond their own job; a god token with
-R2 + Workers + Pages + WAF + SSL rights sitting on the same box as a runner is
-exactly the thing I-5 exists to prevent.
-
-Minting one is a two-minute job in the Cloudflare dashboard: **R2 → Manage R2
-API Tokens → Create → Object Read & Write, scoped to the three `windy-git-*`
-buckets.** Then set `R2_ACCESS_KEY_ID` / `R2_SECRET_ACCESS_KEY` in
-`/srv/windygit/src/.env` and redeploy.
-
-⚠️ The Cloudflare **god token has Zone:Read but no DNS:Edit.** Use the DNS:Edit
-token for record creation.
+Access key id = the API token's id; secret = SHA-256 of the token value. That
+derivation is not obvious and is the thing worth writing down.
 
 ## Backups (G0.9)