docs(adr): þing-01 P3 (#138) — ADR-013 references PLATFORM-001 by URL

[Polichinel]

Closes #138 (þing-01 P3 — the ledger row flagged missing in orð_18, since added).

Change (docs only; zero normative drift to ADR-013)

• §7(d) new prerequisite entry: the identity/config crossing the seam is governed by PLATFORM-001 (homed in views-appwrite), referenced by URL, never by copy, with its coordinate registry named as the canonical source behind unfao/appwrite_env.py's declared names.
• Post-adoption entry (2026-07-28): records the full þing-01 follow-through in this repo — P1 [þing-01] Kill the implicit ensemble-dotenv borrow; entry validation per D6 #134 (PR feat(env): þing-01 P1 (#134) — kill the ensemble-dotenv borrow; declared fail-loud entry validation #137), P2 [þing-01] Delivery-log/provenance redaction audit #135 (PR test(redaction): þing-01 P2 (#135) — delivery-log/provenance redaction audit + permanent guards #136), P3 [þing-01] P3: ADR-013 references PLATFORM-001 by URL #138 (this PR).

Verification

• Full suite 271 passed / 44 xfailed / 5 failed — the five known local pyarrow-toolchain byte-parity tests (CI authoritative). All ADR doc-guards green (§ numbering stable; bullets added only).
• Both URLs verified to resolve on origin/main of views-appwrite (private repo — org-member access, which is the audience).

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