docs: sweep after the fleet fixes; approve the 1.0 spec

- README: custody chain and receipts replace epidemic forwarding; Ack
  frame; running on a robot (host crates, current limits); security;
  crate layout, constants and reading list.
- AGENTS.md: current spec list, receipt constraints and review focus
  7-8, first_seq rule, constants, host crates and the ros2 gate.
- THREAT_MODEL.md: re-checked at 89041ea. F1, F2, F5, F17 fixed; F3
  (single configured peer) and F4 partly fixed; new F18 (no scheduled
  flush, stale clock marker).
- CHANGELOG: Unreleased section for the fleet milestone and fixes.
- tines-bt README: single-peer limit; manual BLE check not yet recorded.
- tines service rustdoc: oversized-frame behaviour, JSON tagging, clock.
- 1.0 spec: approved (2026-10-20), including §10 and the adversarial
  fuzz mode.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/superpowers/specs/2026-10-18-tines-1-0-design.md

@@ -1,10 +1,11 @@
 # tines-core 1.0 — design
 
 Date: 2026-10-18
-Status: draft v6. Kyle decided D1–D5 and Q1–Q3 (2026-10-18) and the
-review decisions R1–R3 and the `observed_at` definition (2026-10-19);
-review fixes applied. v6 adds §10 (core hardening from `THREAT_MODEL.md`)
-and the adversarial fuzz mode; these additions aren't reviewed yet.
+Status: approved by Kyle (2026-10-20). Kyle decided D1–D5 and Q1–Q3
+(2026-10-18) and the review decisions R1–R3 and the `observed_at`
+definition (2026-10-19); review fixes applied. v6 added §10 (core hardening
+from `THREAT_MODEL.md`) and the adversarial fuzz mode; Kyle reviewed and
+approved both (2026-10-20).
 Builds on: `2026-10-16-tines-design.md`, `2026-10-18-tines-addressed-delivery.md`,
 `2026-10-18-tines-fleet-deployment-design.md` (assumed fully implemented)