[codex] add native multisig relay Worker

[gakonst]

Summary

• adds a standalone apps/native-multisig-relay Cloudflare Worker for Tempo native multisig approvals
• backs pending multisig operations with a dedicated KV namespace and optional configured sponsorship
• adds a Prool/Miniflare e2e script that runs against the local accounts checkout and local Tempo binary when available

Notes

• this is intentionally separate from apps/fee-payer
• the e2e path currently depends on [codex] add multisig relay handling accounts#613 for native multisig relay support and the fee-payer signature normalization fix pushed there

Validation

• node_modules/.bin/biome check --write apps/native-multisig-relay/test/helpers.ts apps/native-multisig-relay/test/e2e.test.ts apps/native-multisig-relay/src apps/native-multisig-relay/*.ts apps/native-multisig-relay/scripts/test-e2e.sh
• node_modules/.bin/tsgo --project apps/native-multisig-relay/tsconfig.json --noEmit
• apps/native-multisig-relay/scripts/test-e2e.sh

[github-actions]

Bundle Size Report

Metric	Size	Δ Change
Total	5.1 MB	+852.4 KB (+19.7%)
Gzip	1.5 MB	+240.4 KB (+19.3%)
Brotli	1.3 MB	+210.5 KB (+19.4%)

Chunk changes (>1KB)

Chunk	Change
assets/chains.js (removed)	-360.7 KB
assets/export-rate-limit.js (removed)	-177.3 KB
assets/decodeAbiParameters.js (removed)	-71.7 KB
assets/AbiItem.js (removed)	-27.1 KB
assets/Bytes.js (removed)	-25.8 KB
assets/env.js	-9.5 KB
assets/validators.js (removed)	-5.1 KB
assets/wagmi.config.js	-4.4 KB
assets/readContracts.js (removed)	-2.7 KB
assets/_hash.js	+1.6 KB
assets/.js	+1.6 KB
assets/queryOptions.js	+1.9 KB
assets/tokenlist.js	+1.9 KB
assets/router.js	+2.0 KB
assets/_address.js	+2.0 KB
assets/known-event-totals.js (new)	+2.1 KB
assets/Address.js	+3.4 KB
assets/call.js	+3.8 KB
assets/Errors.js (new)	+3.9 KB
assets/sha3.js (new)	+5.2 KB
...and 12 more

Compared against main branch (baseline from 4/27/2026, 4:02:54 PM)