test(ui): non-blocking startup hydration invariant — first usable load (first-5 strike F2 port)

[0xSolace]

What & why

Ports the non-blocking-startup regression contract from milady-ai/milady#2209
(wrong repo — the demo deploys from here) to elizaOS/eliza.

The milady code fix is not needed on this repo. eliza's
runHydrating() already runs every shell-decoration fetch
(getWalletAddresses, getConfig, getStreamSettings, fetchAutonomyReplay)
inside decorateShellAfterReady(), fired after dispatch({ type: "HYDRATION_COMPLETE" })
(the #15178 lineage; last touch #16292). The serial-await structure milady#2209
targeted does not exist on this path.

So this PR lands the durable piece: a regression test that pins that
deferral so a future refactor cannot silently re-await a slow decoration call
on the ready critical path (the exact regression class milady#2209 fixed).

packages/ui/src/state/startup-phase-hydrate.nonblocking.test.ts — hangs every
non-critical dependency forever and proves:

• HYDRATION_COMPLETE still fires (<3s);
• the wallet fetch is kicked off but its setter never runs before completion →
  proves it's off the critical path;
• autonomy replay is invoked but never awaited pre-completion.

Where the demo stall actually is (receipts)

A live staging startup-trace (window.__ELIZA_STARTUP_TRACE__, #9565) shows the
canary's ~13.6s post-login stall is not in the hydrate window:

coordinator mark	at (ms)
first-run-required	1763
starting-runtime	14195
hydrating	14208
ready	18365

The 12.4s cost is first-run-required → starting-runtime (login/session establish

• agent-base resolution), and hydrating → ready (~4s) is dominated by the
  post-ready agent-base fetch waterfall + lazy chunk loads — not the awaits
  milady#2209 removed. Full decomposition + follow-up levers in
  projects/eliza-fleet/F2-PORT-2026-07-22.md.

Test evidence

bun run test -- src/state/startup-phase-hydrate
 ✓ …nonblocking.test.ts (3)     <-- new
 Test Files  6 passed (6)   Tests  37 passed (37)
biome check …nonblocking.test.ts → clean

Reference: milady-ai/milady#2209
Part of the first-5-minutes demo strike (F2 port).

Co-authored-by: shadow shadow@shad0w.xyz