test(wallet): cover WalletAction status/disconnect + availableToStake

[MuncleUscles]

Closes concrete unit-test gaps on the browser-wallet surface (follow-up to #367).

What's added

• tests/actions/walletStatusDisconnect.test.ts (10 tests) — mirrors the mocking style of walletConnect.test.ts (mocked sessionDescriptor + WalletSessionClient), fully hermetic.
  • WalletAction.status: no descriptor → No active wallet session. + exit 1; live connected → prints the status object (address/network/chainId/port/url/heartbeat/queuedTransactions) + exit 0; live-but-connecting → connecting + exit 1; stale tab heartbeat → reports stale (still exit 0); stale descriptor via dead pid and via failed ping → warn + removeDescriptor + exit 1 (state never read).
  • WalletAction.disconnect: no descriptor → message, no throw, no client; live daemon clean exit → shutdown() + removeDescriptor + no SIGTERM; pid lingers → SIGTERM fallback then cleanup; racing exit (waitForPidGone false but pid already gone) → no SIGTERM, still cleans up. process.kill spied so no real signal is sent.
• tests/libs/availableToStake.test.ts (4 tests) — direct coverage of vestingAvailableToStake: revoked → 0n with getBalance never called; not-revoked → returns getBalance({address}) asserted against the vesting address; zero-balance passthrough; failing read propagates (no silent 0).

Scope

Primary deliverables A/B/C only. No Tier-1 D item added: the E2E design's Tier-1 candidates (resolver chain-mismatch/degrade/error modes, sessionClient.waitForTxResult timeout/tab-closed fail-fast, config-default resolveWalletMode) are already covered by existing sessionResolver/sessionClient/walletSession specs; the bridge result-store GC is a private method reachable only by driving the full HTTP loop, not a cheap standalone unit spec.

Verification

• npm run build clean.
• npx vitest run full suite green: 72 files, 747 tests passed (+14 from this PR).
• tsc --noEmit baseline unchanged (32 pre-existing SDK-typing errors; zero in the new files).

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