fix(tunnel): close the three leftovers from the renewal-deadlock fix

1. `.gitignore` swallowed a source file. `agent/src/dist/buildBinary.ts` is the
   packaging config, not build output, but the blanket `dist/` rule meant it was
   never committed — a fresh clone could neither typecheck `agent/src/index.ts`
   nor import it from the committed `agent/test/buildBinary.test.ts`. Re-included
   the DIRECTORY first (git does not descend into an excluded one, so un-ignoring
   just the file would not have worked) and committed the file. Verified build
   output under `agent/dist/`, `dist/`, `public/build/` is still ignored.

2. Tunnel logs named no host. `pair` learned hostId/subdomain from the enroll
   response and threw them away, so the long-running `run` process logged
   `{"subdomain":null,"hostId":null}` — including all 6380 warnings during the
   8-day outage, at exactly the moment you want to know which host. New
   `config/hostRecord.ts` persists them at enrol; `resolveHostIdentity` resolves
   config > record > the subdomain embedded in the leaf's SPIFFE SAN, so hosts
   enrolled before the record existed get an identifier back without re-pairing.

3. The phone track had no recovery path. Added `POST /device/:id/recover`,
   mirroring the host route: cert in the body, device-CA path validation, SPIFFE
   parse, `notBefore` never graced, and the full registry check (active + same
   account + `:id` matches the cert + same key) — only `notAfter` is relaxed.

Verified: agent 300/300, control-plane 296/296, tsc clean on both.
NOTE: the iOS/Android clients are not wired to call /device/:id/recover yet —
the server capability exists, the client-side trigger does not.

agent/src/certs/nativeRenew.ts

@@ -18,6 +18,7 @@
  */
 import { request as httpsRequest } from 'node:https'
 import type { AgentConfig } from '../config/agentConfig.js'
+import { resolveHostIdentity } from '../config/hostRecord.js'
 import type { Keystore } from '../keys/keystore.js'
 import type { Logger } from '../log/logger.js'
 import type { TimerLike } from '../transport/seams.js'
@@ -265,5 +266,8 @@ export function startNativeAutoRenew(
       ? { retryBackoff: createBackoff({ baseMs: opts.retryBaseMs, jitter: false }) }
       : {}),
   })
-  return wireAutoRenew(rotator, hooks, logger, { subdomain: cfg.subdomain, hostId: cfg.hostId })
+  // Prefer the resolved identity (config > enrolment record > leaf SPIFFE SAN) so renewal warnings
+  // actually name the host — `cfg` alone is null on every install that predates the record.
+  const ids = resolveHostIdentity(cfg, () => ks.loadCert()?.certPem ?? null)
+  return wireAutoRenew(rotator, hooks, logger, ids)
 }