fix(pairing): retry all bunker admin RPCs past transient timeouts (#38)

The get_key_tokens retry only covered an empty token list; a transient
NsecBunkerTimeoutError on any admin RPC still failed pairing with a 502 (seen
live on aio-demo: create_new_key and get_key_tokens both 15s-timed-out, then a
manual retry succeeded). Generalise to `_bunker_retry`, wrapping every admin
call in the pair_spire chain (create_new_key, ensure_policy, create_new_token,
get_key_tokens): a NsecBunkerTimeoutError (and, for get_key_tokens, an empty
list) is transient → retry with backoff; a NsecBunkerRpcError rejection or
misconfig is terminal → fail fast. create_new_key is replace-by-name and
ensure_policy reconciles idempotently, so retrying on timeout is safe.

Also: _validate_relay now rejects a host-less ws:// (mint was laxer than the
consumer's parseSpireSeed), and stale "nostrclient" comments in the pair UI +
a test are corrected to "transport relay".

229 tests pass (incl. timeout-retry + fail-fast-rejection coverage).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_pairing.py

@@ -297,6 +297,55 @@ def test_pair_raises_when_tokens_stay_empty(monkeypatch):
     assert calls["n"] == 5  # exhausted all attempts
 
 
+def test_create_new_key_retries_past_transient_timeout(monkeypatch):
+    # A bunker timeout on any admin RPC (here create_new_key) is transient (#38).
+    import spirekeeper.pairing as pairing_mod
+    from lnbits.core.services.nsec_bunker import NsecBunkerTimeoutError
+
+    async def _no_sleep(*_a, **_k):
+        pass
+
+    monkeypatch.setattr(pairing_mod.asyncio, "sleep", _no_sleep)
+
+    bunker = FakeBunker(token_secret="s")  # pragma: allowlist secret
+    real = bunker.create_new_key
+    calls = {"n": 0}
+
+    async def flaky(name, passphrase):
+        calls["n"] += 1
+        if calls["n"] == 1:
+            raise NsecBunkerTimeoutError("no response for 'create_new_key' within 15.0s")
+        return await real(name, passphrase)
+
+    bunker.create_new_key = flaky
+    result = _pair(bunker)
+    assert calls["n"] == 2  # timed out once, then succeeded
+    assert result.spire_npub == _SPIRE_NPUB
+
+
+def test_bunker_rejection_fails_fast_without_retry(monkeypatch):
+    # A real rejection (NsecBunkerRpcError) is terminal — no retry.
+    import spirekeeper.pairing as pairing_mod
+    from lnbits.core.services.nsec_bunker import NsecBunkerRpcError
+
+    async def _no_sleep(*_a, **_k):
+        pass
+
+    monkeypatch.setattr(pairing_mod.asyncio, "sleep", _no_sleep)
+
+    bunker = FakeBunker()
+    calls = {"n": 0}
+
+    async def rejecting(name, passphrase):
+        calls["n"] += 1
+        raise NsecBunkerRpcError("policy rejected")
+
+    bunker.create_new_key = rejecting
+    with pytest.raises(PairingError, match="bunker admin RPC failed"):
+        _pair(bunker)
+    assert calls["n"] == 1  # terminal — not retried
+
+
 def test_bunker_relay_defaults_to_spire_event_relay():
     """No explicit bunker_relay -> the relay baked into bunker_url is the spire's
     own public event relay (relays[0]), NOT lnbits's internal bunker URL. This