fix(agent): reuse a valid lease token across applies; a rate-limited lease no longer blocks a deploy; 0.1.6

Every apply requested a new lease, so a failing deploy retried by the 60 s
timer burned tenancy's 5-leases-per-hour budget and then failed on
LEASE_RATE_LIMITED forever (env-qa-02 pilot). Now: reuse a lease-derived
token while lookup-self says it is valid; swap the bootstrap token for a
lease once; if tenancy rate-limits the lease while a working token exists,
apply with it and defer the swap.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KLB7jieMNRkTsJ2epr4Ds1

tests/test_agent.py

@@ -107,7 +107,7 @@ def test_rollback_refused_unless_allowed(bootstrapped, tenancy, fake_docker):
     tenancy.set_files(first)
     assert tick(cfg) == EX_FAIL
     assert tenancy.reports[-1]["result"] == "failed" and "ROLLBACK_REFUSED" in tenancy.reports[-1]["detail"]
-    assert len(tenancy.leases) == 2  # a refused bundle never leases
+    assert len(tenancy.leases) == 1  # a refused bundle never leases; the 2nd apply reused the lease token
     tenancy.set_files(make_files(meta={"agent": {"allow_rollback": True}}))
     assert tick(cfg) == EX_OK
 
@@ -246,10 +246,9 @@ def test_legacy_approle_lease_is_refused_loudly(bootstrapped, tenancy, fake_dock
     assert "compose up" not in fake_docker.subcommands()
 
 
-def test_lease_rate_limited_is_temporary(bootstrapped, tenancy, fake_docker):
-    cfg = bootstrapped
-    tenancy.lease_limit = 0
-    assert tick(cfg) == EX_TEMPFAIL
+# (test_lease_rate_limited_is_temporary was retired in 0.1.6: a rate-limited lease is only a
+# temporary failure when NO working token exists; with one, the agent applies and defers the swap —
+# see test_rate_limited_lease_does_not_block_an_apply_when_a_token_exists.)
 
 
 def test_unhealthy_after_up_reports_failed_with_compose_logs(bootstrapped, tenancy, fake_docker):
@@ -320,3 +319,27 @@ def test_write_private_mode(tmp_path):
     p = tmp_path / "d" / "f"
     statemod.write_private(p, b"x")
     assert oct(p.stat().st_mode & 0o777) == "0o600" and not any(n.startswith(".f.") for n in os.listdir(p.parent))
+
+
+def test_second_apply_reuses_the_lease_token(bootstrapped, tenancy, bao, fake_docker):
+    """A valid lease-derived token is reused: a new bundle does NOT lease again (5/h budget —
+    env-qa-02 pilot: a retried deploy re-leased every 60 s and hit LEASE_RATE_LIMITED forever)."""
+    cfg = bootstrapped
+    assert tick(cfg) == EX_OK
+    assert len(tenancy.leases) == 1
+    tenancy.set_files(make_files(manifest=make_manifest(versions={"gemini_api_key": 1})))
+    assert tick(cfg) == EX_OK
+    assert len(tenancy.leases) == 1  # reused
+    st = statemod.load(cfg.state_path, ENV)
+    assert st.applied_sha == tenancy.desired_sha and st.token.source == "lease"
+
+
+def test_rate_limited_lease_does_not_block_an_apply_when_a_token_exists(bootstrapped, tenancy, bao, fake_docker):
+    """tenancy 429 on lease while the bootstrap token still works → apply with it, swap deferred."""
+    cfg = bootstrapped
+    tenancy.lease_limit = 0
+    assert tick(cfg) == EX_OK
+    assert tenancy.leases == []
+    st = statemod.load(cfg.state_path, ENV)
+    assert st.applied_sha == tenancy.desired_sha and st.token.source == "bootstrap"
+    assert tenancy.reports[-1]["result"] == "applied"