fix: stop parliament accept starvation on outbound dial (0.9.22)

Peer dial used per-step read timeouts so a stuck handshake could block the
single-threaded daemon for tens of seconds; inbound hellos piled up unread
(CLOSE-WAIT). Use a wall-clock dial budget, drain accepts before each dial,
skip self, and only one side initiates idle polls.

Co-authored-by: Cursor <cursoragent@cursor.com>

include/cst_peer.h

@@ -24,6 +24,7 @@ typedef struct {
 } cst_peer_session_t;
 
 /* Dial host:port, prove our cert, verify theirs, establish AEAD session.
+ * timeout_ms is a wall-clock budget for connect+handshake+kx (not per-read).
  * Leaves sock open for post-handshake sync; call cst_peer_close. */
 int cst_peer_dial(const char *host, int port, const cst_realm_cert_t *self,
                   const uint8_t self_sk[64], const uint8_t realm_pk[32],