Remove policy scripts

Rhai made a decision about a route cost one to three microseconds,
some two hundred times what the same costs in Rust. That was bearable
where a function is asked once for an UPDATE, and is not where every
route is weighed against every peer, as it is when routes are passed
on. What is wanted of a policy (mark routes by where they came from,
mark what is announced, let communities say who is told what) needs no
language; it is to be configuration, done natively.

Kept from that work: route selection goes by a LOCAL_PREF that policy
set on a route from an external peer, and the lab's configuration can
be added to by a phase.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

crates/web/static/statusz.html

@@ -123,10 +123,6 @@ from <select id="lookup-peer"><option value="">any peer</option></select>
   const esc = s => String(s).replace(/[&<>"']/g, c => ({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c]));
   const state = { status: null, peers: [], local: [], received: [], receivedPage: {}, refused: [], rpki: null, kernel: null };
   const DASH = '<span class="dim">-</span>';
-  // The functions of the policy script a peer's routes go through.
-  const policy = p => (p.import_function || p.export_function)
-    ? ` <span class="dim" title="Functions of the policy script: for routes from the peer, and for routes to it">${[p.import_function && 'in: ' + esc(p.import_function), p.export_function && 'out: ' + esc(p.export_function)].filter(Boolean).join(', ')}</span>`
-    : '';
 
   // ---- helpers -----------------------------------------------------------
   const fmtDur = s => {
@@ -186,7 +182,7 @@ from <select id="lookup-peer"><option value="">any peer</option></select>
       const up = p.state === 'Established';
       const detail = p.state === 'Backoff' ? `${esc(p.last_error || '')}; retry in ${until(p.retry_at_unix)}` : '';
       return `<tr>
-        <td>${p.name ? esc(p.name) : '<span class="dim">(inbound)</span>'}${policy(p)}</td><td class="mono">${esc(p.peer_addr)}</td><td>${p.peer_asn}${p.role ? ` <span class="dim" title="${p.role_confirmed ? 'The peer says so too (RFC 9234)' : 'By our configuration; the peer has not said what it is'}">${esc(p.role)}${p.role_confirmed ? ' &check;' : ''}</span>` : ''}</td>
+        <td>${p.name ? esc(p.name) : '<span class="dim">(inbound)</span>'}</td><td class="mono">${esc(p.peer_addr)}</td><td>${p.peer_asn}${p.role ? ` <span class="dim" title="${p.role_confirmed ? 'The peer says so too (RFC 9234)' : 'By our configuration; the peer has not said what it is'}">${esc(p.role)}${p.role_confirmed ? ' &check;' : ''}</span>` : ''}</td>
         <td><span class="${STATE_CLASS[p.state] || ''}">${esc(p.state)}</span></td><td>${up ? (p.direction === 'outbound' ? 'us' : 'peer') : DASH}</td>
         <td class="mono">${up ? esc(p.local_addr) : DASH}</td><td>${up ? fmtTime(p.established_at_unix) : DASH}</td>
         <td>${up ? age(p.established_at_unix) : DASH}</td><td>${up ? (p.four_octet_asn ? 'yes' : 'no') : DASH}</td>