cache-bust local assets; narrow the language facet to scores >= 3

Part 1 — asset versioning: every local <script src> and <link rel=stylesheet> on the
tracked pages now carries ?v=<sha256-of-the-file> (10 hex), computed at BUILD time from
the file's bytes by work/build-asset-versions.py — never hand-typed, and idempotent
(re-running with no file change rewrites nothing). This is what makes an edited
focus-rule.js / photo-upload.js a new URL instead of a stale cache hit.

Part 2 — language facet: a language now counts for the Language filter only when its
0-5 self-assessment is >= LANG_FACET_MIN (3 = 'works in it'). The constant sits beside
the 15-point rule in the page script and its mirror in build-directory.py. Nothing
stored changes; the card's languages chart still prints every language above 0, the
search box is unchanged, and the facet stays an exact membership test against the
card's value. A '1' language no longer offers the person under that language.

index.html

@@ -230,14 +230,14 @@
       .bf-topbar-cta{color:var(--brass);white-space:nowrap}
       .bf-topbar:hover .bf-topbar-cta,.bf-topbar:focus-visible .bf-topbar-cta{color:var(--brass-bright)}
     </style>
-    <link rel="stylesheet" href="style.css" />
+    <link rel="stylesheet" href="style.css?v=3332fbba93" />
   <!-- Privacy-friendly analytics by Plausible -->
 <script async src="https://plausible.office.odoo4projects.com/js/pa-NhA7Rf-79VopXFQXhSS4e.js"></script>
 <script>
   window.plausible=window.plausible||function(){(plausible.q=plausible.q||[]).push(arguments)},plausible.init=plausible.init||function(i){plausible.o=i||{}};
   plausible.init()
 </script>
-  <script defer src="/static/lang.js"></script>
+  <script defer src="/static/lang.js?v=3ec49a7e62"></script>
 </head>
   <body>
     <!--
@@ -701,7 +701,7 @@
     </footer>
 
     <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.12.5/gsap.min.js"></script>
-    <script src="script.js"></script>
-    <script defer src="/static/agent-odoo4projects/agent.js"></script>
+    <script src="script.js?v=d2046e3469"></script>
+    <script defer src="/static/agent-odoo4projects/agent.js?v=c3bb0cee2b"></script>
   </body>
 </html>