feat(web): add downloads page and wire account download card

The funnel dead-ended at "we'll email you" — there was no downloads
surface. Add a real /downloads page in the landing template style
(shared nav + footer + page shell) with client-side navigator.platform
OS detection. macOS (Apple Silicon .dmg) is featured as the shipping
build; Windows (.msi) and Linux (.deb/.AppImage) are linked but clearly
marked "coming soon" to match current product state — Windows chat and
the Linux soul backend are not yet ready, so presenting them as fully
working would overpromise.

Also un-break the account dashboard download card, which was hardcoded
disabled ("Shipping within 30 days"). It now links the live macOS
installer plus the full /downloads page.

src/account.el

@@ -800,11 +800,17 @@ fn account_download_card() -> String {
     el_div(
         "class=\"card-dark\" style=\"border-top:3px solid var(--navy)\"",
         el_p("class=\"card-label\"", "Download") +
-        el_p("class=\"download-status\" style=\"color:var(--navy)\"", "Shipping within 30 days") +
-        el_p("class=\"download-title\"", "Neuron for Mac & Windows") +
-        el_p("class=\"download-body\"", "macOS and Windows simultaneously. You'll receive a download link and license key by email the moment it ships. Nothing to do right now.") +
-        el_button("type=\"button\" class=\"download-btn-disabled\" disabled aria-disabled=\"true\"",
-            account_signin_svg_download() + " Download arriving soon"
+        el_p("class=\"download-status\" style=\"color:var(--navy)\"", "Available now — macOS") +
+        el_p("class=\"download-title\"", "Neuron for Mac") +
+        el_p("class=\"download-body\"", "The macOS build (Apple Silicon) is ready to download now. Windows and Linux are coming soon. Your license key is in your launch email.") +
+        el_div(
+            "style=\"display:flex;gap:.75rem;flex-wrap:wrap;align-items:center\"",
+            el_a(
+                "https://downloads.neurontechnologies.ai/installers/Neuron-1.1.0-macos-arm64.dmg",
+                "class=\"btn-primary\" download",
+                account_signin_svg_download() + " Download for macOS"
+            ) +
+            el_a("/downloads", "class=\"btn-ghost\"", "All platforms →")
         )
     )
 }

src/checkout.el

@@ -98,7 +98,7 @@ fn checkout_page(plan: String, pub_key: String) -> String {
         el_li("", "Persistent memory - never resets")
         + el_li("", "Local inference via Ollama (coming)")
         + el_li("", "Bring your own API keys")
-        + el_li("", "3 marketplace plugins included")
+        + el_li("", "Plugin marketplace access (coming soon)")
         + el_li("", "Core built-in capabilities")
         + el_li("", "2 devices included")
     } else {

src/downloads.el

@@ -0,0 +1,148 @@
+// components/downloads.el - Public downloads page.
+//
+// Landing-styled inner page (page_open_seo + nav + content + footer +
+// page_close, assembled by main.el). Client-side OS detection via
+// navigator.platform highlights the visitor's platform and updates the
+// detected-OS banner. macOS is the shipping build; Windows and Linux are
+// linked but clearly marked "coming soon" per the current product state
+// (Windows chat not yet enabled, Linux soul backend not yet complete).
+
+from nav    import { nav }
+from footer import { footer }
+
+extern fn el_section(attrs: String, children: String) -> String
+extern fn el_div(attrs: String, children: String) -> String
+extern fn el_span(attrs: String, children: String) -> String
+extern fn el_h1(attrs: String, text: String) -> String
+extern fn el_p(attrs: String, children: String) -> String
+extern fn el_a(href: String, attrs: String, children: String) -> String
+
+// Scoped presentation. Uses the landing stylesheet's CSS variables
+// (--navy, --head, --body, --t2, --t3) so it inherits the site palette.
+// No # colors or quoted font names inline — routed through vars to stay
+// clear of the elc CSS tokenizer edge cases.
+fn dl_style() -> String {
+    "<style>" +
+    ".dl-wrap{max-width:960px}" +
+    ".dl-detected{font-size:.85rem;font-weight:500;color:var(--navy);margin:1.5rem 0 2.5rem;min-height:1.2em}" +
+    ".dl-card{padding:2rem}" +
+    ".dl-featured{border-top:3px solid var(--navy)}" +
+    ".dl-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-top:1.5rem}" +
+    "@media (max-width:720px){.dl-grid{grid-template-columns:1fr}}" +
+    ".dl-badge{display:inline-block;font-size:.6rem;font-weight:700;letter-spacing:.18em;text-transform:uppercase;padding:.35rem .7rem;border-radius:999px;margin-bottom:1rem}" +
+    ".dl-badge-ready{color:var(--navy);background:rgba(0,82,160,.10)}" +
+    ".dl-badge-soon{color:var(--t3);background:rgba(0,0,0,.05)}" +
+    ".dl-title{font-family:var(--head);font-size:1.4rem;font-weight:600;margin-bottom:.4rem}" +
+    ".dl-sub{font-family:var(--body);font-weight:300;font-size:.9rem;color:var(--t2);line-height:1.6;margin-bottom:1.25rem}" +
+    ".dl-note{font-size:.78rem;color:var(--t3);line-height:1.6;margin-top:1rem}" +
+    ".dl-btnrow{display:flex;gap:.75rem;flex-wrap:wrap;align-items:center}" +
+    "[data-detected=true]{box-shadow:0 0 0 2px rgba(0,82,160,.45);border-radius:2px}" +
+    "</style>"
+}
+
+fn dl_header() -> String {
+    el_p("class=\"label reveal\"", "Download") +
+    el_h1("class=\"display-lg reveal\" style=\"margin-top:.75rem\"", "Get Neuron.") +
+    el_div("class=\"navy-line-left reveal\" style=\"width:4rem;margin:1.5rem 0 2rem\"", "") +
+    el_p(
+        "class=\"dl-sub reveal\" style=\"max-width:34rem;font-size:1rem\"",
+        "Your AI that remembers you, running on your own machine. macOS is available to download today. Windows and Linux are on the way."
+    ) +
+    el_p("id=\"os-detected\" class=\"dl-detected reveal\"", "Detecting your platform&#8230;")
+}
+
+fn dl_mac_card() -> String {
+    el_div(
+        "id=\"card-mac\" class=\"card-dark dl-card dl-featured reveal\"",
+        el_span("class=\"dl-badge dl-badge-ready\"", "Available now") +
+        el_p("class=\"dl-title\"", "Neuron for macOS") +
+        el_p("class=\"dl-sub\"", "Apple Silicon (M1&#8211;M4). macOS 13 Ventura or later.") +
+        el_div(
+            "class=\"dl-btnrow\"",
+            el_a(
+                "https://downloads.neurontechnologies.ai/installers/Neuron-1.1.0-macos-arm64.dmg",
+                "class=\"btn-primary\" download",
+                "Download for macOS &#8594;"
+            )
+        ) +
+        el_p("class=\"dl-note\"", "Version 1.1.0 &middot; Apple Silicon &middot; .dmg")
+    )
+}
+
+fn dl_windows_card() -> String {
+    el_div(
+        "id=\"card-windows\" class=\"card-dark dl-card reveal\"",
+        el_span("class=\"dl-badge dl-badge-soon\"", "Coming soon") +
+        el_p("class=\"dl-title\"", "Neuron for Windows") +
+        el_p("class=\"dl-sub\"", "Windows 10 and 11 (x64).") +
+        el_div(
+            "class=\"dl-btnrow\"",
+            el_a(
+                "https://downloads.neurontechnologies.ai/installers/Neuron-1.1.0-windows-x64.msi",
+                "class=\"btn-ghost\" download",
+                "Download .msi"
+            )
+        ) +
+        el_p(
+            "class=\"dl-note\"",
+            "The Windows build is still landing &mdash; this link may not be live yet. Chat is not enabled on Windows in this release."
+        )
+    )
+}
+
+fn dl_linux_card() -> String {
+    el_div(
+        "id=\"card-linux\" class=\"card-dark dl-card reveal\"",
+        el_span("class=\"dl-badge dl-badge-soon\"", "Coming soon") +
+        el_p("class=\"dl-title\"", "Neuron for Linux") +
+        el_p("class=\"dl-sub\"", "Debian / Ubuntu (.deb) or portable (.AppImage), x64.") +
+        el_div(
+            "class=\"dl-btnrow\"",
+            el_a(
+                "https://downloads.neurontechnologies.ai/installers/Neuron-1.1.0-linux-x64.deb",
+                "class=\"btn-ghost\" download",
+                "Download .deb"
+            ) +
+            el_a(
+                "https://downloads.neurontechnologies.ai/installers/Neuron-1.1.0-linux-x64.AppImage",
+                "class=\"btn-ghost\" download",
+                "Download .AppImage"
+            )
+        ) +
+        el_p(
+            "class=\"dl-note\"",
+            "Linux packages install today, but the on-device soul backend is still being finished. Full support is coming soon."
+        )
+    )
+}
+
+fn dl_fineprint() -> String {
+    el_p(
+        "class=\"dl-note reveal\" style=\"margin-top:2.5rem\"",
+        "All installers are served from downloads.neurontechnologies.ai. After checkout your license key arrives by email &mdash; manage it from your " +
+        el_a("/account", "style=\"color:var(--navy)\"", "account") +
+        "."
+    )
+}
+
+// Inline OS detection. CSP allows script-src 'unsafe-inline'. Single-quoted
+// JS, ASCII only, no // comments — keeps the .el string simple and avoids
+// tokenizer surprises.
+fn dl_script() -> String {
+    "<script>(function(){var p=(navigator.platform||'')+' '+(navigator.userAgent||'');var os='mac';if(/Win/i.test(p)){os='windows';}else if(/Linux|X11/i.test(p)&&!/Android/i.test(p)){os='linux';}else if(/Mac/i.test(p)){os='mac';}var L={mac:'macOS',windows:'Windows',linux:'Linux'};var b=document.getElementById('os-detected');if(b){b.textContent=(os==='mac')?'We detected macOS on this device. You are ready to download.':('We detected '+L[os]+'. '+L[os]+' support is coming soon; macOS is available to download today.');}var c=document.getElementById('card-'+os);if(c){c.setAttribute('data-detected','true');}})();</script>"
+}
+
+fn downloads_content() -> String {
+    let grid: String = el_div("class=\"dl-grid\"", dl_windows_card() + dl_linux_card())
+    el_section(
+        "id=\"downloads\" aria-label=\"Download Neuron\"",
+        el_div(
+            "class=\"container dl-wrap\"",
+            dl_header() + dl_mac_card() + grid + dl_fineprint()
+        )
+    )
+}
+
+fn downloads_page() -> String {
+    return nav() + dl_style() + downloads_content() + footer() + dl_script()
+}

src/main.el

@@ -87,6 +87,7 @@ from checkout        import { checkout_page }
 from safety          import { safety }
 from gallery         import { gallery_page }
 from account         import { account_page }
+from downloads       import { downloads_page }
 
 // ── Share-card HTML allowlist ─────────────────────────────────────────────────
 //
@@ -1971,6 +1972,15 @@ fn handle_request_inner(method: String, path: String, headers: Map, body: String
         ) + badge_css + success_body + page_close()
     }
 
+    // ── Downloads ─────────────────────────────────────────────────────────────
+    // Public installer page. macOS ships today; Windows/Linux linked but marked
+    // coming soon. Live-rendered like /about (page shell wraps downloads_page()).
+    if str_starts_with(path, "/downloads") {
+        let dl_title: String = "Download Neuron - macOS, Windows & Linux"
+        let dl_desc: String = "Download Neuron for macOS. Your AI that remembers you, running on your own machine. Windows and Linux support is on the way."
+        return page_open_seo(dl_title, dl_desc, "/downloads", dl_desc, "false") + downloads_page() + page_close()
+    }
+
     // ── Account dashboard ─────────────────────────────────────────────────────
     // Use prefix match so OAuth/email-confirmation redirects with query strings still hit.
     if str_starts_with(path, "/account") {

src/marketplace.el

@@ -77,7 +77,7 @@ fn marketplace_categories() -> String {
 
     el_div(
         "class=\"marketplace-categories reveal\" style=\"transition-delay:320ms\"",
-        marketplace_tags_block("Connectors - day one", connectors) +
+        marketplace_tags_block("Connectors (rolling out)", connectors) +
         marketplace_tags_block("Following launch", following) +
         el_div(
             "",

src/pricing.el

@@ -36,7 +36,7 @@ fn pricing_free_features() -> String {
     el_li("", el_span("class=\"dash\"", "-") + el_span("", "Local inference via Ollama (coming)")) +
     el_li("", el_span("class=\"dash\"", "-") + el_span("", "Neuron Inference included when it launches - Q3 2026")) +
     el_li("", el_span("class=\"dash\"", "-") + el_span("", "Unlimited projects")) +
-    el_li("", el_span("class=\"dash\"", "-") + el_span("", "3 marketplace plugins included")) +
+    el_li("", el_span("class=\"dash\"", "-") + el_span("", "Plugin marketplace access (coming soon)")) +
     el_li("", el_span("class=\"dash\"", "-") + el_span("", "Core built-in capabilities"))
 }