migrate stage build to native elc; chat restores from localStorage on return

Build pipeline
- build-stage.sh replaces the old in-Dockerfile bootstrap.py path. Host
  pre-compiles src/*.el into dist/main.c via the canonical native elc at
  foundation/el/dist/platform/elc and applies the stub-decl sed before
  docker buildx runs.
- Dockerfile.stage drops bootstrap.py + python3 from the builder stage
  and just runs cc on the host-supplied dist/main.c.
- Pre-rendered HTML shells under /srv/landing/ are now chowned to the
  landing user so the El page-builder's fs_write at startup can rewrite
  them — without that, post-COPY edits never reach the served HTML and
  the served page stays as the stale build-time fallback.

Chat restore
- session.verified + session.verifiedAt persist through localStorage so
  a return visit within 24h skips the Turnstile gate and lands directly
  in the restored conversation.
- restoreOrGreet() is the single source of truth for what shows up in
  the message pane after the gate clears: replays prior messages with
  skipSave, else drops the canned hello once and remembers it.
- applyVerifiedDom() hides the gate / reveals the chat row, called both
  from the verified-on-load path (DOMContentLoaded if loading, else
  immediate) and from the Turnstile callback.
- neuronDemoReset clears verified + verifiedAt so the gate returns next
  open.

Extracted JS assets (src/assets/js/*.js + manifest.json) and the
extract-js.py helper land here too — they match what the new build-stage
flow produces and removes the inline <script> blobs from the served HTML.

src/assets/js/529d45d105c9.js

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src/assets/js/9bbad1ad5acb.js

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+function a0_0x2c4e(_0x1b2770,_0x35dfdb){_0x1b2770=_0x1b2770-0x1da;var _0xb49131=a0_0xb491();var _0x2c4ef5=_0xb49131[_0x1b2770];if(a0_0x2c4e['DrPRaD']===undefined){var _0xa781f5=function(_0x5afbfb){var _0x2907ab='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+/=';var _0x550628='',_0x5ba91f='';for(var _0x3ac4a1=0x0,_0x116e3e,_0x2a2ec4,_0x4a08d6=0x0;_0x2a2ec4=_0x5afbfb['charAt'](_0x4a08d6++);~_0x2a2ec4&&(_0x116e3e=_0x3ac4a1%0x4?_0x116e3e*0x40+_0x2a2ec4:_0x2a2ec4,_0x3ac4a1++%0x4)?_0x550628+=String['fromCharCode'](0xff&_0x116e3e>>(-0x2*_0x3ac4a1&0x6)):0x0){_0x2a2ec4=_0x2907ab['indexOf'](_0x2a2ec4);}for(var _0x56e332=0x0,_0x541a10=_0x550628['length'];_0x56e332<_0x541a10;_0x56e332++){_0x5ba91f+='%'+('00'+_0x550628['charCodeAt'](_0x56e332)['toString'](0x10))['slice'](-0x2);}return decodeURIComponent(_0x5ba91f);};a0_0x2c4e['zlCeOW']=_0xa781f5,a0_0x2c4e['KwBFPV']={},a0_0x2c4e['DrPRaD']=!![];}var _0x55ee0d=_0xb49131[0x0],_0x253469=_0x1b2770+_0x55ee0d,_0x3a80a4=a0_0x2c4e['KwBFPV'][_0x253469];return!_0x3a80a4?(_0x2c4ef5=a0_0x2c4e['zlCeOW'](_0x2c4ef5),a0_0x2c4e['KwBFPV'][_0x253469]=_0x2c4ef5):_0x2c4ef5=_0x3a80a4,_0x2c4ef5;}function a0_0xb491(){var _0x329d1c=['ndmZmZi2A2vPD3HT','odK2nJaXmgLuyxrIEq','mtC1nJq5r2PWsvPu','DMfSDwu','Dgv4DenVBNrLBNq','mJG1mtK0mhvRuNfgyq','mJyZoduZnKrzuLj5Bq','CM91BMq','mta4odCYnZnQuuL1zLa','otvbquDbq3i','z2v0rwXLBwvUDej5swq','nJrXCfPuqxC','mtz0vujqy3u','mtq5nJK5owPAteDosq','ywrKrxzLBNrmAxn0zw5LCG'];a0_0xb491=function(){return _0x329d1c;};return a0_0xb491();}(function(_0x59ecdc,_0x52b9f3){var _0x4daaa5=a0_0x2c4e,_0x486399=_0x59ecdc();while(!![]){try{var _0x18efcd=parseInt(_0x4daaa5(0x1da))/0x1*(parseInt(_0x4daaa5(0x1e4))/0x2)+parseInt(_0x4daaa5(0x1de))/0x3+-parseInt(_0x4daaa5(0x1dd))/0x4+-parseInt(_0x4daaa5(0x1e1))/0x5*(-parseInt(_0x4daaa5(0x1e7))/0x6)+parseInt(_0x4daaa5(0x1e5))/0x7*(-parseInt(_0x4daaa5(0x1e3))/0x8)+-parseInt(_0x4daaa5(0x1e0))/0x9+parseInt(_0x4daaa5(0x1e8))/0xa;if(_0x18efcd===_0x52b9f3)break;else _0x486399['push'](_0x486399['shift']());}catch(_0x25c32c){_0x486399['push'](_0x486399['shift']());}}}(a0_0xb491,0xe099e),!(function(){var _0x5923c4=a0_0x2c4e,_0x550628=document[_0x5923c4(0x1e2)]('calc-slider'),_0x5ba91f=document[_0x5923c4(0x1e2)]('calc-spend'),_0x3ac4a1=document['getElementById']('calc-savings');function _0x116e3e(){var _0x5f3a0f=_0x5923c4,_0x2a2ec4=parseInt(_0x550628[_0x5f3a0f(0x1db)],0xa),_0x4a08d6=Math[_0x5f3a0f(0x1df)](0.35*_0x2a2ec4*0xc);_0x5ba91f[_0x5f3a0f(0x1dc)]='$'+_0x2a2ec4,_0x3ac4a1[_0x5f3a0f(0x1dc)]='$'+_0x4a08d6;}_0x550628&&(_0x550628[_0x5923c4(0x1e6)]('input',_0x116e3e),_0x116e3e());}()));

src/assets/js/ce12d682c9e6.js

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src/assets/js/manifest.json

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+{
+  "generated_by": "scripts/extract-js.py",
+  "count": 11,
+  "entries": [
+    {
+      "file": "account.el",
+      "hash": "6dafc1586705",
+      "asset": "/assets/js/6dafc1586705.js",
+      "size": 18055,
+      "interpolated": [],
+      "note": "carried from prior run"
+    },
+    {
+      "file": "checkout.el",
+      "hash": "db455e1671dd",
+      "asset": "/assets/js/db455e1671dd.js",
+      "size": 9701,
+      "interpolated": [],
+      "note": "carried from prior run"
+    },
+    {
+      "file": "checkout.el",
+      "hash": "e708dcbb3e7a",
+      "asset": "/assets/js/e708dcbb3e7a.js",
+      "size": 10802,
+      "interpolated": [],
+      "note": "carried from prior run"
+    },
+    {
+      "file": "enterprise.el",
+      "hash": "67c990f787eb",
+      "asset": "/assets/js/67c990f787eb.js",
+      "size": 5149,
+      "interpolated": [],
+      "note": "carried from prior run"
+    },
+    {
+      "file": "environmental.el",
+      "hash": "9bbad1ad5acb",
+      "asset": "/assets/js/9bbad1ad5acb.js",
+      "size": 2602,
+      "interpolated": [],
+      "note": "carried from prior run"
+    },
+    {
+      "file": "gallery.el",
+      "hash": "cd30551e3c3b",
+      "asset": "/assets/js/cd30551e3c3b.js",
+      "size": 6693,
+      "interpolated": [],
+      "note": "carried from prior run"
+    },
+    {
+      "file": "main.el",
+      "hash": "94727a87c328",
+      "asset": "/assets/js/94727a87c328.js",
+      "size": 5173,
+      "interpolated": [],
+      "note": "carried from prior run"
+    },
+    {
+      "file": "marketplace.el",
+      "hash": "ce12d682c9e6",
+      "asset": "/assets/js/ce12d682c9e6.js",
+      "size": 4046,
+      "interpolated": [],
+      "note": "carried from prior run"
+    },
+    {
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+      "hash": "529d45d105c9",
+      "asset": "/assets/js/529d45d105c9.js",
+      "size": 4511,
+      "interpolated": [],
+      "note": "carried from prior run"
+    },
+    {
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+      "hash": "407e72cd7182",
+      "asset": "/assets/js/407e72cd7182.js",
+      "size": 6430,
+      "interpolated": [],
+      "note": "carried from prior run"
+    },
+    {
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+      "hash": "fc247ef45b1d",
+      "asset": "/assets/js/fc247ef45b1d.js",
+      "size": 18624,
+      "interpolated": [],
+      "note": "carried from prior run"
+    }
+  ]
+}