Save in-progress keysat integration and StartOS 0.4 work

Snapshot of the working tree before cleanup. Captures:
- Keysat licensing: server/license.js, /api/license/* endpoints in
  server/index.js, activation modal in public/index.html, embedded
  Ed25519 issuer key (assets/issuer.pub).
- StartOS 0.4 expansion: setApiKey action, version files v0.1.1
  through v0.1.15, file-models/config.json.ts, manifest updates.
- Self-hosted registry server (startos-registry/).
- Build/deploy scripts (bin/bump-version.sh, bin/deploy.sh, vendored
  yt-dlp binary), .gitignore, .deploy.env.example.
- Recent design docs (KEYSAT_INTEGRATION.md, UPGRADE-DESIGN.md) —
  retained here so they remain recoverable when removed in the
  follow-up cleanup commit.

startos-registry/node_modules/escape-html/Readme.md

@@ -0,0 +1,43 @@
+
+# escape-html
+
+  Escape string for use in HTML
+
+## Example
+
+```js
+var escape = require('escape-html');
+var html = escape('foo & bar');
+// -> foo & bar
+```
+
+## Benchmark
+
+```
+$ npm run-script bench
+
+> escape-html@1.0.3 bench nodejs-escape-html
+> node benchmark/index.js
+
+
+  http_parser@1.0
+  node@0.10.33
+  v8@3.14.5.9
+  ares@1.9.0-DEV
+  uv@0.10.29
+  zlib@1.2.3
+  modules@11
+  openssl@1.0.1j
+
+  1 test completed.
+  2 tests completed.
+  3 tests completed.
+
+  no special characters    x 19,435,271 ops/sec ±0.85% (187 runs sampled)
+  single special character x  6,132,421 ops/sec ±0.67% (194 runs sampled)
+  many special characters  x  3,175,826 ops/sec ±0.65% (193 runs sampled)
+```
+
+## License
+
+  MIT