Add lexicon code generation tooling

- Install @atproto/lex-cli for generating TypeScript types from lexicons
- Add npm scripts:
- codegen: Generate TS client API from lexicons
- update-lexicons: Update vendored lexicons from tangled.org

Co-Authored-By: Claude Sonnet 4.5 <[e-mail]>

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package.json

···
     "lint:fix": "biome check --write .",
     "format": "biome format --write .",
     "typecheck": "tsc --noEmit",
-    "prepublishOnly": "npm run build"
+    "prepublishOnly": "npm run build",
+    "codegen": "npx lex gen-api --yes ./src/lexicon ./lexicons/sh/tangled/**/*.json",
+    "update-lexicons": "./scripts/update-lexicons.sh"
   },
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···
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     "url": "[e-mail]:markbennett.ca/tangled-cli"
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   "author": "Mark Bennett",
   "license": "MIT",
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