feat(snapshot): modul-skelett

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

snapshot/.gitignore

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+output/
+.last-snapshot.json

snapshot/README.md

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+# snapshot/
+
+Liest die `kind:30023`-Events des Site-Autors von den Read-Relays und
+schreibt sie als JSON-Artefakte für den SvelteKit-Prerender-Schritt.
+Kein Live-Proxy: Relays werden nur zur Build-Zeit befragt.
+
+Spec: [`../docs/superpowers/specs/2026-04-21-prerender-snapshot-design.md`](../docs/superpowers/specs/2026-04-21-prerender-snapshot-design.md)
+
+## Nutzung
+
+```sh
+cd snapshot
+deno task snapshot                    # default
+deno task snapshot --out ./output     # alternatives Ziel
+deno task snapshot --min-events 20    # Schwelle
+deno task snapshot --allow-shrink     # Drop-Check aus
+```
+
+Erwartet diese Env-Vars (aus `../.env.local`):
+
+- `AUTHOR_PUBKEY_HEX` (64 hex chars)
+- `BOOTSTRAP_RELAY` (wss-URL)

snapshot/deno.jsonc

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+{
+  "tasks": {
+    "snapshot": "deno run --env-file=../.env.local --allow-env --allow-read --allow-write --allow-net src/cli.ts",
+    "test": "deno test --allow-env --allow-read --allow-write --allow-net",
+    "fmt": "deno fmt",
+    "lint": "deno lint"
+  },
+  "imports": {
+    "@std/yaml": "jsr:@std/yaml@^1.0.5",
+    "@std/cli": "jsr:@std/cli@^1.0.6",
+    "@std/fs": "jsr:@std/fs@^1.0.4",
+    "@std/path": "jsr:@std/path@^1.0.6",
+    "@std/testing": "jsr:@std/testing@^1.0.3",
+    "@std/assert": "jsr:@std/assert@^1.0.6",
+    "@std/encoding": "jsr:@std/encoding@^1.0.5",
+    "nostr-tools": "npm:nostr-tools@^2.10.4",
+    "applesauce-relay": "npm:applesauce-relay@^2.0.0",
+    "rxjs": "npm:rxjs@^7.8.1"
+  },
+  "fmt": {
+    "lineWidth": 100,
+    "indentWidth": 2,
+    "semiColons": false,
+    "singleQuote": true
+  },
+  "lint": {
+    "rules": {
+      "tags": ["recommended"]
+    }
+  }
+}