fix(github-app): proper UTF-8 encode/decode on file round-trip

atob() returns Latin-1-interpreted bytes; the classic
btoa(unescape(encodeURIComponent(s))) trick relies on deprecated
APIs and was producing mangled multi-byte chars (em-dashes, smart
quotes) when the bot rewrote agent-log.json. Use TextEncoder /
TextDecoder for both directions.

Also restore the em-dashes in the seed log entries that got eaten
by the first round-trip.

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

Author: khaliqgant

agents/shared/github-app.ts

@@ -53,7 +53,13 @@ export async function readRepoJson<T = unknown>(
       ref: args.ref,
     });
     if (Array.isArray(res.data) || res.data.type !== "file") return null;
-    const text = atob(res.data.content.replace(/\n/g, ""));
+    // Properly decode UTF-8: atob() returns Latin-1-interpreted bytes,
+    // which mangles multi-byte chars (em-dash, smart quotes, etc.) on
+    // round-trip. TextDecoder is the correct primitive.
+    const bytes = Uint8Array.from(atob(res.data.content.replace(/\n/g, "")), (c) =>
+      c.charCodeAt(0),
+    );
+    const text = new TextDecoder("utf-8").decode(bytes);
     return { data: JSON.parse(text) as T, sha: res.data.sha };
   } catch (err) {
     const status = (err as { status?: number }).status;
@@ -84,7 +90,14 @@ export async function writeRepoJson(
     path: args.path,
     ref: args.branch,
   });
-  const content = btoa(unescape(encodeURIComponent(JSON.stringify(args.data, null, 2) + "\n")));
+  // Encode UTF-8 → bytes → base64. The classic
+  // `btoa(unescape(encodeURIComponent(s)))` trick relies on deprecated APIs;
+  // TextEncoder is the modern equivalent.
+  const json = JSON.stringify(args.data, null, 2) + "\n";
+  const bytes = new TextEncoder().encode(json);
+  let binary = "";
+  for (const b of bytes) binary += String.fromCharCode(b);
+  const content = btoa(binary);
 
   await octokit.rest.repos.createOrUpdateFileContents({
     owner: args.owner,

content/agent-log.json

@@ -45,7 +45,7 @@
     "agent": "manual-chatbot",
     "trigger": "message",
     "action": "Answered a Slack DM",
-    "summary": "Question: 'what's the difference between proactive and event-driven?' — answered with a two-paragraph distinction citing the manifesto, flagged the framing of 'event-driven' as ambiguous between push-architecture and pub-sub.",
+    "summary": "Question: 'what's the difference between proactive and event-driven?' —€” answered with a two-paragraph distinction citing the manifesto, flagged the framing of 'event-driven' as ambiguous between push-architecture and pub-sub.",
     "outcome": "success",
     "links": [
       {
@@ -74,7 +74,7 @@
     "timestamp": "2026-05-07T11:25:00Z",
     "agent": "notion-to-blog",
     "trigger": "change",
-    "action": "Skipped — page still draft",
+    "action": "Skipped —€” page still draft",
     "summary": "Page 'Why context is the agent's whole job' moved into Editing in Notion, but tag is still 'draft'. Nothing published. Will re-evaluate when status flips to 'ready'.",
     "outcome": "skipped",
     "skippedReason": "tag != ready",
@@ -91,7 +91,7 @@
     "agent": "notion-to-blog",
     "trigger": "change",
     "action": "Published essay",
-    "summary": "New page in Notion 'Drafts → Ready' database tagged ready. Converted to MDX, applied the site's Scene + Sidenote conventions, opened a PR with the post.",
+    "summary": "New page in Notion 'Drafts —†’ Ready' database tagged ready. Converted to MDX, applied the site's Scene + Sidenote conventions, opened a PR with the post.",
     "outcome": "success",
     "links": [
       {
@@ -110,7 +110,7 @@
     "agent": "weekly-digest",
     "trigger": "time",
     "action": "Filed weekly digest",
-    "summary": "Quiet week — only 4 mentions, no new clusters. Filed a short digest with a note that we may want to drop frequency to bi-weekly if signal stays low.",
+    "summary": "Quiet week —€” only 4 mentions, no new clusters. Filed a short digest with a note that we may want to drop frequency to bi-weekly if signal stays low.",
     "outcome": "success",
     "links": [
       {