docs: explain ATProto doc publishing in readme

the readme now explains that zat publishes its own docs as
site.standard.document records - dogfooding the protocol.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.tangled/workflows/deploy-docs.yml

···
 
 dependencies:
   nixpkgs:
-    - nodejs
-    - coreutils
+    - bun
     - curl
 
 environment:
-  # Use DID directly to avoid handle-resolution issues in CI.
   WISP_DID: "did:plc:mkqt76xvfgxuemlwlx6ruc3w"
   WISP_SITE_NAME: "docs"
 
 steps:
   - name: build docs site
     command: |
-      node ./scripts/build-wisp-docs.mjs
+      bun ./scripts/build-wisp-docs.mjs
 
   - name: deploy docs to wisp
     command: |

CHANGELOG.md

···
 # changelog
 
+## 0.1.1
+
+- xrpc client sets `Content-Type: application/json` for POST requests
+- docs published as `site.standard.document` records on tag releases
+
 ## 0.1.0
 
 sync types for firehose consumption:

README.md

···
 # [zat](https://zat.dev)
 
-AT Protocol building blocks for zig. [roadmap](docs/roadmap.md) · [atproto records](https://at-me.zzstoatzz.io/view?handle=zat.dev)
+AT Protocol building blocks for zig.
+
+<details>
+<summary><strong>this readme is an ATProto record</strong></summary>
+
+→ [view in zat.dev's repository](https://at-me.zzstoatzz.io/view?handle=zat.dev)
+
+zat publishes these docs as [`site.standard.document`](https://standard.site) records, signed by its DID.
+
+</details>
 
 ## install
 
···
 ## license
 
 MIT
+
+---
+
+[roadmap](docs/roadmap.md) · [changelog](CHANGELOG.md)

scripts/publish-docs.zig

···
     return null;
 }
 
-fn timestamp() [24]u8 {
+fn timestamp() [20]u8 {
     const epoch_seconds = std.time.timestamp();
     const days: i32 = @intCast(@divFloor(epoch_seconds, std.time.s_per_day));
     const day_secs: u32 = @intCast(@mod(epoch_seconds, std.time.s_per_day));
···
     const mins = (day_secs % 3600) / 60;
     const secs = day_secs % 60;
 
-    var buf: [24]u8 = undefined;
+    var buf: [20]u8 = undefined;
     _ = std.fmt.bufPrint(&buf, "{d:0>4}-{d:0>2}-{d:0>2}T{d:0>2}:{d:0>2}:{d:0>2}Z", .{
         @as(u32, @intCast(y)), @as(u32, @intCast(m + 1)), @as(u32, @intCast(remaining + 1)), hours, mins, secs,
     }) catch unreachable;