feat: add rich Slack progress drafts

docs/.generated/config-baseline.sha256

@@ -1,4 +1,4 @@
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+953aece02c70b8df690b51e865a4aea838b53bbe9d43ef9495f80f719a831e38  config-baseline.json
 31ec333df9f8b92c7656ac7107cecd5860dd02e08f7e18c7c674dc47a8811baa  config-baseline.core.json
-655d1309b70505e73198df20c5088784290b33098efd42027d3c09beeb3704a7  config-baseline.channel.json
-9458dc89aa13dd07d83f69d943535099a96e8278eb7ac8ae5cf2f713631592f7  config-baseline.plugin.json
+e10ba2f29f25fc665b96c714075af954eed686c56ca12783cf1f49498f86ac98  config-baseline.channel.json
+606641569764473005f8343f4550500dcbe99cf54e1dc21960018cf455912196  config-baseline.plugin.json

docs/.generated/plugin-sdk-api-baseline.sha256

@@ -1,2 +1,2 @@
-701356478634a8f3e71f941ed21a00e0456d947d287edcafb56231013b27a057  plugin-sdk-api-baseline.json
-ed17426dd5e9db4b83db77162e7490eee3c0439170c1a9d1e84c01d7027d580c  plugin-sdk-api-baseline.jsonl
+2943ada651fd9a07c9e715a90ad4a76f725a1b60fa142dcfd504ba6d6c202ed4  plugin-sdk-api-baseline.json
+ff31408a26bcad4c54dc0c897d0103ca3d7dc91b3394a3ab65e7dade0c3f6ff5  plugin-sdk-api-baseline.jsonl

docs/concepts/progress-drafts.md

@@ -223,6 +223,27 @@ OpenClaw truncates long progress lines by default so repeated draft edits do not
 wrap differently on every update. The prefix stays readable, and long details
 such as paths or raw commands are shortened with an ellipsis.
 
+Slack can render progress lines as structured Block Kit fields instead of a
+single text body:
+
+```json5
+{
+  channels: {
+    slack: {
+      streaming: {
+        mode: "progress",
+        progress: {
+          render: "rich",
+        },
+      },
+    },
+  },
+}
+```
+
+Rich rendering keeps the same plain-text fallback so channels and clients that
+do not support the richer shape can still show the compact progress text.
+
 Keep the single progress draft but hide tool and task lines:
 
 ```json5