docs: CLAUDE.md — Slack notification rule (#claude-code channel)

When the Slack MCP connector is available in a session, post to
#claude-code on: blocking questions, long-task completion (outcome +
compare link), and idle. Explicitly not a progress-narration channel.

Signed-off-by: artiz <artem.kustikov@gmail.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EY5KAiquN4YpVf2PXEQkVT

Author: artiz

CLAUDE.md

@@ -17,6 +17,12 @@ validated for byte-for-byte conformance against upstream Python docling.
   work.
 - Issue numbers (`#80`, `#138`, …) refer to `docling-project/docling.rs`
   issues; reference them in commit messages (`Refs #NN`).
+- **Slack notifications** (when the Slack MCP connector is available): post to
+  **#claude-code** (channel ID `C0BKAHN0BSM`) when (a) a question blocks the
+  work and needs the maintainer's answer, (b) a long task finishes — include
+  the outcome and the compare link, (c) idle/bored — the queue is empty;
+  suggest what to pick up next. Keep it to these events; don't narrate
+  routine progress there.
 
 ## Workspace map