docs: update changelog for Slack mention hints (#82152)

CHANGELOG.md

@@ -20,6 +20,7 @@ Docs: https://docs.openclaw.ai
 - Codex app-server: limit canonical OpenAI Codex app-server attribution rewrites to local transcript and trajectory records, leaving runtime/tool routing on the selected OpenAI model metadata so OpenAI API-key backup profiles keep their billing path.
 - Android/chat: make bare and markdown URLs in chat messages tappable by preserving Compose URL annotations in rendered markdown. Fixes #82187. (#82392) Thanks @neeravmakwana.
 - Plugins/doctor: migrate legacy top-level plugin `tools` declarations into `contracts.tools`, so `openclaw doctor --fix` repairs local plugins for the manifest tool contract. (#81112) Thanks @100yenadmin.
+- Slack: guide agents to use stable `<@USER_ID>` mention tokens from context instead of plain `@name` text, so user mentions link and notify correctly. Fixes #82090. (#82152) Thanks @neeravmakwana.
 - Codex app-server: release raw assistant completions when `turn/completed` is missing while keeping commentary/status items as progress, preventing completed Codex runs from hanging until timeout. Fixes #82343. (#82403) Thanks @IWhatsskill.
 - Agents/sessions: remove the transient `*.bak-<pid>-<ts>` backup written by `repairSessionFileIfNeeded` once the atomic replace succeeds, so a stuck session with a persistently malformed JSONL line no longer accumulates one snapshot per repair invocation. Fixes #80960. (#80969) Thanks @100yenadmin. Co-authored by @tynamite.
 - CLI/status: show plain empty-state messages instead of empty Channels and Sessions tables when no channels or sessions exist.