discord-bot: fix "no response", serialize turns, attribution, mentions, post-at-bottom

client.py: send() falls back to ResultMessage.result when no TextBlock streams
(the "(no response)" bug) and reconnects+retries once on a closed SDK session.

message_handler.py: per-thread turn lock so messages arriving mid-turn or from a
second user queue in order (nothing dropped); per-session requester-attribution
env (discord_id -> users.json key), pinned to the thread opener; _USER_MAP caches
only on a successful load; final answer posts as a fresh message at the BOTTOM
(no edit-in-place); a <@id> tag goes out as a fresh send so it actually pings.

main.py: allowed_mentions permits user pings, blocks @everyone/@here/roles.

DISCORD_CLAUDE.md: no thread auto-delete; tiered close-out (Q&A -> one-line rolling
log, substantive -> /save); @mention guidance; opener-pinned attribution note.

whoami-block.sh / sync.sh: bot-context attribution (Executed by ClaudeTools Bot /
Requested by <person>; git author = mapped requester, committer = bot). Strict
no-op for interactive sessions.

users.json: discord_id for Mike/Howard; added Winter Williams (bot-only, full trust).

Reviewed by Code Review Agent + Grok + Gemini (Gemini's "malformed email" finding
verified as a false positive).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude/scripts/whoami-block.sh

@@ -30,6 +30,34 @@ if [ -z "$PYTHON" ]; then
     exit 0
 fi
 
+# Bot-context override: the Discord bot sets CLAUDETOOLS_ACTOR=discord-bot plus
+# the requester it is acting for (CLAUDETOOLS_REQUESTER / _USER, per session).
+# Attribute the log to the BOT as executor and the human requester as originator.
+# Strict no-op when the env is unset — interactive sessions are unaffected.
+if [ "${CLAUDETOOLS_ACTOR:-}" = "discord-bot" ]; then
+    "$PYTHON" - "$ID" "$USERS" <<'BOTEOF'
+import json, os, sys
+idp, usersp = sys.argv[1], sys.argv[2]
+try:
+    machine = json.load(open(idp)).get("machine", "unknown")
+except Exception:
+    machine = "unknown"
+requester = os.environ.get("CLAUDETOOLS_REQUESTER", "an unrecognized Discord user")
+ukey = os.environ.get("CLAUDETOOLS_REQUESTER_USER", "")
+role = ""
+if ukey:
+    try:
+        role = json.load(open(usersp))["users"].get(ukey, {}).get("role", "")
+    except Exception:
+        pass
+print("## User")
+print(f"- **Executed by:** ClaudeTools Discord Bot ({machine})")
+print(f"- **Requested by:** {requester}" + (f" - {role}" if role else ""))
+print("- **Role:** automation (acting on the requester's behalf)")
+BOTEOF
+    exit 0
+fi
+
 "$PYTHON" - "$ID" "$USERS" <<'PYEOF'
 import json, sys, socket, re
 idp, usersp = sys.argv[1], sys.argv[2]