fix(integrations-claude-code): label 'Current time' as UTC in recall context (#1568)

The recall hook injects "Current time - <ts>" into <hindsight_memories>
without a timezone label, while the value is computed in UTC. Client
LLMs running in non-UTC timezones often misread this as local time —
e.g. a 2026-05-10 23:55 UTC stamp prompts a Claude Code session in JST
(local 2026-05-11 08:55) to remark "sounds like a good place to wrap
up for the day."

The opencode integration already labels its equivalent line with " UTC"
(hindsight-integrations/opencode/src/hooks.ts:117). Aligning claude-code
with that convention removes the foot-gun.

Author: valda

hindsight-integrations/claude-code/scripts/lib/content.py

@@ -221,10 +221,13 @@ def format_memories(results: list) -> str:
 def format_current_time() -> str:
     """Format current UTC time for recall context.
 
+    The "UTC" suffix is explicit so client LLMs do not misread the
+    value as local time when reasoning about wall-clock context.
+
     Port of: formatCurrentTimeForRecall() in index.js
     """
     now = datetime.now(timezone.utc)
-    return now.strftime("%Y-%m-%d %H:%M")
+    return now.strftime("%Y-%m-%d %H:%M UTC")
 
 
 # ---------------------------------------------------------------------------

hindsight-integrations/claude-code/tests/test_content.py

@@ -1,11 +1,14 @@
 """Tests for lib/content.py — pure content-processing functions."""
 
+import re
+
 import pytest
 
 from lib.content import (
     _extract_text_content,
     _is_channel_message_tool,
     compose_recall_query,
+    format_current_time,
     format_memories,
     prepare_retention_transcript,
     slice_last_turns_by_user_boundary,
@@ -469,3 +472,18 @@ def test_without_tool_calls_uses_text_format(self):
         transcript, _ = prepare_retention_transcript(msgs, retain_full_window=True, include_tool_calls=False)
         assert "[role: user]" in transcript
         assert "[user:end]" in transcript
+
+
+# ---------------------------------------------------------------------------
+# format_current_time
+# ---------------------------------------------------------------------------
+
+
+class TestFormatCurrentTime:
+    def test_includes_utc_suffix(self):
+        # The "UTC" suffix prevents client LLMs from misreading the
+        # timestamp as local time.
+        assert format_current_time().endswith(" UTC")
+
+    def test_format_shape(self):
+        assert re.fullmatch(r"\d{4}-\d{2}-\d{2} \d{2}:\d{2} UTC", format_current_time())