feat(dream): add reflection skill and 12h reminder

Replay the last 24h of a repository — git log and reflog, CI, reviews,
memory, session transcripts — score every action as held, broke or unknown
against its evidence, harden the resulting hypotheses with dialectic, and
persist what survives. The objective is a measurably more confident next
run: a class of error counts as closed only once a test, check, hook or
written rule prevents it.

Derived improvements to the code and to the agent instructions are offered
as single-select questions, and the run ends in autotune and autoskill.

The reminder hook stamps into each repository's git dir, so every repo
carries its own twelve-hour cadence and the hook stays silent outside a
git repository.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/test_autotune.py

@@ -85,7 +85,7 @@ class TestSettingsRegistration(unittest.TestCase):
             encoding="utf-8",
         )
         data = self._patch()
-        self.assertEqual(len(data["hooks"]["UserPromptSubmit"]), 2)
+        self.assertEqual(len(data["hooks"]["UserPromptSubmit"]), 3)
 
 
 if __name__ == "__main__":