Replace the substring-based _memory_matches() with a token-overlap
matcher that tokenizes both memory content and response, applies
lightweight stemming (trailing s/ed/ing) and stop-word removal, then
checks whether >= 70% of the memory's tokens appear in the response.
This fixes the paraphrase blindness that prevented reinforcement from
ever firing on natural responses ("prefers" vs "prefer", "because
history" vs "because the history").
7 new tests (26 total reinforcement tests, all passing).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Anto01
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