Add chat-memory module: MessageWindowChatMemory, JDBC and Redis repositories, per-user conversation IDs

Real PostgreSQL 16 and Redis Stack 7.4; 24 tests write output/01-24. Covers the 20-message
default window with no property, the 36-character conversation_id, tool messages dropped by
JdbcChatMemoryRepository, concurrent add() on one conversation, a 1.x table under the 2.0
repository, the Redis repository silently backing off for a custom ChatMemory, and the
removal of PromptChatMemoryAdvisor.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Ja4jkzrbQ4LQZBNrb5mkZE
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Claude
2026-09-24 15:56:47 +00:00
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# TokenBudgetChatMemory, budget = 120 tokens
three short turns: S:Be terse. | U:short question 1 | A:short answer 1 | U:short question 2 | A:short answer 2 | U:short question 3 | A:short answer 3
then one pasted trace: 7 messages kept: S:Be terse. | U:short question 2 | A:short answer 2 | U:short question 3 | A:short answer 3 | U:<pasted stack trace, 89 tokens> | A:Check the datasource URL.