Tests were failing because they relied on the old default limit of 20,000:
- test_memory.py: "x " * 50000 = 100,000 chars now equals the limit
instead of exceeding it. Increased to "x " * 60000 (120k chars).
- test_block_manager.py: Block created with default limit (now 100k),
then 30k char update no longer exceeds it. Set explicit limit=20000
on the test block to preserve the test intent.
- test_log_context_middleware.py: Removed stale `limit: 20000` from
dummy frontmatter fixtures to match new serialization behavior.
Related to #9537
Co-authored-by: letta-code <248085862+letta-code@users.noreply.github.com>
Co-authored-by: Kian Jones <kianjones9@users.noreply.github.com>
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