Cameron 3e15159d83 fix: prevent human block overwrite when skills block missing (#7656) ...

* fix: prevent human block overwrite when skills block missing

**Bug**: When connecting to agents created before skills blocks were
standard, the human block gets overwritten with skills directory content.

**Root cause**: agent_manager.py:1893-1898 had `block = block` (no-op).
When skills block doesn't exist, loop variable ends as last block in
core_memory (often "human"), then updates that wrong block.

**Fix**: Use `matched_block` variable to properly track found block.
Now correctly raises NoResultFound when block label doesn't exist.

**Impact**: Affects pre-December 2025 agents missing skills blocks.

Written by Cameron ◯ Letta Code

"The best error message is the one that never shows up." - Thomas Fuchs

Co-Authored-By: Letta <noreply@letta.com>

* fix: use correct method name in block update test

Change get_block_by_label_async to get_block_with_label_async in test.

Written by Cameron ◯ Letta Code

Co-Authored-By: Letta <noreply@letta.com>

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Co-authored-by: Letta <noreply@letta.com>

2026-01-12 10:57:19 -08:00

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