use block events for llm stats

[LasmarKhalifa]

close #908

Current LLM stats output (after "Repeat log prefix on each line of multi-line output" is merged):

Proposed new LLM stats output:

[LasmarKhalifa]

• use block events for llm stats #902 👈 (View in Graphite)
• Use block events in Pi agent cogs #901
• Use block events in chat cogs #900
• Use block events in claude #899
• Add a block type event #898
• Repeat log prefix on each line of multi-line output #893
• main

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[LasmarKhalifa]

Merge activity

• Jun 2, 1:21 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jun 2, 1:22 PM UTC: Graphite rebased this pull request as part of a merge.
• Jun 2, 1:22 PM UTC: @LasmarKhalifa merged this pull request with Graphite.