1. Set tool_executed=true when a tool call is detected, even if skipped
as a duplicate. This prevents the raw JSON from being printed to screen
when a tool call is detected but not executed.
2. Remove session-level duplicate detection entirely. All tools should be
allowed to be called multiple times in a session.
3. Fix sequential duplicate detection to only catch IMMEDIATELY sequential
duplicates:
- DUP IN CHUNK: Now only checks if the PREVIOUS tool call in the chunk
is the same (not any tool call in the chunk)
- DUP IN MSG: Now only checks if the LAST tool call in the previous
message matches AND there's no text after it. If there's any
non-whitespace text between tool calls, they're not considered
duplicates.
This allows legitimate re-use of tools while still catching cases where
the LLM stutters and outputs the same tool call twice in a row.
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