fix(agent-core): count validation-rejected tool calls toward the repeat breaker (#2313)

* fix(agent-core): count validation-rejected tool calls toward the repeat breaker

Args-rejected calls returned before prepareToolExecution, so the breaker
never counted them and the model could re-issue the same invalid call
until maxSteps. Register them in finalizeToolResult so reminders fire at
3/5/8 and the turn force-stops at 12.

* fix(agent-core): key parse-failed repeats on raw argument text

Malformed JSON arguments normalize to {} on parse failure, which keyed
every malformed-but-different attempt identically and could force-stop a
turn whose calls were evolving rather than identical. Register skipped
calls on the raw arguments text when parsing failed.

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Co-authored-by: fengchenchen <fengchenchen@moonshot.ai>