Treat SystemParts as an alternative representation of message Content
rather than an additive one. This prevents systematic overestimation
of system message tokens which could trigger premature context
pruning or summarization.
- Picks the maximum of Content vs. SystemParts to stay conservative.
- Adds a per-part overhead (20 chars) to account for JSON metadata.
- Streamlines the ReasoningContent counting logic.
Fixes a deficiency where structured blocks for cache-aware adapters
caused overestimated budgets or hidden overflows.
Badgerbees
1a44752dc5