v2.7.31

What's Changed

• fix: scope fallback provider params per model entry (0d66a94)
• Preserve recorded context usage for legacy conversations (ba501a8)
• Describe compaction in terms of the context measurement (5ad61ad)
• Pair each context measurement with the messages its request covered (87f507d)
• Salvage only the latest LLM span so a failed call does not duplicate the previous output (3e46d41)
• Cut the unsent estimate at the last model output and count the tail in every branch (5c753ea)
• Drop comments that restate the code (7773fbb)
• Document the compaction signal: last call, unsent messages, run model window (6d74bbd)
• Take the last LLM span directly and make the run-model test fail on a wrong model (b559952)
• Count the messages sent after the last reported usage toward utilization (efab932)
• Measure compaction utilization against the last LLM call and the run's model (7cf8251)

Full Changelog: v2.7.30...v2.7.31