loop: StopReasonMaxTurns to flag budget exhaustion (closes #93)

[erain]

Summary

• New loop.StopReasonMaxTurns (re-exported as glue.StopReasonMaxTurns).
• loop.Run tags the last assistant message in both Messages and NewMessages with this stop reason when the budget is exhausted while tool calls are pending. Transcript shape and the returned error are otherwise unchanged.
• design.md "Agent Loop" section documents the new outcome.

Use case: an agent that wants to retry with a higher budget can now distinguish "ran out of turns" from "model errored mid-stream" — StopReasonToolUse previously covered both cases.

Stacked on #95–#99. Closes #93.

Test plan

• go build ./...
• go vet ./...
• go test ./loop -run "MaxTurns|NaturalStop" — new tests cover budget-exhaustion tagging and the natural-stop path stays StopReasonStop
• go test . ./loop ./prompts ./providers/... ./tools/... — all green

🤖 Generated with Claude Code

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