Phase 4 (final) of the native-harness working-memory sprint. OllamaProvider
.complete_with_tools now returns (text, calls, usage), surfacing the response's
real prompt_eval_count/eval_count (free — already in the payload). The native loop
EMA-smooths real/estimate into self._tok_ratio (clamped [0.5,3.0]) and prunes
against native_token_budget / ratio, so context budgeting tracks the TRUE window
instead of the systematic bias of the len//4 char estimate. Providers that omit
counts leave the ratio at 1.0, so behaviour is unchanged where unavailable — a
free correctness win, no regression. RAM-only, no disk, no new network frames.
Scope note: touches only cmd_chat/agent/ + providers — disjoint from the parallel
feat(operator) work on this branch, so it merges/reverts independently by path.
Sprint: native-harness-working-memory (Phase 4/4) — see also 46e5620, dc6317f
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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