v0.12.239 — follow blockrun's 07-28 free re-probe; fee back to $0.001

Catches up with blockrun's 2026-07-28 free-model re-probe (blockrun #309) and the 2026-07-29 fee revert (blockrun #319). Verified live against the gateway before syncing.

Changed — free/mistral-large-3-675b is EOL at NVIDIA (HTTP 410)

• blockrun's 07-28 re-probe got 410 Gone on both passes. Removed from the FREE_MODELS auto-pick cascade, the picker, and the eco SIMPLE fallback chain — a server-redirected dead model in the cascade silently defeats /exclude. Explicit pins stay routable (gateway redirects to gpt-oss-120b).
• mistral-free re-aimed at free/mistral-nemotron, the last live free Mistral.
• free/deepseek-v4-flash stays: slow on real prompts (~10 tok/s) but completing, and the only 1M-context free model.
• Free count is now 7 (chat-visible total: 65) across README, SKILL.md, and brand markers.

Changed — per-transaction fee mirrored back to $0.001

• blockrun reverted the flat settlement fee to $0.001/tx. estimateAmount() and README follow. Payments were always server-quoted — the old value only over-reserved pre-checks by $0.001/call.

Security — dependency refresh

• openclaw dev dep → 2026.7.1; overrides added for brace-expansion, fast-uri, tar, hono, jayson>uuid (merged into the single existing overrides block); lockfile regenerated. tsup bundles runtime deps, so the override floors ship in dist.