Remove stale v0.8.59 release docs (release-notes-v0.8.59.md, docs/V0_8_59_RELEASE_TRIAGE.md) now that v0.8.59 is shipped.
Clear three clippy release-gate lints: const-evaluate the DEFAULT_SPAWN_DEPTH ceiling assert, and allow the intentional await_holding_lock on two Z.ai routing tests that must hold the test-env mutex across the await.
Credit new 0.8.60 models and first-party provider routes in the changelog: GLM-5.2 (Z.ai + OpenRouter), first-party Z.ai, StepFun/StepFlash (step-3.7-flash), and MiniMax (MiniMax-M3) routes (#3187/#3191). Regenerate the embedded crates/tui/CHANGELOG.md slice.
Hunter B
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