v6.0.19

Auto-released from merge of PR #1198 (trigger: push).

• Template label refresh — _version, _supportedMaxTested, and the user-agent header bumped to 2.1.260 to track @anthropic-ai/claude-code@latest. The live wire shape is unchanged — cc-drift-template-watch ran capture-and-bake --check against live CC v2.1.260 and found zero shape drift vs the bundle — so this is a label refresh, not a re-capture (_captured stays at the last real capture). Auto-merged; clears the sdk-drift early-warning signal.

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Built + tested + npm-published inline by cc-drift-auto-release.yml on this run — tokenless via OIDC trusted publishing, provenance-attested. See the workflow log for the publish output.