v0.1.7-rc1

One artifact that runs on both harness lines: 0.1.5-rc.1 .. 0.1.5-rc.3 and 0.1.7-rc.1.

Peer ranges are now >=0.1.5-rc.1 <0.1.6-0 || >=0.1.7-rc.1 <0.1.8-0, and a runtime probe (src/compat.ts) picks the right shape for the generation it booted on.

Compatibility fixes

• Remote contribution codec shape. The strict validator moved from { typeSymbol, schema } to { typeSymbol, create: () => schema }; the descriptor now carries both, so either registry accepts it. Without this the session-scoped Remote never mounted and the composer's engine picker sat on 「读取中」 forever, while the settings page (a different path) looked fine.
• Agent-presets roster read. Prefer readDocument (0.1.7) and fall back to read (0.1.5).
• Protected system/message head. A session that started on a hosted engine and later ran the harness loop used to fail the V3→V4 migration (system/message requires a protected first surface head). Each driver now writes one empty-content head on the session's first step, only while no surface event exists yet. Gated off on 0.1.5, which cannot drive that event.

Chat turn-status row

• One row selector per harness generation: [class$="_turnStatus"] (0.1.5) and button[data-turn-process] [class$="_label"] (0.1.7, whose row is a button and whose CSS-module classes are [hash]_[local]).
• The gradient sweep is re-supplied by the plugin: 0.1.7's row is plain tertiary text.
• The whole sheet is now gated on a mid-turn attribute (data-loop-engine-running, from session.running), so the 0.1.7 row stops painting once the turn it belongs to has ended — that row stays on screen afterwards as the collapsed 「用时 X 秒」 summary.

Verification

The same suite is run against both generations: 62 files / 1152 cases, each green. 0.1.7 runs through pnpm run test:coverage (per-file 100%); the 0.1.5 line runs through vitest.config.compat015.ts against the isolated .compat-015/ dependency set. Both pnpm run typecheck and the build are green, and the published bundle was verified as served by running dsh web on both generations.