feat(pi): forward resolved system prompt via --append-system-prompt

[Kunde21]

Summary

Resolves the coding system prompt via resolveEffectiveCodingPromptText (providerId: 'pi') in createPiAcpRuntime and forwards it as the --append-system-prompt spawn flag through buildPiRpcArgs, mirroring how the claude backend resolves and forwards its system prompt.

Changes

• apps/cli/src/backends/pi/acp/runtime.ts / backend.ts: resolve + forward the coding system prompt.
• apps/cli/src/backends/pi/runPi.ts: pass the resolved prompt through.
• packages/.../createCatalogProviderAcpRuntime.ts: adds a generic async resolveBackendOptions hook.

Draft — opening for early review.

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Note

Forward resolved system prompt to Pi process via --append-system-prompt

• Adds appendSystemPromptText to PiBackendOptions and extends buildPiRpcArgs in backend.ts to append --append-system-prompt to the spawned Pi process args when a non-blank value is provided.
• Adds resolveBackendOptions callback support to createCatalogProviderAcpRuntime in createCatalogProviderAcpRuntime.ts, allowing async resolution of backend options before backend construction.
• In runtime.ts, createPiAcpRuntime now resolves the effective coding system prompt via resolveEffectiveCodingPromptText when credentials are available, passing it as appendSystemPromptText.
• runPi.ts passes credentials and accountSettings into createPiAcpRuntime to enable the dynamic prompt resolution.
• Risk: if system prompt resolution fails, the Pi process starts without --append-system-prompt (silent fallback to empty options).

^{Macroscope summarized cc2d23e. (Automatic summaries will resume when PR exits draft mode or review begins).}

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