Fix pi-rpc host runtime protocol dispatch

[christso]

Summary

• Align pi-rpc with the installed Pi RPC JSONL protocol by sending type: \"prompt\" commands instead of JSON-RPC method: \"run\" requests.
• Keep Pi RPC stdin open until agent_end or a prompt response failure, then close it so the host runtime can finish cleanly.
• Build Pi RPC host commands/env the same way pi-cli does for local OpenAI-compatible endpoints, including OpenAI+base_url normalization to Pi's Azure-compatible provider path.
• Preserve legacy parser tolerance while mapping current Pi command failures and assistant stopReason=error messages to target_task_failure.

Validation

• bun test packages/core/test/evaluation/providers/pi-runtime.test.ts
• bun --filter @agentv/core typecheck
• bun node_modules/.bin/biome check packages/core/src/evaluation/providers/pi-process.ts packages/core/src/evaluation/providers/pi-rpc.ts packages/core/src/evaluation/providers/targets.ts packages/core/test/evaluation/providers/pi-runtime.test.ts
• git diff --check
• bun --filter @agentv/core build
• Live host dogfood: bun apps/cli/src/cli.ts eval run .agentv/results/av-t2o5-5-inputs/live-marker.eval.yaml --targets .agentv/results/av-t2o5-5-inputs/targets.yaml --target pi-rpc-local --grader-target local-openai-grader --workers 1 --threshold 0.8 --keep-workspaces passed with run 2026-07-05T03-49-47-220Z.

Evidence

• Prior red evidence: EntityProcess/agentv-private:evidence/av-y7eq-9-host-runtime-live-matrix commit f714ec1, failed run 2026-07-05T03-21-39-969Z, Unknown command: undefined.
• Green evidence: EntityProcess/agentv-private:evidence/av-t2o5-5-pi-rpc-live commit 7417c402c62b7eb4a2bb2640c45dc327c3b063ce.

Bead

• av-t2o5.5

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