Adds exitCode to AgentInfo type and propagates it through all toAgentInfo()
implementations. Enhances getAgent to also return taskName and initiativeName
from their respective repositories. Adds two new filesystem-reading tRPC
procedures for the Agent Details tab: getAgentInputFiles (reads .cw/input/
files with binary detection, 500 KB cap, sorted) and getAgentPrompt (reads
.cw/agent-logs/<name>/PROMPT.md with 1 MB cap and structured ENOENT handling).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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