fix(cowork): stabilize subagent progress tracking

[btc69m979y-dotcom]

Summary

• derive subagent progress from local subagent_runs instead of relying on model-authored announce text
• correct stale subagent announce progress after chat.final, including the observed 5/5 local state rendered as 3/5
• preserve failed spawn rows while appending retry replacements and fix terminal subagent duration display
• keep diagnostic logs for subagent announce/history reconciliation paths

Verification

• npx eslint --ext ts,tsx --report-unused-disable-directives --max-warnings 0 src/main/libs/agentEngine/openclawRuntimeAdapter.ts src/main/libs/agentEngine/openclawRuntimeAdapter.test.ts src/main/libs/agentEngine/subagentTracker.ts src/main/libs/agentEngine/subagentTracker.test.ts src/main/subagentRunStore.ts src/renderer/components/agentSidebar/SubagentTaskRow.tsx src/renderer/components/agentSidebar/useSubagentSessions.ts src/renderer/types/cowork.ts src/renderer/types/electron.d.ts
• npx tsc --noEmit --pretty false --project electron-tsconfig.json
• npx vitest run src/main/libs/agentEngine/openclawRuntimeAdapter.test.ts --testNamePattern "deterministic subagent progress|child chat final marks matching subagent done|child lifecycle end marks matching subagent done|empty subagent announce final|empty final with local tool messages"
• git diff --check (CRLF warnings only)

Note

• src/main/libs/agentEngine/subagentTracker.test.ts could not be executed in this local shell because the installed better-sqlite3 native module was built for a different Node ABI.

[btc69m979y-dotcom]

Closing in favor of a narrower sidebar terminal duration fix.