feat(ux): squads log command

[agents-squads]

Summary

• Adds squads log command that reads run history from .agents/observability/executions.jsonl
• Shows timestamp, squad/agent, duration, status, and cost per run in a formatted table
• Supports --squad, --agent, --limit (default 20), --since, --json flags
• Gives returning users immediate visibility into whether their agents ran and succeeded

Closes #692

Test plan

• squads log shows empty state message when no runs exist
• squads log --json returns [] when no runs exist
• squads log --help shows correct usage and examples
• squads log --squad NAME filters by squad
• Table renders correctly with status icons and cost formatting
• npm run build passes

Generated with Claude Code

[agents-squads]

CI Failure Diagnosis (ops-worker scan)

PR #712 has real test failures blocking merge — not just the Node 20/22 build issue affecting PR #696.

Failures

Test	Error
test/lib/workflow.test.ts (5 failed)	TypeError: Cannot read properties of undefined (reading 'match') at workflow.ts:73 in loadFocusPrompt
test/e2e/first-run.e2e.test.ts (1 failed)	AssertionError: expected [ 'company', 'demo', …(3) ] to deeply equal [ 'company', 'intelligence', …(2) ] — squad name mismatch

Root cause

loadFocusPrompt at src/lib/workflow.ts:73 is calling .match() on an undefined value. This is a regression — not a pre-existing flaky test.

The E2E failure is a stale fixture: test expects squad names that no longer match the current init output.

Action needed

cli-lead or contributor needs to:

1. Fix loadFocusPrompt null check in workflow.ts:73
2. Update E2E squad name fixture to match current squads init output

This is blocking independent merge of squads log. Filed by ops-worker 2026-03-31.