Docs: CI runtime analysis (Gate py311)

[stranske]

Adds a short write-up under docs/ci/ capturing the current Gate/CI runtime measurements and why pytest dominates wall time, plus concrete options for reducing PR loop duration (scoping/sharding via pytest_args, coverage policy, profiling).

[agents-workflows-bot]

⚠️ Action Required: Unable to determine source issue for PR #131. The PR title, branch name, or body must contain the issue number (e.g. #123, branch: issue-123, or the hidden marker ).

[Copilot]

Pull request overview

Adds a dated CI performance note under docs/ci/ documenting current Gate/CI runtime measurements (py311) and outlining concrete options to reduce PR feedback loop time (scoping, sharding, coverage policy, profiling).

Changes:

• Document Gate vs CI runtime stats and identify pytest+coverage as the dominant wall-time cost.
• Summarize recent workflow-related changes (Workflows repo + Counter_Risk repo) that influence CI behavior.
• Propose next-step options for reducing PR loop duration (subset runs via pytest_args, sharding, coverage adjustments, and profiling).

[agents-workflows-bot]

🤖 Keepalive Loop Status

PR #131 | Agent: Codex | Iteration 0/5

Current State

Metric	Value
Iteration progress	[----------] 0/5
Action	wait (missing-agent-label)
Disposition	skipped (transient)
Gate	success
Tasks	0/0 complete
Timeout	45 min (default)
Timeout usage	11m elapsed (25%, 34m remaining)
Keepalive	❌ disabled
Autofix	❌ disabled

🔍 Failure Classification

| Error type | infrastructure |
| Error category | resource |
| Suggested recovery | Confirm the referenced resource exists (repo, PR, branch, workflow, or file). |