Improve OpenAI session reliability and pin OpenClaw 2026.2.22

[Vardominator]

Summary

• add oco session heal-openai for detecting and optionally removing sessions stuck in OpenAI reasoning-chain 400 loops
• implement session scan/repair logic in src/sessions.ts
• add unit tests for loop error detection/counting in tests/sessions.test.ts
• document recovery workflow in README.md
• pin inventory images from ghcr.io/openclaw/openclaw:latest to ghcr.io/openclaw/openclaw:2026.2.22 for deterministic deploys

Why

• prevents repeated stuck-session failures on OpenAI reasoning models
• removes ambiguity from latest image resolution during upgrades

Open-Source Safety

• no org-specific identifiers/secrets were added to tracked files
• only generic templates/examples and CLI logic are included

Validation

• bun test tests/sessions.test.ts (pass)
• instance upgrade verification and smoke tests were run locally across active agents before opening this PR