docs: update OpenClaw integration guide, blog, and ecosystem for plugin v0.7.3

[amavashev]

Summary

Updates all documentation to match the cycles-openclaw-budget-guard v0.7.3 release, including fixes discovered during live testing with OpenClaw.

Integration guide (how-to/integrating-cycles-with-openclaw.md)

• Hook table: Updated for reserve-then-commit model pattern and model blocking workaround
• v0.5.0 sections: Model cost reconciliation, MetricsEmitter, aggressive cache invalidation
• v0.6.0 sections: Retry/heartbeat, burn rate/exhaustion forecast, session event log
• Cost model explainer: USD_MICROCENTS conversion table, budget math, toolBaseCosts guidance
• Fail-open caveat: Surfaced near top of document
• Consistent naming: All metadata keys and log prefixes use openclaw-budget-guard
• Removed env var fallbacks: Plugin no longer reads process.env — docs show OpenClaw interpolation syntax
• Softened claims: "Abrupt failure" not "Graceless", no absolute "zero code changes"
• npm badges: Version + downloads badges added after title

Blog post (blog/openclaw-budget-guard-stop-agents-burning-money.md)

• Updated hook table for v0.6.0+ behavior (heartbeat, burn rate, event log, model blocking)
• Added burn rate detection and exhaustion forecast to runaway spend section
• Added MetricsEmitter and event log to visibility section
• Added continuous protection capabilities (anomaly detection, retry, heartbeat)
• Softened "zero code changes" language
• Consistent "Abrupt failure" phrasing

Ecosystem page (how-to/ecosystem.md)

• Added npm downloads badge to OpenClaw section (matching all other SDK entries)
• Added direct npm package link

Test plan

• All config property names match types.ts
• All default values match config.ts
• Version in log examples correct
• No "commits immediately" for models
• No "Graceless failure"
• No "zero code changes"
• Fail-open caveat present
• All model names use versioned format
• npm badge URLs use correct package name

https://claude.ai/code/session_016JXYAGrQ9bFio4BQpVP9V4