feat(usage): show OpenCode Go, Cursor, and Grok limits

[rynfar]

OpenCode Go, Cursor, and Grok accounts previously showed no subscription quota in Pylon even when their local provider instance was connected. This adds provider-specific, bounded quota probes from the instance's own authenticated environment and reports unavailable readings without exposing response bodies or credentials.

The probes run only for installed, authenticated local instances. OpenCode external servers, Cursor API-key mode, and Grok API-key/custom endpoint modes remain excluded. The usage docs describe the new readings.

Validation: 78 focused provider tests passed; server typecheck, changed-file lint, and formatting passed after merging current pylon. An adversarial source review found two Grok follow-up fixes and both are included with regression coverage. No live provider account was queried. A failed probe reports unavailable rather than retaining an old quota value; the existing unavailable warning handles that state.

Upstream sources: eff44be433dc9683da7764a20334598e47b127b2 (initial probes), 0cab7d5ab9 (empty Grok usage), and 91e53e501c (Grok account email), adapted to Pylon provider status and usage snapshot helpers.

Implemented with GPT-6 Sol in the Codex harness.

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1 Skipped Deployment

Project	Deployment	Actions	Updated
pylon-marketing	Ignored	Preview	Sep 26, 2026 6:45am UTC

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.9 KiB	14.0 KiB	+53 B (+0.4%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.2 KiB	7.2 KiB	+8 B (+0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.7 KiB	6.8 KiB	+45 B (+0.7%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	58.0 KiB	58.0 KiB	+44 B (+0.1%)	66.4 KiB	✅
Codex	Live turn messages	9	10	+1 (+11.1%)	21	✅
Claude	Total thread wire	14.0 KiB	14.0 KiB	+25 B (+0.2%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.2 KiB	7.2 KiB	+5 B (+0.1%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.8 KiB	6.8 KiB	+20 B (+0.3%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	58.9 KiB	58.9 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	10	10	0 (0.0%)	21	✅

Baseline: afd6c11 · PR result: a435270 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 115.6 KiB
• Claude decoded thread snapshot: 116.3 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.