fix(marketing): update OpenCode provider mark

[rynfar]

Pylon's marketing page still displayed OpenCode's older dark-tile mark. This replaces that one third-party asset with the updated transparent OpenCode mark from frozen T3 source 53456bc012 (#13365). The existing hero and provider-card references pick it up without layout or product-brand changes. Pylon's marketing page has no Antigravity mark, so the Antigravity half of that source is not applicable here.

Verification: the SVG parsed with xmllint, rendered to raster with sips, and remained legible at the page's 22px provider-card size; marketing Astro typecheck passed with 0 diagnostics; git diff --check passed. The SVG is excluded by the repository's formatter. The scoped lint command could not load the repo's JS lint plugin after a filtered install; no script or Astro source changed. Before/after asset rasters were inspected locally, but no browser screenshot was captured or uploaded. The T3 collaborative preview had failed on prior attempts, so this small asset change did not repeat the browser setup.

Related: #865. No Pylon identity or runtime identifiers changed.

Model: GPT-6 Sol (low), Pylon Codex harness.

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1 Skipped Deployment

Project	Deployment	Actions	Updated
pylon-marketing	Ignored		Sep 27, 2026 12:14pm 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	14.0 KiB	14.0 KiB	+3 B (+0.0%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.2 KiB	7.3 KiB	+9 B (+0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.7 KiB	6.7 KiB	−6 B (−0.1%)	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	10	9	−1 (−10.0%)	21	✅
Claude	Total thread wire	14.0 KiB	14.0 KiB	+28 B (+0.2%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.3 KiB	7.3 KiB	+3 B (+0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.8 KiB	6.8 KiB	+25 B (+0.4%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	58.9 KiB	58.9 KiB	+44 B (+0.1%)	66.4 KiB	✅
Claude	Live turn messages	9	10	+1 (+11.1%)	21	✅

Baseline: db1e948 · PR result: 95af149 · 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: 115.7 KiB
• Claude decoded thread snapshot: 116.4 KiB

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