chore: pin opencode v1.18.10-amicode.22

[aarontrowbridge]

What

Lock bump: vendored fork binary v1.18.10-amicode.18 → v1.18.10-amicode.22 (ref 8c91b45fa8), all three platform assets sha256-verified by opencode:pin.

What's in the binary (fork amico/yellow-chunks-on-21)

• Rebased on amicode.21 (harmonic dot thinker rail, reconfigurable titlebar, sessions fixes) — supersedes the stale d3770776 base.
• User prompt bubble is the brand yellow chip in both schemes — --accent fill + --accent-ink, ink border on light, borderless solid yellow on dark (new --prompt-bubble-edge token; sticky bubble included).
• Prose fragments split at section boundaries — upstream's heading-anchored segmentation (BUG: Chat homepage recommended buttons are not useful / not tailored to the user #269) with the 1500-char paragraph fallback, replacing per-paragraph cards.
• Question answers render as the same yellow chip, right-aligned in the Questions card.
• YOU label dropped from the sticky prompt bubble.
• Bubble hand-offs merge via a 240ms WAAPI pass — the chip persists; no remount strobe under smooth scrolling (keyed-remount approach tried and reverted).

Verification

• 151/151 session-ui tests, tsgo -b clean, session-ui oxlint 0 errors
• Fork release workflow green on the tag; assets verified by pin
• Live-verified in the dev host on darwin-arm64 (light + dark)

[coderabbitai]

Important

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Run ID: 4e863ee3-a4d0-4b43-b3c4-7e4c98291bca

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[aarontrowbridge]

Closing as superseded: the vendored pin now flips to stock canonical opencode v1.18.29 via the origin-flip slice (amicode#823 → PR #840, director-gated: 18/18 new tests + typecheck clean + CI 10/10) — not to the fork's v1.18.10-amicode.22 lineage this PR pins. The operational .22 upgrade landed on the hub mid-session 2026-09-05 (session/device-lifecycle ledger §7); the retirement-cutover path owns the shipped pin from here. (Batch-go disposition, 2026-09-06.)