feat(review): make PR comments easier to scan and submit

[rynfar]

Pull request conversations become difficult to scan when long bot reports and finished review threads dominate the page. This adopts five related upstream improvements: compact narrow-panel controls, Command/Control+Enter comment submission, grouped and paged comments with long-body previews, author avatars in detail views, and reliable avatar failure fallback.

Independent Opus review caught two issues before landing: bot authors now consistently link to GitHub app profiles, and resolved/dismissed groups mount lazily and page ten comments at a time. Collapse scrolling now runs after the preview height is applied. Pylon branding, projected multi-PR authority, remote environment identity, provider adapters and mobile wire compatibility are preserved. No migration, release or installation.

Upstream credit (original authors and cherry-pick provenance preserved):

• Bilal Bakr — f0a0ead946ca3f3f310460a91b7dabb0e3fe4834 (#11962), narrow controls.
• oliver / flamboh — f45c6b4a755905485431872f4a4188de3ed05974 (#11994), comment shortcut.
• maria — c12ba7581ac00ba2a623ad23283da5d03d34c2d8 (#12150), scannable comments and bot metadata.
• Exotic / extoci — 962bf62921c0ecbc9320f9b071e16b1d41484aad (#12125), detail avatars.
• Harshith Goka — df466c79810046d20c0f3ccc4e51709c5703814e (#11728), avatar fallback.

Validation:

• Focused server/contract and web regressions, including modifier/IME/repeat/pending/draft shortcuts, avatar error and URL recovery, bot profile links, and 150 resolved comments with lazy paging and PR switching.
• Scoped contracts, client-runtime, server, web and mobile typechecks; changed-file lint.
• Independent Claude Opus 5 adversarial server and UI reviews; UI corrections re-reviewed. Final product re-review at 94578d91ec passed 121 focused tests across five files; the unchanged server/contract review passed 219 tests across four files. Before/after screenshots, narrow-panel proof, and interaction recording are attached. Final-head CI passed at 6bf51fa18f72a9b2848430fac6039fca4c443d75: Check, Test, all three server shards, Rust, Release Smoke, background platform, and Linux/Windows packaged desktop smoke.

Known limits: GitHub bot enrichment uses the existing bounded GraphQL activity fetch; on fallback or beyond its metadata window an unsuffixed bot can remain unmarked. Other providers retain their existing actor metadata. Shared web/Electron UI changed; native mobile UI unchanged. Comment submission verified with mocked commands, without posting test comments to real PRs.

Closes #617. Five sources are fully adopted; frozen upstream head and review cursor stay unchanged. Remaining inventory goes from 143 to 138 upon merge.

Implemented with Codex (GPT-6-Astra); independently reviewed through Pylon delegation with Claude Agent / Claude Opus 5 after Antigravity quota blocked that provider.

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Project	Deployment	Actions	Updated
pylon-marketing	Ready	Preview	Sep 18, 2026 3:47am UTC

[rynfar]

Browser verification on product head 94578d9 (final head adds only the upstream decision record). Read-only real PR #616 in isolated Pylon state: before/after comment overview, before/after code controls, a 1100px viewport showing readable narrow controls, grouped bot reports with app-profile links, and a 23-second recording of expanding, scrolling and collapsing a long report. The comment remains in view after collapse. Submission, IME/pending safeguards, avatar failure/recovery and 150 resolved-comment paging are covered by focused tests; no test comments were posted to the inspected PR.

Attachments in that order:

comment-interaction.mp4

[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	+86 B (+0.6%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.2 KiB	7.2 KiB	+4 B (+0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.7 KiB	6.8 KiB	+82 B (+1.2%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	58.0 KiB	58.0 KiB	+88 B (+0.1%)	66.4 KiB	✅
Codex	Live turn messages	8	10	+2 (+25.0%)	21	✅
Claude	Total thread wire	14.0 KiB	14.0 KiB	−13 B (−0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.2 KiB	7.2 KiB	−3 B (−0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.7 KiB	6.7 KiB	−10 B (−0.1%)	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	9	9	0 (0.0%)	21	✅

Baseline: 3a0d8e4 · PR result: 6bf51fa · 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.