docs: refresh weekly fork retirement evidence (2026-09-12)

[joeshull]

Downstream feature: true
Downstream rationale: docs/fork-retirement.md is the fork-only capability-parity ledger; the path is not on the governance allowlist and the document has no upstream counterpart.

What changed

Evidence refresh only — no capability status changed. All four capabilities remain waiting.

• Baseline: fork integration 2470e3ef6 (merge of fix(app): isolate markdown parser rebuild after a failed install #115), mirror fa93c4290, upstream d1b705a0c; documents the review-period merges (fix(app): isolate markdown parser rebuild after a failed install #115, fix(app): host native MarkdownSource in View #116, docs: replace host LaTeX with the plugin markdown surface #117, fix(nix): refresh npm deps hash for markdown plugin lockfile changes #112, docs(development): record the systemd-unit failure mode for local daemon upgrades #113) and the open mergeable sync PR Sync upstream main into internal/main #114.
• Capability 1 (plugin assistant-markdown surface): adds merged evidence fix(app): isolate markdown parser rebuild after a failed install #115 (rebuild-throw isolation, merge 2470e3ef6) and fix(app): host native MarkdownSource in View #116 (native MarkdownSource hosted in a View, merge 63af4a9d0); the checklist gains the rebuild-throw behavior and the native View hosting behavior (view-backed children such as SvgXml must not nest under Text). Replaces the stale "fix(app): isolate markdown parser rebuild after a failed install #115 open follow-up" note.
• Capability 2 (OMP lifecycle): re-verified at upstream d1b705a0c — completeTurnAfterProviderIdle still polls provider state alone with no elapsed/failure budget and no child awareness.
• Capability 3 (Ask option descriptions): upstream evidence corrected — fix(omp): preserve described select options getpaseo/paseo#3628 moved to head f8e7b93d (updated 2026-09-11), so the earlier "unchanged since 2026-08-27" note no longer holds; its diff still carries readSelectOptions(options, optionDetails) with malformed/blank/extra fallback tests. Upstream main still has zero optionDetails matches.
• Capability 4 (Claude background/autonomous lifecycle): upstream evidence refreshed — claude: spare background subagents from an interrupt, and let one be stopped getpaseo/paseo#4594 moved to head 1549ea56; it spares background children from interrupts and adds a stop control, but leaves settlement to the child's own terminal status and does not touch agent-prompt.ts/agent-run-state.ts. Upstream main re-verified at d1b705a0c: no hasBlockingRun, no acceptsPromptDuringAutonomousTurn, no hasRunningTasks; appendTaskNotificationEvents never settles a leftover autonomous turn.

Verification

• git log fa93c4290..upstream/main --name-only — the six new upstream commits (fix(app): restore Android clipboard image pasting getpaseo/paseo#4758, Keep rejected plans collapsed in conversation order getpaseo/paseo#4756, Keep older daemons usable and let clients choose timeline recovery getpaseo/paseo#4737, fix(server): show the right thinking options for each Cursor model getpaseo/paseo#4180, fix(app): keep incomplete Markdown formatted while streaming getpaseo/paseo#4742, fix(agents): restore archived Codex workspaces without losing focus getpaseo/paseo#4736) touch none of the four capability surfaces.
• git grep over upstream/main: zero matches for SvgXml (plugin client), addMarkdownExtension, MarkdownSource, optionDetails, hasBlockingRun, acceptsPromptDuringAutonomousTurn, and the bounded-idle markers (MAX_PROVIDER_IDLE, idleDeadline, childActivity).
• Body inspection of upstream main completeTurnAfterProviderIdle (omp/agent.ts:2156) and appendTaskNotificationEvents (claude/agent.ts:4301).
• git diff upstream/main origin/internal/main on agent-prompt.ts / agent-run-state.ts / agent-sdk-types.ts / subagents/live-source.ts — the fork's capability-4 residue is the 20-line admission/settlement delta described in the ledger.
• Upstream PR states read live: feat(app): provide SvgXml to plugins getpaseo/paseo#4749/feat(app): let plugins extend assistant markdown rendering getpaseo/paseo#4750/feat(app): provide MarkdownSource to plugins getpaseo/paseo#4752 open (heads 1a1144648, 15efaa1b2, bfc1e0ecd); fix(omp): preserve described select options getpaseo/paseo#3628 open head f8e7b93d; claude: spare background subagents from an interrupt, and let one be stopped getpaseo/paseo#4594 open head 1549ea56; fix(server): forward steerActiveTurn through wrapSessionProvider getpaseo/paseo#4633 open head 1132cdb0e; fix(omp): keep parent non-idle while internal task subagents run getpaseo/paseo#3371/fix(server): keep background subagents alive when prompting a busy agent getpaseo/paseo#3366 closed unmerged; feat(app): render LaTeX formulas in assistant messages getpaseo/paseo#2562 closed unmerged.
• Docs-only change: npm run format:files -- docs/fork-retirement.md (oxfmt) passes; no runtime code touched.

Weekly resolver report

• Active waiting capability count: 4 (unchanged); 0 upstream-candidate, 0 retired. Retired history: host LaTeX remains superseded (not restored).
• Status changes: none — all four remain waiting; evidence refreshed for all four.
• Upstream replacements adopted: none — upstream main @ d1b705a0c provides none of the four capabilities' required behaviors.
• Fork implementations removed: none.
• Sync PRs found/resolved/skipped: found open sync PR Sync upstream main into internal/main #114 (main → internal/main), GitHub reports MERGEABLE — not dirty, so per contract no resolver was created and Sync upstream main into internal/main #114 is left to the scheduled Upstream import merge workflow. No active Downstream sync: true resolver exists; none needed.
• Upstream head movements recorded this run: fix(omp): preserve described select options getpaseo/paseo#3628 → f8e7b93d (still carries the optionDetails candidate), claude: spare background subagents from an interrupt, and let one be stopped getpaseo/paseo#4594 → 1549ea56 (interrupt-sparing + stop control; no leftover-turn settlement, no admission-gate change), feat(app): provide SvgXml to plugins getpaseo/paseo#4749/feat(app): let plugins extend assistant markdown rendering getpaseo/paseo#4750/feat(app): provide MarkdownSource to plugins getpaseo/paseo#4752 still open and unmerged.
• PRs created this run: this ledger PR only.
• Focused verification: upstream-main body inspections and fork-vs-upstream diffs listed above; oxfmt format check passed; no local test suites run (docs-only change; typecheck/lint unaffected and covered by CI).
• CI: green — format and changes pass, all code jobs skip via path filter, Upstream provenance reconcile passes on head 367c8b78d; ship-gate agent review posted CLEAN with zero findings; merged as merge commit c9f842ff6f5c77cce046df4dd2702113368734aa. Review: #issuecomment-5645817930
• Blockers: none.

[joeshull]

Ship-gate review (agent)

• Reviewed head: 367c8b78d9eb4ef56d9e9415d891373e4c37cb96 (docs/fork-retirement-refresh-2026-09-12 → internal/main)
• Verdict: CLEAN (confidence 0.99)
• Governance: exact Downstream feature: true marker + one non-empty Downstream rationale: line; changes only docs/fork-retirement.md outside the governance allowlist; no workflow files; no downstream-sync marker or merge topology.
• Ledger contract: exactly four waiting capabilities; superseded host LaTeX in retired history; excluded operations retained; review dates/baselines coherent.
• Evidence spot-checks: fork merge SHAs 099f9f8b2, fe9c6897e, b43b48410, 2470e3ef6, 63af4a9d0 all resolve exactly.
• High-risk findings: none. Advisory findings: none.

CI + Upstream provenance green on this head.