chore: merge upstream/dev into the fork - #78

Summary

Syncs the fork's dev with upstream anomalyco/opencode dev up to 609ee05a23 (2 upstream commits since #77):

• feat(core): report subagent results to the parent every time a child goes idle anomalyco/opencode#63209: the parent now gets a subagent report every time a child goes idle, and the subagent tool gains a notify flag.
• chore: remove beta what's new and visual svgs anomalyco/opencode#63325: removes the beta "What's new" dialog and the visual SVGs.

Conflicts resolved

The subagent rework overlapped two fork features.

Background work still running (AGENTS.md: "a subagent reported as done must say what it left running")

• Upstream now covers this with its own SubagentCompletion.formatBody and SessionBackground.outstanding, which append Background work still running: to completed, failed and cancelled answers.
• The fork's leftRunning / withLeftRunning are dropped in favour of upstream's.
• The fork's tool-subagent test for it now asserts upstream's format.

Declared output fields

• SubagentCompletion.declared and its use in deliver are kept.
• declared now splits the answer from upstream's Background work still running: block, so only the subagent's answer is parsed against the fields.
• deliver keeps upstream's generic SyntheticSession<E> signature and its cancelled body.

Subagent tool

• The fork keeps its prepare / authorize / launch split.
• Upstream's changes are ported into launch:
  • the notify input and child metadata (SubagentMetadata.withNotify / update);
  • admission without a wake unless the child is already running;
  • subagents.start(recovery, { background });
  • backgroundResult(id, notify);
  • failure and cancel messages that list outstanding work.
• The fork's output input field is kept next to upstream's notify.

Tests

• tool-subagent.test.ts takes upstream's completionLLM layer setup, with SubagentJob.node added back to the completion graph for the fork's test.
• subagent-output.test.ts builds its note with formatBody.

Follow-up worth considering: one line of the fork's AGENTS.md says detached work answers only to the subagent's own Session. With anomalyco#63209 the child also reports to the parent when it goes idle, so that line should be updated.

Verification

• core typecheck:tsc is clean.
• Subagent tests pass, 65/65: tool-subagent, subagent-output, subagent-completion, subagent-report, subagent-idle-e2e.
• bun run lint passes and check:generated in client and protocol is clean.
• bun.lock / package.json differ from upstream only by the fork entries.
• The full core suite is still running locally; results will follow in a comment.

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