feat(aircoding): AirCoding V2 baseline — deterministic multi-agent architecture

Forked from OpenCode v1.17.4 with multi-agent system:
- 5 agents: aircoding, scheduler, worker, architect, reviewer
- Deterministic DAG scheduling engine (coordinator_tick)
- Tool whitelists as hard enforcement
- AirCoding validation plugin
- V1 requirements: C4 docs, ADR, AGENTS.md, debug-log.md
- Design documents in docs/

packages/ui/src/components/markdown-stream.ts

@@ -0,0 +1,49 @@
+import { marked, type Tokens } from "marked"
+import remend from "remend"
+
+export type Block = {
+  raw: string
+  src: string
+  mode: "full" | "live"
+}
+
+function refs(text: string) {
+  return /^\[[^\]]+\]:\s+\S+/m.test(text) || /^\[\^[^\]]+\]:\s+/m.test(text)
+}
+
+function open(raw: string) {
+  const match = raw.match(/^[ \t]{0,3}(`{3,}|~{3,})/)
+  if (!match) return false
+  const mark = match[1]
+  if (!mark) return false
+  const char = mark[0]
+  const size = mark.length
+  const last = raw.trimEnd().split("\n").at(-1)?.trim() ?? ""
+  return !new RegExp(`^[\\t ]{0,3}${char}{${size},}[\\t ]*$`).test(last)
+}
+
+function heal(text: string) {
+  return remend(text, { linkMode: "text-only" })
+}
+
+export function stream(text: string, live: boolean) {
+  if (!live) return [{ raw: text, src: text, mode: "full" }] satisfies Block[]
+  const src = heal(text)
+  if (refs(text)) return [{ raw: text, src, mode: "live" }] satisfies Block[]
+  const tokens = marked.lexer(text)
+  const tail = tokens.findLastIndex((token) => token.type !== "space")
+  if (tail < 0) return [{ raw: text, src, mode: "live" }] satisfies Block[]
+  const last = tokens[tail]
+  if (!last || last.type !== "code") return [{ raw: text, src, mode: "live" }] satisfies Block[]
+  const code = last as Tokens.Code
+  if (!open(code.raw)) return [{ raw: text, src, mode: "live" }] satisfies Block[]
+  const head = tokens
+    .slice(0, tail)
+    .map((token) => token.raw)
+    .join("")
+  if (!head) return [{ raw: code.raw, src: code.raw, mode: "live" }] satisfies Block[]
+  return [
+    { raw: head, src: heal(head), mode: "live" },
+    { raw: code.raw, src: code.raw, mode: "live" },
+  ] satisfies Block[]
+}