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/app/src/components/session/session-context-format.ts

@@ -0,0 +1,20 @@
+import { DateTime } from "luxon"
+
+export function createSessionContextFormatter(locale: string) {
+  return {
+    number(value: number | null | undefined) {
+      if (value === undefined) return "—"
+      if (value === null) return "—"
+      return value.toLocaleString(locale)
+    },
+    percent(value: number | null | undefined) {
+      if (value === undefined) return "—"
+      if (value === null) return "—"
+      return value.toLocaleString(locale) + "%"
+    },
+    time(value: number | undefined) {
+      if (!value) return "—"
+      return DateTime.fromMillis(value).setLocale(locale).toLocaleString(DateTime.DATETIME_MED)
+    },
+  }
+}