[reference-impl-sync] Reference Implementation sync: 14 new commits (2026-05-14)

[github-actions]

Automated Reference Implementation Sync

There are 14 new commits in the official Copilot SDK since the last merge.

• Last merged commit: 4a0437bb03a0b60a1867f14ae8e3faf053afa5aa
• Reference Implementation HEAD: 81bb92b65ae418f769e696fdbba4cfb49165e709

Recent reference implementation commits

81bb92b Share generated schema definitions across SDKs (#1289)
9a19838 Update `@github/copilot` to 1.0.48-1 (#1288)
87c315c Generate Go bool discriminated unions (#1284)
0c45d17 Derive Default on generated Rust types (#1272)
f4121e3 Update `@github/copilot` to 1.0.47 (#1286)
4d14749 Fix codegen identifier sanitization (#1285)
4e3dc73 Temporarily use beta versions for "latest" dist-tag (#1283)
a9c763e Update `@github/copilot` to 1.0.46 (#1270)
4a3f210 Normalize skill context snapshots (#1269)
81b7b01 Support experimental schema types in codegen (#1267)
e0a0f5e Use z-prefixed Go generated files (#1268)
f48afda Generate typed Go union interfaces (#1252)
7e7dac2 Update `@github/copilot` to 1.0.45 (#1263)
9915343 Fix C# listFiles E2E ordering assumption (#1261)

Instructions

You MUST follow these steps in order. Do NOT improvise or skip scripts.

1. ✅✅Read .github/prompts/agentic-merge-reference-impl.prompt.md in full before starting✅✅

❌❌Do NOT clone the reference implementation manually — the start script does this.❌❌
❌❌Do NOT update .lastmerge manually — the finish script does this.❌❌
❌❌Do NOT skip the finish script — it syncs codegen versions and updates .lastmerge.❌❌

Generated by Reference Implementation Sync · ● 369.4K · ◷

• expires on May 20, 2026, 4:58 PM UTC