Fix stale codegen references in copilot-instructions.md

[rinceyuan]

.github/copilot-instructions.md points contributors and coding agents at a type-generation entry point that was removed in February. Four references are stale.

Line	Says	Reality
16	nodejs/scripts/generate-session-types.ts	File does not exist
26	npm run generate:session-types	Script does not exist
71	scripts/codegen/java.ts	Real path is java/scripts/codegen/java.ts
72	npm run generate:session-types	Script does not exist

#464 (RPC codegen, 2026-02-13) deleted the script and replaced the npm task in the same commit:

$ git show 7e069fd6 -- nodejs/package.json
-    "generate:session-types": "tsx scripts/generate-session-types.ts",
+    "generate": "cd ../scripts/codegen && npm run generate",

$ git log --diff-filter=D --oneline -1 -- nodejs/scripts/generate-session-types.ts
7e069fd6 RPC codegen (#464)

The document already had the correct command elsewhere, so it contradicted itself — line 67 says cd nodejs && npm run generate while lines 26 and 72 named the deleted task. This aligns them.

Verification

generate:session-types survived nowhere but this file, and nothing references it after the change:

$ git grep -rn -E 'generate:session-types|nodejs/scripts/generate-session-types'
                      # (no output)

Every path the file now claims resolves:

$ ls -d scripts/codegen java/scripts/codegen/java.ts java/sdk/src/generated/java nodejs/src/generated
scripts/codegen  java/scripts/codegen/java.ts  java/sdk/src/generated/java  nodejs/src/generated

scripts/codegen is confirmed as the producer of the Node output that line 72 describes:

$ grep -n 'nodejs/src/generated' scripts/codegen/typescript.ts
602:    const outPath = await writeGeneratedFile("nodejs/src/generated/session-events.ts", annotatedTs);
960:    const outPath = await writeGeneratedFile("nodejs/src/generated/rpc.ts", rpcTs);

Scope

Only the four stale references. The Maven command on line 71 is left as-is — the codegen profile is real (java/sdk/pom.xml, whose own comment documents mvn generate-sources -Pcodegen), and its workingDirectory is ${project.parent.basedir}/scripts/codegen, which confirms java/scripts/codegen as the correct generator location.

[Copilot]

🟢 Approval recommended

All updated references match the repository’s current codegen paths and scripts.

Pull request overview

Updates contributor instructions to reference the current centralized code-generation workflow.

Changes:

• Replaces deleted Node.js generator references with npm run generate.
• Corrects the Java generator path.

File summaries

File	Description
.github/copilot-instructions.md	Corrects stale codegen paths and commands.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Balanced

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[SteveSandersonMS]

Verified: the four stale references to nodejs/scripts/generate-session-types.ts / npm run generate:session-types and the Java codegen path are correctly fixed. I independently confirmed the old script/task no longer exist, npm run generate correctly delegates to scripts/codegen, and java/scripts/codegen/java.ts is the real path. Repo-wide grep shows no remaining references to the deleted script/task. Scope is precisely the 4 lines described. LGTM.