Unify @github/copilot version tracking and rename sync workflow

Option C: Make reference-impl sync the single entry point for all
@github/copilot version changes. During sync, both pom.xml and
scripts/codegen/package.json are updated from the reference
implementation's nodejs/package.json.

Changes:
- Add sync-codegen-version.sh to update scripts/codegen/package.json
- Update merge-reference-impl-finish.sh to call the new script
- Remove Dependabot npm entry for /scripts/codegen (no longer needed)
- Rename weekly-reference-impl-sync.{yml,md,lock.yml} to
  reference-impl-sync.{yml,md,lock.yml}
- Change schedule from weekly (Monday) to daily
- Remove all 'weekly'/'Weekly' timing references from file contents
- Rename POM property to remove 'weekly' from its name
- Recompile agentic workflow via gh aw compile

Author: edburns

.github/workflows/reference-impl-sync.yml

@@ -2,8 +2,8 @@ name: "Reference Implementation Sync"
 
 on:
   schedule:
-    # Daily at 10:00 UTC (5:00 AM EST / 6:00 AM EDT)
-    - cron: '0 10 * * *'
+    # Tuesday and Thursday at 10:00 UTC (5:00 AM EST / 6:00 AM EDT)
+    - cron: '0 10 * * 2,4'
   workflow_dispatch:
 
 permissions:

README.md

@@ -165,7 +165,7 @@ Contributions are welcome! Please see the [Contributing Guide](CONTRIBUTING.md)
 
 This SDK tracks the official [Copilot SDK](https://github.com/github/copilot-sdk) (.NET reference implementation) and ports changes to Java. The reference implementation merge process is automated with AI assistance:
 
-**Daily automated sync** — A [scheduled GitHub Actions workflow](.github/workflows/reference-impl-sync.yml) runs daily at 10:00 UTC. It checks for new reference implementation commits since the last merge (tracked in [`.lastmerge`](.lastmerge)), and if changes are found, creates an issue labeled `reference-impl-sync` and assigns it to the GitHub Copilot coding agent. Any previously open `reference-impl-sync` issues are automatically closed. The sync also updates the `@github/copilot` version in both `pom.xml` and `scripts/codegen/package.json` to keep schemas and test CLI in lockstep.
+**Automated sync** — A [scheduled GitHub Actions workflow](.github/workflows/reference-impl-sync.yml) runs on the schedule specified in that file. It checks for new reference implementation commits since the last merge (tracked in [`.lastmerge`](.lastmerge)), and if changes are found, creates an issue labeled `reference-impl-sync` and assigns it to the GitHub Copilot coding agent. Any previously open `reference-impl-sync` issues are automatically closed. The sync also updates the `@github/copilot` version in both `pom.xml` and `scripts/codegen/package.json` to keep schemas and test CLI in lockstep.
 
 **Reusable prompt** — The merge workflow is defined in [`agentic-merge-reference-impl.prompt.md`](.github/prompts/agentic-merge-reference-impl.prompt.md). It can be triggered manually from:
 - **VS Code Copilot Chat** — type `/agentic-merge-reference-impl`

docs/WORKFLOWS.md

@@ -9,8 +9,8 @@
 | [Update @github/copilot Dependency](workflows/update-copilot-dependency.yml) | Updates the `@github/copilot` npm package, re-runs code generation, and opens a PR | `workflow_dispatch` | — |
 | [Deploy Documentation](workflows/deploy-site.yml) | Generates and deploys versioned docs to GitHub Pages | `workflow_run` (after Build & Test), `release`, `workflow_dispatch` | — |
 | [Publish to Maven Central](workflows/publish-maven.yml) | Releases the SDK to Maven Central and creates a GitHub Release | `workflow_dispatch` | — |
-| [Reference Implementation Sync](workflows/reference-impl-sync.yml) | Checks for new reference implementation commits and creates an issue for Copilot to merge | `workflow_dispatch` | Daily at 10:00 UTC |
-| [Reference Implementation Sync (Agentic)](workflows/reference-impl-sync.lock.yml) | Compiled agentic workflow that executes the reference implementation sync via `gh-aw` | `workflow_dispatch` | Daily (scattered) |
+| [Reference Implementation Sync](workflows/reference-impl-sync.yml) | Checks for new reference implementation commits and creates an issue for Copilot to merge | `workflow_dispatch` | [See workflow](workflows/reference-impl-sync.yml) |
+| [Reference Implementation Sync (Agentic)](workflows/reference-impl-sync.lock.yml) | Compiled agentic workflow that executes the reference implementation sync via `gh-aw` | `workflow_dispatch` | [See workflow](workflows/reference-impl-sync.yml) |
 | [Copilot Setup Steps](workflows/copilot-setup-steps.yml) | Configures the environment for the GitHub Copilot coding agent | `push` (on self-change), `workflow_dispatch` | — |
 
 ---
@@ -68,7 +68,7 @@ Manual-only workflow that performs a full release:
 
 **File:** [`reference-impl-sync.yml`](workflows/reference-impl-sync.yml)
 
-Runs daily at 10:00 UTC. Clones the official `github/copilot-sdk` repository and compares `HEAD` against the commit hash stored in `.lastmerge`.
+Runs on the schedule specified in [`.github/workflows/reference-impl-sync.yml`](workflows/reference-impl-sync.yml). Clones the official `github/copilot-sdk` repository and compares `HEAD` against the commit hash stored in `.lastmerge`.
 
 If new commits are found:
 1. Closes any previously open `reference-impl-sync` issues