Greptile Summary

This PR fixes a ~2x memory regression introduced in 3.12 by consolidating all plugin-sdk entries into a single tsdown build pass, enabling Rollup's chunk-sharing mechanism. Previously, each of the 44 entries was built independently, causing massive duplication of shared modules (e.g. 20 copies of query-expansion). The fix is a minimal, targeted change: replacing a .map() over pluginSdkEntrypoints that produced 44 separate configs with a single config whose entry is an Object.fromEntries map. The output paths (dist/plugin-sdk/<name>.js) are preserved exactly. Empirical measurements in the PR description confirm the optimization is working (89% reduction in plugin-sdk/ size, 95% reduction in heap cost).

Key changes:

• tsdown.config.ts: Replaces 44 individual nodeBuildConfig calls for plugin-sdk entries with one multi-entry config, allowing the bundler to deduplicate shared chunks.

Minor observation:

• The PR description refers to "38 plugin-sdk entries" and the test plan to "25 plugin-sdk entry points", but the pluginSdkEntrypoints array contains 44 entries. This is a documentation inaccuracy and does not affect build correctness.

Unchecked test-plan items:

• "Verify gateway starts and runs normally" and "Verify plugins load correctly at runtime" are still open — worth completing before merging to production.

Confidence Score: 4/5

• Safe to merge pending runtime verification (gateway start and plugin loading)
• The code change is mechanically correct and well-supported by empirical build metrics. The transformation from 44 separate configs to one multi-entry config preserves output paths and is a standard Rollup pattern. Unit and fast tests pass. The main remaining uncertainty is the two unchecked test-plan items: runtime gateway startup and plugin-loading validation, which could surface issues that build-time and unit tests don't cover.
• No files require special attention — the change is confined to a single config line in tsdown.config.ts.

_{Last reviewed commit: f62ec20}

Landed via temp rebase onto main.

• Gate: pnpm test src/plugin-sdk/index.test.ts passed. Full repo gate was blocked by pre-existing base-branch failures (pnpm check hit an existing conflict marker in src/daemon/schtasks.startup-fallback.test.ts; PR CI was already red on that plus unrelated undici audit + OOM in a full test shard).
• Land commit: 98acb17
• Merge commit: b7ff825

Thanks @TarasShyn!