chore: use Node 24 LTS for binary builds + explicit tree shaking

[BYK]

Changes

• Bump fossilize NODE_VERSION from "22" to "lts" (resolves to Node 24 Krypton)
• Add explicit treeShaking: true to both build.ts and bundle.ts esbuild configs
• Update esbuild target from node22 to node24

Results (linux-x64 with code cache)

Metric	Node 22	Node 24 LTS	Change
JS bundle	3.9 MiB	3.7 MiB	-5%
Raw binary	127 MiB	125 MiB	-1.6%
Startup	~1.0s	~1.0s	on par
Completion	~0.18s	~0.15s	~17% faster

Note: Earlier measurements showed larger startup improvements but were affected by system load variance. Controlled re-measurement shows startup is comparable, with completions genuinely faster.

Note: engines.node in package.json stays at >=22.15 — that's the minimum for the npm package (npx sentry). The binary embeds its own Node 24 runtime.

[sentry-warden]

Library bundle targets node24 but package engines allows Node 22

Setting target: "node24" in the npm library bundle (dist/index.cjs) tells esbuild to skip downleveling any syntax that Node 24 supports natively; if any such syntax is used in source or dependencies, it will be emitted verbatim and break consumers running Node 22 (permitted by engines.node >= 22.15).

Evidence

• bundle.ts line 197 changes target from "node22" to "node24" for the output dist/index.cjs, which is the npm library entry point.
• package.json engines.node remains ">=22.15", explicitly allowing Node 22 consumers of the npm package.
• esbuild's target determines which syntax transformations are skipped; a node24-only syntax feature in source or a bundled dep will pass through untransformed.
• The binary build (build.ts) also uses node24 but embeds its own Node 24 runtime (via fossilize), so that path is safe — the library bundle path is not.
• The PR description acknowledges the binary embeds Node 24, but does not address this library-bundle target mismatch.

Suggested fix: Keep the library bundle target aligned with the minimum supported engine version so esbuild correctly downlevels any syntax gaps.

Suggested change

	target: "node24",
	target: "node22",

_{Identified by Warden find-bugs · 89U-MM4}

[github-actions]

Codecov Results 📊

✅ Patch coverage is 100.00%. Project has 4286 uncovered lines.

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