test: ship a plain script in the packed one-build fixture (#102 stage 4)

[ScriptedAlchemy]

Final #102 stage-4 PR: closes the last acceptance line as literally written — "One project ships custom commands, MCP-generated commands, plain scripts, and rendered scripts through one Agent Bundle build."

The packed cli-routes-build fixture (which after #275 already ships custom plain/rendered commands, projected MCP commands, and a rendered .tsx script) gains a plain src/scripts/checksum.ts. The packed journey now asserts the plain script ships at artifact/portable/scripts/checksum.mjs, executes under process.execPath with deterministic stdout, and has no sibling -flight.mjs worker — a plain script remains a normal executable with no renderer assumptions.

Tests only; no changeset.

Local gates

• pnpm build + packed integration cli-routes-build.test.ts — 1/0
• root pnpm lint — 0 errors, 0 warnings (939 files)

[changeset-bot]

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Latest commit: 6b6a661

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-02T04:52:24.146729Z	04fe75e	PR opened

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