Handle multiple scripts when deciding whether to hydrate blocks

[elemdos]

An empty <script module></script> before an interactive instance script made primo build skip the client bundle, leaving controls inert. The hydration check now inspects every script and bundles the block when any script has content.

Adds a regression fixture that verifies the counter bundle and hydration import. The startup test also selects an isolated port so an existing server on port 3000 cannot affect its result.

Validation: the full suite with companion PRs #57 and #58 passes on Node 22: 132 passed, two skipped. The same suite passes against the prepared primo-mcp 0.1.10 package. Completes the hydration correction for #58.

Summary by CodeRabbit

• Bug Fixes
  • Builds now correctly generate the client-side bundle when a component has an empty module script followed by an interactive script. The resulting page can load its interactive features as expected.
  • Improved build coverage verifies that generated pages include the required client-side code.

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Reviewing files that changed from the base of the PR and between f2332e3 and 7fee90a.

📒 Files selected for processing (3)

• src/commands/build.ts
• tests/build-hydration-scripts.test.mjs
• tests/site-ids.test.mjs

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