refactor: migrate process backend from execa to tinyexec

[davigiroux]

Closes #34.

Wraps tinyexec in a small tagged-template adapter so the existing ($) => $\...`and$({ env })`...`callable form keep working. Instance files (anvil/alto/tempo) and theprool.processes.execa` namespace are unchanged. (Path 2 from the issue thread.)

• Adapter splits static segments on whitespace and spreads array interpolations into argv. Relies on toArgs returning unquoted string[], which it already does.
• env option merges into process.env.
• Two new tests pin the array-spread contract and env merging. The five original process tests pass unchanged.
• About 16 fewer transitive deps. No new deps added.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	tinyexec@​1.1.2

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