test: add executable qtest showcase corpus

[tiye]

Summary

• add RFC 0108 for the executable qtest showcase corpus
• add qtest fixtures covering map spread/destructuring, Unicode indexing, comprehensions, and loop control
• assert the directory runner executes every showcase fixture

Validation

• cargo run --locked --quiet --bin qtest -- tests/scripts
• make check
• git diff --check

This PR is stacked on PR #49 and should remain unmerged with the existing chain.

[Copilot]

Pull request overview

Adds an executable “showcase corpus” for qtest to serve as both regression coverage and minimal runnable documentation, and wires CI-facing tests/docs to treat these scripts as the canonical directory-run fixtures.

Changes:

• Added new tests/scripts/*.qc fixtures covering map spread/destructuring, Unicode indexing, filtered comprehensions, and loop control.
• Extended tests/cli_tools.rs to assert that directory-mode qtest tests/scripts executes all showcase fixtures.
• Added RFC 0108 documenting the corpus contract and updated scope/docs to reference RFC 0108 as the latest.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/scripts/control-flow.qc	Adds a loop-control (break/continue) showcase fixture.
tests/scripts/comprehension.qc	Adds a filtered comprehension showcase fixture asserting stable order.
tests/scripts/collections.qc	Adds a collections fixture for map spread/destructuring and Unicode indexing.
tests/cli_tools.rs	Adds a directory-run assertion ensuring all showcase fixtures are executed.
RFCs/0108-qtest-showcase-corpus.md	Documents the tests/scripts showcase corpus requirements and CI acceptance rule.
RFCs/0000-project-scope.md	Updates the “latest RFC” reference to include RFC 0108.
README.md	Updates the README’s RFC range reference to end at RFC 0108.

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