feat: select qtest files

[tiye]

Summary

• define RFC 0115 for deterministic qtest filtering and file enumeration
• add qtest --filter TEXT and non-executing qtest --list
• preserve default full-corpus behavior, ordering, deduplication, fuel, JSON, and TAP contracts
• document the workflow in the syntax index and all five executable manuals

Validation

• make docs
• make check
• qtest --list --filter stdlib tests/scripts

This PR is stacked on PR #57 and is intentionally not merged independently.

[Copilot]

Pull request overview

Adds deterministic qtest corpus selection and enumeration via --filter and --list, codified in RFC 0115 and documented across the syntax index and executable manuals, while aiming to preserve existing qtest output/fuel/JSON/TAP behavior by default.

Changes:

• Implement qtest --filter TEXT (path substring filtering) and qtest --list (non-executing enumeration).
• Extend CLI integration tests to cover filtering, listing, no-match, and flag conflicts.
• Add RFC 0115 and propagate documentation updates across README, syntax index, and all five manuals (source + rendered docs).

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/cli_tools.rs	Adds CLI-level coverage for qtest --filter / qtest --list and related error cases.
src/bin/qtest.rs	Implements new CLI flags, selection logic, and listing mode for qtest.
RFCs/0115-qtest-selection.md	Defines the RFC contract for deterministic qtest filtering and enumeration.
RFCs/0000-project-scope.md	Updates project RFC coverage range to include RFC 0115.
README.md	Updates README to reference RFC 0115 as the latest governing RFC.
manuals/manual.zh-CN.qc	Documents qtest --filter / qtest --list in the executable manual source.
manuals/manual.latin.qc	Documents qtest --filter / qtest --list in the executable manual source.
manuals/manual.en.qc	Documents qtest --filter / qtest --list in the executable manual source.
manuals/manual.devanagari-sa.qc	Documents qtest --filter / qtest --list in the executable manual source.
manuals/manual.classical-zh.qc	Documents qtest --filter / qtest --list in the executable manual source.
docs/syntax.zh-CN.md	Updates syntax index to mention the new qtest selection/listing workflow.
docs/syntax.en.md	Updates syntax index to mention the new qtest selection/listing workflow.
docs/manual.zh-CN.md	Regenerates Markdown manual content reflecting new qtest flags.
docs/manual.zh-CN.html	Regenerates HTML manual content reflecting new qtest flags.
docs/manual.latin.md	Regenerates Markdown manual content reflecting new qtest flags.
docs/manual.latin.html	Regenerates HTML manual content reflecting new qtest flags.
docs/manual.en.md	Regenerates Markdown manual content reflecting new qtest flags.
docs/manual.en.html	Regenerates HTML manual content reflecting new qtest flags.
docs/manual.devanagari.sa.md	Regenerates Markdown manual content reflecting new qtest flags.
docs/manual.devanagari-sa.html	Regenerates HTML manual content reflecting new qtest flags.
docs/manual.classical-zh.md	Regenerates Markdown manual content reflecting new qtest flags.
docs/manual.classical-zh.html	Regenerates HTML manual content reflecting new qtest flags.

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