Fix issues identified in formal reviews of all review-sets

[Copilot]

• Identify all 18 review-sets in .reviewmark.yaml
• Run formal code-review sub-agent for all 18 review-sets
• Fix publishing.yaml: wrong test name for VersionMark-Publish-ConflictReport
• Fix tool-config.md: replace reference to non-existent FromYamlNode with ValidateTool
• Fix version-mark-config.md: replace ReadFromFile description with Load method, note ReadFromFile as backward-compat wrapper
• Fix ContextTests.cs: Assert.Throws → Assert.ThrowsExactly (3 occurrences)

[Copilot]

Pull request overview

This PR addresses issues found during formal review across multiple review-sets by aligning requirement/test mappings, updating configuration design docs to match the current loading/linting implementation, and tightening exception assertions in tests.

Changes:

• Update MSTest assertions to use Assert.ThrowsExactly<ArgumentException> in ContextTests for stricter exception-type validation.
• Fix ReqStream publishing requirement mapping to reference the correct test for “no matching files” behavior.
• Update configuration design docs to reflect VersionMarkConfig.Load returning VersionMarkLoadResult (with LintIssues) and ReadFromFile as a backward-compatibility wrapper; update ToolConfig parsing doc to reference ValidateTool.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
test/DemaConsulting.VersionMark.Tests/Cli/ContextTests.cs	Tightens exception assertions to require exact ArgumentException type.
docs/reqstream/publishing/publishing.yaml	Corrects the referenced test name for the “no matching publish files” requirement.
docs/design/configuration/version-mark-config.md	Updates documentation to describe Load/ReadFromFile behavior consistent with current implementation.
docs/design/configuration/tool-config.md	Updates YAML parsing documentation to reference VersionMarkConfig.ValidateTool and lint issue behavior.

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