Refine agent cli artifacts

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[Copilot]

Pull request overview

This PR refines agent-facing CLI artifacts by adding command-specific help, improving artifact bundle reporting in doctor, and making generated artifact question IDs unique/stable.

Changes:

• Adds dedicated help text for search, explain, artifact, and mcp.
• Extends doctor to recognize manifest-backed artifact bundle directories.
• Updates suggested question IDs/labels and related tests/docs.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/cli.ts	Routes --help to command-specific help text when available.
src/cli/help.ts	Adds command-specific help constants and lookup helper.
src/cli/search.ts	Uses shared search help for missing query usage output.
src/cli/explain.ts	Uses shared explain help for missing target usage output.
src/cli/artifact.ts	Uses shared artifact help for invalid artifact subcommands.
src/cli/mcp.ts	Uses shared MCP help for invalid MCP subcommands.
src/cli/doctor.ts	Detects artifact bundle directories and reports expected artifact presence.
src/agent/artifact.ts	Ensures suggested question IDs/handles remain unique for aliased exports and SQL objects.
tests/cli-command-modules.test.ts	Adds coverage for command help routing and artifact bundle doctor reports.
tests/artifact-build.test.ts	Adds coverage for unique suggested question IDs with aliased exports.
docs/cli.md	Documents command-specific help and artifact bundle doctor support.
docs/agent-workflows.md	Updates agent workflow guidance for doctor and unique question IDs.
codegraph-skill/codegraph/SKILL.md	Updates bundled skill guidance for command help and artifact doctor usage.

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