[Test Improver] test: add unit tests for mcp command group (search/show/list)

[danielmeppiel]

Summary

🤖 Test Improver here - I'm an automated AI assistant. This PR was created automatically to improve test coverage.

Adds 22 new unit tests for src/apm_cli/commands/mcp.py — the apm mcp search, apm mcp show, and apm mcp list commands — which had no dedicated test file.

Goal and Rationale

The mcp command group is a user-facing feature for registry discovery. It had zero dedicated unit tests. These commands involve network calls (RegistryIntegration), Rich console output, and fallback plain-text paths — all of which benefit from being tested in isolation.

Approach

• Mock RegistryIntegration at apm_cli.registry.integration.RegistryIntegration (lazy import inside function bodies — not patchable at apm_cli.commands.mcp).
• Mock _get_console to toggle between the Rich console path and the non-Rich fallback path.
• Use Click's CliRunner via the cli entry point for realistic invocation.
• Cover: no results, results found, network error, limit-hint logic, description/package-name truncation, verbose flag.

Coverage Impact

File	Before	After (est.)
src/apm_cli/commands/mcp.py	~0%	~75%

Test Status

3130 passed in 12.33s  (was 3108 before this PR: +22 tests)

All 22 new tests pass. No regressions.

Reproducibility

uv run pytest tests/unit/test_mcp_command.py -v
uv run pytest tests/unit tests/test_console.py -x -q

Trade-offs

• RegistryIntegration must be patched at its source module, not at mcp. This is documented as a comment in the test file to avoid future confusion.
• No coverage of full Rich table rendering internals — the mock captures console.print calls and asserts they are made, which is the right level of abstraction for CLI command tests.

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