test(mcp): assert tags param and tag: shorthand comma equivalence

[phernandez]

Summary

Carries the remaining piece of #918 by @jagadeeswara-ks, with original commit authorship preserved — please rebase-merge this PR (not squash) so the commit lands on main credited to its author.

@jagadeeswara-ks had the correct fix for #910 in review before our duplicate (#932) merged and auto-closed the issue. The validator swap (coerce_list → parse_tags) is therefore already on main, but his integration regression test is additive: nothing else asserts end-to-end that search_notes(tags="alpha,beta") and the tag:alpha,beta query shorthand return the same results for the same comma string — and that equivalence is the heart of #910.

The cherry-pick keeps his test verbatim and drops only the already-landed search.py hunk; his DCO sign-off is intact.

Test plan

• uv run pytest "test-int/mcp/test_search_integration.py::test_tags_param_vs_tag_query_comma_consistency" -q — passes on current main

Refs #910, #918

🤖 Generated with Claude Code

Reviewed SHA: 61ea09968889a3628c4952e9d80b436878d26147
Verdict: approve
Status: success - BM Bossbot approved this head SHA

Summary:
Reviewed the full provided diff for head SHA 61ea099. The added integration regression test exercises the MCP client/server path and introduces no blocking correctness, packaging, workflow, or compatibility risk.

Blocking findings:

• None

Non-blocking findings:

• Targeted test not run in sandbox: The filesystem is read-only in this review environment, so I did not run the pytest target. The provided diff is test-only, scoped to the MCP search integration suite, and the assertion would catch the original regression where tags='alpha,beta' was treated as one literal tag while tag:alpha,beta split correctly.

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