test(mcp): prove tracedecay_health behavior

[ScriptedAlchemy]

Summary

• Prove tracedecay_health through the production MCP tools/call path on a two-file fixture, not by checking that fields exist.
• Default markdown and format: json both report quality signal 8706 for two isolated modules ((1/2)^(1/5) * 10000). Markdown emits scalar fields in key order: files_analyzed then quality_signal.
• path: src/left.rs reports 0 (one component, modularity 0). path: src/missing reports 10000 and files_analyzed: 0.

Motivation

The existing health handler test only checks that detail keys are present. That still passes when every score is wrong. This pins the scores a caller actually observes.

Changes

• crates/tracedecay/tests/mcp_suite/mcp_handler_test/health_behavior_test.rs

Test plan

• scripts/require-exact-test.sh cargo test -p tracedecay --test mcp_suite --features test-transport mcp_handler_test::health_behavior_test::health_scores_two_isolated_modules_and_distinguishes_scope -- --exact — 1 passed. First run observed markdown **files_analyzed:** 2 then **quality_signal:** 8706; the rest of the score assertions matched on the rerun.
• No production code change
• The test issues the same tools/call a host uses (tracedecay_health with {}, format=json, one-file path, and a missing path)

Checklist

• No secrets, credentials, or .env files included
• No changelog entry: test-only, no user-facing product change
• Breaking changes: none

  

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