REST + CLI mirror for loopover_check_test_evidence

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Context

The MCP tool loopover_check_test_evidence (src/mcp/server.ts:2122, via checkTestEvidence at src/mcp/server.ts:3653-3676) is the same deterministic-lint tier as loopover_check_slop_risk (rate-limit-only gate, pure classifyTestCoverage/hasLocalTestEvidence computation). No REST route or CLI mirror exists.

Requirements

• Add POST /v1/lint/test-evidence delegating to the same classification logic.
• Add a test-evidence CLI subcommand.

Deliverables

• POST /v1/lint/test-evidence route
• test-evidence CLI subcommand
• Unit test

Test Coverage Requirements

99%+ Codecov patch coverage on every changed line and branch in the new route/tool/CLI code, plus a test asserting output parity between the mirrored surfaces for identical input.

Expected Outcome

Test-evidence checks are available over REST/CLI, matching the other deterministic lint tools' parity.

Links & Resources

Precedent: POST /v1/lint/slop-risk + slopRiskCli.

[linear-code]

JSO-4563