ci(test): verbose output and 60% coverage threshold

[oxGrad]

Summary

Improves the Test CI job with verbose output and an enforced coverage threshold.

Changes

Run tests step — adds -v and -coverprofile=coverage.out:

• -v prints each test name (=== RUN, --- PASS, --- FAIL) as it runs, making failures immediately visible in the job log without having to dig through collapsed output
• -coverprofile=coverage.out collects statement coverage across all packages

Show coverage report step — runs go tool cover -func=coverage.out:

• Prints a per-function breakdown showing exact coverage for every function across all packages

Enforce 60% coverage threshold step — parses the total: line and fails the job if below 60%:

Total coverage: 67.5%
OK: coverage 67.5% meets the 60% threshold

Uses awk for the float comparison (no extra dependencies).

Current coverage

Package	Coverage
internal/config	96.0%
internal/resolver	100.0%
internal/linker	75.0%
total	67.5%

main and cmd have no test files (cobra wiring); all logic lives in internal/ which is well covered.

Test plan

• go test -v -coverprofile=coverage.out ./... runs locally and total is 67.5%
• Threshold script passes: 67.5 < 60 is false → exit 0
• Verify job log shows individual test names on the PR check run