[ci] stabilize cancellation checks and refresh Go (PLAN-CI)

[vt128]

Windows CI could fail when scheduler delay exceeded a narrow elapsed-time tolerance. The runner test now signals entry into the blocking builtin, cancels the run, checks that execution stops before the following statement, and verifies a later run can succeed. Two data-conversion test logs use Log instead of a non-constant Logf format, and the stable CI leg advances to Go 1.27.

References: PLAN-CI / ENG-01 preparation. No runtime behavior or Go floor changes in this PR.

Validation: Go 1.27.1 build, full race tests (count=2), vet, gofmt and diff checks passed. The Go 1.19 floor and Windows matrix remain required.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 5 complexity · 0 duplication

Metric	Results
Complexity	5
Duplication	0

View in Codacy

🟢 Coverage ∅ diff coverage · +0.00% coverage variation

Metric	Results
Coverage variation	✅ +0.00% coverage variation (-1.00%)
Diff coverage	✅ ∅ diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (9be5f42)	Report Missing	Report Missing	Report Missing
Head commit (0a68976)	7915 (+0)	7499 (+0)	94.74% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#177)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

¹ Codacy didn't receive coverage data for the commit, or there was an error processing the received data. Check your integration for errors and validate that your coverage setup is correct.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.54%. Comparing base (9be5f42) to head (0a68976).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #177   +/-   ##
=======================================
  Coverage   93.54%   93.54%           
=======================================
  Files          50       50           
  Lines        6316     6316           
=======================================
  Hits         5908     5908           
  Misses        259      259           
  Partials      149      149           

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