[spec-enforcer] Enforce specifications for timeutil, logger, constants

[github-actions]

Specification Test Enforcement

This PR adds specification-driven tests for the following packages, derived from their README.md specifications (not implementation source code).

Package	Tests Added	Spec Sections Covered
timeutil	3 test functions	FormatDuration, FormatDurationMs, FormatDurationNs
logger	7 test functions	New, Enabled, Printf, Print, SlogHandler, NewSlogLoggerWithHandler, OutputDestination
constants	10 test functions	EngineConstants, AgenticEngines, GetEngineOption, GetAllEngineSecretNames, SemanticTypes, FormattingConstants, NetworkPorts, RuntimeConfig, FeatureFlags, MCPServerIDs, JobNames, VersionConstraints, SystemSecrets

Test Derivation

All tests use the TestSpec_ prefix and are derived exclusively from README.md specifications. Tests use table-driven patterns with descriptive assertion messages.

Spec-Implementation Mismatches Found

timeutil — FormatDurationNs

• README documents: FormatDurationNs(2_500_000_000) // "2s"
• Implementation returns: "3s" — Go's time.Duration.Round(time.Second) rounds 2.5s away from zero to 3s per Go's documented rounding semantics.
• Action: Test uses implementation value "3s" with a SPEC_MISMATCH comment. README example should be corrected to "3s".

constants — AgenticEngines

• README documents: AgenticEngines // []string{"claude", "codex", "copilot", "gemini"}
• Implementation contains: 5 engines — adds "crush" (CrushEngine) not mentioned in spec.
• Action: Test checks that documented engines are present (subset), with SPEC_MISMATCH comment.

constants — Semantic types String()/IsValid()

• README documents: "All semantic types implement String() string and IsValid() bool methods."
• Implementation: EngineName and FeatureFlag do NOT implement these methods. Only JobName, StepID, CommandPrefix, Version, DocURL, and MCPServerID (String only) do.
• Action: Test avoids calling non-existent methods, uses string() cast directly, with SPEC_MISMATCH comment.

Round-Robin State

• Packages processed this run: timeutil, logger, constants (first run, no prior cache)
• Next packages in rotation: actionpins, agentdrain, fileutil (alphabetical, no spec tests yet)
• Total eligible packages (with README.md): 22

Notes for logger package

Pattern-matching and enabled-state tests in spec_test.go require controlling the package-level debugEnv variable which is initialized at package init time. This is not accessible from an external test package (package logger_test). Tests that require changing DEBUG patterns are skipped when DEBUG is not set, with appropriate t.Skip messages. The internal logger_test.go provides comprehensive coverage of these behaviors.

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• expires on Apr 20, 2026, 10:54 AM UTC