fix: replace string concatenation loop with strings.Builder in spec_test.go

[Copilot]

golangci-lint (modernize/stringsbuilder) was failing on main due to inefficient string concatenation in a loop.

Change

Replaced += string accumulation with strings.Builder in TestSpec_PublicAPI_RenderTitleBox:

// Before
combined := ""
for _, line := range result {
    combined += line + "\n"
}
assert.Contains(t, combined, "Audit Report", ...)

// After
var sb strings.Builder
for _, line := range result {
    sb.WriteString(line)
    sb.WriteString("\n")
}
assert.Contains(t, sb.String(), "Audit Report", ...)

[Copilot]

Pull request overview

Updates test code and documentation to address linting concerns and keep workflow status docs current.

Changes:

• Replaced loop-based string concatenation with strings.Builder in TestSpec_PublicAPI_RenderTitleBox to satisfy golangci-lint (modernize/stringsbuilder).
• Added a new “Daily Cache Strategy Analyzer” entry to the agent factory status documentation table.

Show a summary per file

File	Description
pkg/console/spec_test.go	Uses strings.Builder to efficiently assemble multi-line output in a test, resolving the linter complaint.
docs/src/content/docs/agent-factory-status.mdx	Adds the “Daily Cache Strategy Analyzer” workflow row to the status table.

Copilot's findings

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• Files reviewed: 2/2 changed files
• Comments generated: 0

[github-actions]

🧪 Test Quality Sentinel Report

Test Quality Score: 70/100

⚠️ Acceptable, with suggestions

Metric	Value
New/modified tests analyzed	1
✅ Design tests (behavioral contracts)	1 (100%)
⚠️ Implementation tests (low value)	0 (0%)
Tests with error/edge cases	0 (0%)
Duplicate test clusters	0
Test inflation detected	N/A (no production lines changed)
🚨 Coding-guideline violations	None

---

Test Classification Details

Test	File	Classification	Issues Detected
TestSpec_PublicAPI_RenderTitleBox	pkg/console/spec_test.go:390	✅ Design	No error/edge cases; happy-path only

---

Flagged Tests — Requires Review

No tests flagged for blocking concerns. One minor observation:

i️ TestSpec_PublicAPI_RenderTitleBox — No error/edge cases

Classification: Design test (behavioral contract)
Issue: The test only validates the happy path (title is present in rendered output). No edge cases are covered (e.g., empty title, title longer than box width, width=0).
What design invariant does this test enforce? That RenderTitleBox returns non-empty output containing the provided title string — a valid behavioral contract.
What would break if deleted? A regression where the title is omitted from the rendered box output would go undetected.
Suggested improvement: Consider adding a row for an empty title or a title wider than the box to strengthen coverage. Not required for this PR since it is a refactoring change.

---

Additional Observation — PR Title Mismatch

⚠️ The PR title says "replace string concatenation loop with strings.Builder" but the actual diff does the opposite: it replaces strings.Builder with simple string concatenation (combined += line + "\n"). The title appears to describe the change in reverse. This is cosmetic but worth correcting for clarity in the commit history.

---

Language Support

Tests analyzed:

• 🐹 Go (*_test.go): 1 test modified — unit (//go:build !integration ✅)
• 🟨 JavaScript (*.test.cjs, *.test.js): 0 tests

---

Verdict

✅ Check passed. 0% of new tests are implementation tests (threshold: 30%). No coding-guideline violations detected. Score deducted 30 points for missing error/edge-case coverage in the modified test, but this is a refactoring PR with no semantic behavioral changes.

---

📖 Understanding Test Classifications

Design Tests (High Value) verify what the system does:

• Assert on observable outputs, return values, or state changes
• Cover error paths and boundary conditions
• Would catch a behavioral regression if deleted
• Remain valid even after internal refactoring

Implementation Tests (Low Value) verify how the system does it:

• Assert on internal function calls (mocking internals)
• Only test the happy path with typical inputs
• Break during legitimate refactoring even when behavior is correct
• Give false assurance: they pass even when the system is wrong

Goal: Shift toward tests that describe the system's behavioral contract — the promises it makes to its users and collaborators.

References: §24934722606

🧪 Test quality analysis by Test Quality Sentinel · ● 553.4K · ◷

[github-actions]

✅ Test Quality Sentinel: 70/100. Test quality is acceptable — 0% of new tests are implementation tests (threshold: 30%). No coding-guideline violations detected. The change is a refactoring of test helper code (strings.Builder → string concatenation) with no behavioral impact on the tests.