Adjust AGENTS.md to include testing scope

[alex-rawlings-yyc]

This change is 

Summary by CodeRabbit

• Documentation
  • Updated branch coverage guidelines with new subsection clarifying scenarios for excluding specific branches from 100% coverage requirements, including defensive guards, trivial pass-throughs, wiring glue, and logging-only branches.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d47c6841-d496-47bd-8969-fc95c25ac782

📥 Commits

Reviewing files that changed from the base of the PR and between b9dec18 and 477a218.

📒 Files selected for processing (1)

• AGENTS.md

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📝 Walkthrough

Walkthrough

AGENTS.md gains a new subsection titled "Branches not worth testing" that enumerates categories of branches eligible for explicit coverage exclusions—such as defensive/unreachable guards, trivial pass-throughs, wiring glue, and logging-only branches—and states the guidance does not justify consolidating tests for branches with real behavior.

Changes

Coverage exclusion documentation

Layer / File(s)	Summary
Branches not worth testing section AGENTS.md	Adds 11 lines defining categories of branches that may be explicitly excluded from the 100% coverage requirement, and clarifies the scope of the guidance.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• sillsdev/interlinearizer-extension#55: Both PRs modify AGENTS.md to add or refine AI agent testing conventions; this PR directly extends that file with the new coverage-exclusion subsection.

Suggested reviewers

• imnasnainaec

Poem

🐇 Hop, hop, through the branches I go,
Some paths are guarded—no tests need to flow!
Defensive and trivial, logging-only too,
A note in the docs tells the AI what to do.
The warren stays tidy, the coverage stays bright,
Only branches worth testing need coverage tonight! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding content about testing scope to AGENTS.md documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent-testing-scope

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[imnasnainaec]

@imnasnainaec reviewed 1 file and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on alex-rawlings-yyc).