Configure workflows to create draft PRs and process single files

[Copilot]

Updates test-coverage-improver and go-logger workflows to create draft PRs for easier review iteration. Constrains go-logger to process one file at a time with explicit logger reuse.

Changes

Both workflows:

• Set safe-outputs.create-pull-request.draft: true (previously false)

go-logger workflow:

• Constraint: Process exactly 1 file per PR (down from max 5)
• Constraint: Reuse existing logger declarations when present
• Selection: "Select File for Enhancement" (singular)
• Logging depth: 3-7 calls for single file (up from 2-5 for multiple files)
• Instructions: Check for existing var log = logger.New("pkg:filename") before adding new logger
• Quality checklist: Verify exactly 1 file modified and logger reuse

The single-file constraint improves review focus. Logger reuse prevents duplicate declarations like:

// Before: risk of adding duplicate
var log = logger.New("server:routed")
// ... later in file ...
var log = logger.New("server:routed")  // duplicate!

// After: explicit reuse check
// If logger exists, reuse it; otherwise add once

Original prompt

• Test coverage improver must create draft PRs
• go log adder should process one file at a time and reuse existing log infrastructure . Also create draft PRs

Custom agent used: create-agentic-workflow
Design agentic workflows using GitHub Agentic Workflows (gh-aw) extension with interactive guidance on triggers, tools, and security best practices.

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