Add yq to default bash tools

[Copilot]

Overview

The yq tool is pre-installed in the GitHub Actions environment and is useful for querying YAML lock files. This PR adds yq to the default bash tools list, making it automatically available in agentic workflows without requiring explicit configuration.

Motivation

Users need to query workflow lock files to extract information like job names, and yq is the standard tool for this purpose. Since it's already installed in the environment, it should be available by default alongside other common utilities like grep, cat, and sort.

Example use case:

# Query job names from a lock file
yq '.jobs | keys' .github/workflows/example.lock.yml

Changes

Before

Users had to explicitly add yq to their tools configuration:

tools:
  bash: ["yq"]

After

The yq tool is now included automatically when bash is enabled:

tools:
  bash:  # yq is included in defaults

Implementation

• pkg/constants/constants.go: Added "yq" to the DefaultBashTools slice
• pkg/workflow/bash_merge_test.go: Updated test expectations to include yq in the default tools list

Verification

Verified that yq appears in compiled workflows for both AI engines:

• Copilot: --allow-tool 'shell(yq)'
• Claude: Bash(yq) in allowed-tools

All tests pass and the change is backward compatible with existing workflows.

Impact

• ✅ Minimal change (2 files modified)
• ✅ All unit tests pass
• ✅ Backward compatible
• ✅ 64 test workflows compile successfully
• ✅ No breaking changes

Original prompt

Try of the "yq" tool is pre installed in the environment. If some try to run queries against the lock files, like job names.
If present, add to default tool list

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