Exclude README.md files from workflow discovery

[Copilot]

README.md files in .github/workflows/ were incorrectly treated as agentic workflows, causing them to be compiled and included in status listings.

Changes

• Added filtering helpers (workflows.go)

  • isWorkflowFile() - Case-insensitive check excludes exact "README.md" filename
  • filterWorkflowFiles() - Applies filter to markdown file lists

• Applied filtering at all discovery points:

  • status_command.go - Status checks
  • compile_helpers.go / compile_orchestration.go - Compilation
  • init.go - Initialization
  • mcp_workflow_scanner.go - MCP scanning
  • remove_command.go - Removal operations

Behavior

// Excluded (case-insensitive)
README.md, readme.md, ReadMe.md

// Still treated as workflows
README-test.md, test-README.md, my-workflow.md

Files with "README" in other positions remain valid workflows - only the exact basename "README.md" is excluded.

Original prompt

Ignore README.md files as agentic workflows, in particular ".github/workflows/README.md"

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