feat: replace "id" by "urn"

[alexec]

URNs are more formal way to create resource names.

[Copilot]

Pull request overview

This pull request replaces the "id" field with "urn" field throughout the codebase and migrates from github.com/goccy/go-yaml to the standard gopkg.in/yaml.v3 library. The change introduces a URN (Uniform Resource Name) format for identifying tasks, rules, and commands using the pattern urn:agents:<type>:<name>.

Changes:

• Refactored frontmatter structure by consolidating ID, Name, and Description fields into BaseFrontMatter, which is now embedded in all frontmatter types
• Replaced all references from ID field to URN field, with YAML serialization still using the "id" tag name
• Migrated YAML parsing library from github.com/goccy/go-yaml to gopkg.in/yaml.v3
• Removed auto-generation logic (generateIDFromPath() function and its callers) that previously set IDs from filenames
• Updated all test cases to use explicit URN values in frontmatter with proper URN format

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
pkg/codingcontext/markdown/frontmatter.go	Restructured frontmatter types by moving ID/Name/Description to BaseFrontMatter; renamed ID field to URN
pkg/codingcontext/result.go	Updated MCPServers() to use URN instead of ID as map keys
pkg/codingcontext/context.go	Removed generateIDFromPath() function and all auto-ID-generation logic
pkg/codingcontext/result_test.go	Updated test data to use URN format; removed test case for auto-generated IDs
pkg/codingcontext/context_test.go	Updated tests to verify explicit URN handling; removed auto-generation test cases
pkg/codingcontext/markdown/frontmatter_task_test.go	Updated all test cases to use URN field with proper format
pkg/codingcontext/markdown/frontmatter_rule_test.go	Updated all test cases to use URN field with proper format
pkg/codingcontext/markdown/frontmatter_command_test.go	Updated all test cases to use URN field with proper format
pkg/codingcontext/markdown/markdown.go	Updated import to use gopkg.in/yaml.v3
pkg/codingcontext/mcp/mcp_test.go	Updated import to use gopkg.in/yaml.v3
go.mod	Removed goccy/go-yaml dependency; moved gopkg.in/yaml.v3 from indirect to direct
go.sum	Removed goccy/go-yaml checksums

[Copilot]

@alexec I've opened a new pull request, #206, to work on those changes. Once the pull request is ready, I'll request review from you.