refactor: Flatten repository structure

[Snider]

• Move Go files from core, e, and runtime directories to the project root.
• Unify package declarations to a single 'core' package.
• Update go.work to exclude the cmd directory from the main build.
• Resolve naming conflicts and update import paths.
• Fix tests to work with the new structure.

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Summary by CodeRabbit

Release Notes

• Refactor

  • Reorganised core package structure for improved API clarity and namespace consistency.
  • Simplified service runtime initialisation by streamlining constructor and factory APIs.

• Bug Fixes

  • Service names are now consistently normalised to lowercase, ensuring uniform identifier handling throughout the system.

Walkthrough

This PR consolidates runtime-related code by migrating files from package e to core, replacing the generic Runtime type with a new ServiceRuntime variant, refactoring the runtime package into core with a simplified API, normalising service names to lowercase, and updating associated test paths.

Changes

Cohort / File(s)	Summary
Package Migration e.go, e_test.go	Package declarations changed from package e to package core, integrating error/runtime types into the core namespace.
Runtime Generic Type Refactoring core/runtime.go (removed), runtime.go (added)	Removed the generic Runtime[T any] type and its methods from core/runtime.go. Introduced new ServiceRuntime[T any] generic type in runtime.go with constructor and core/config accessors.
Runtime Package Restructuring runtime_pkg.go, runtime_pkg_test.go	Package declaration moved from runtime to core. Constructor renamed from New() to NewRuntime(), simplified by removing NewWithFactories() parameter. Factory options API updated to use core-package names directly (e.g., core.Option → Option). Tests updated to reference new type names and simplified constructor.
Service Name Normalisation core.go	Service name derivation now applies strings.ToLower() to the final path segment for case-insensitive handler discovery.
Test Data Path Update core_test.go	Embed directive and asset access path updated from testdata to core/testdata reflecting new file structure.

Possibly related PRs

• Snider/Core#22: Adds and exports NewWithFactories runtime construction API and related tests, directly opposing the factory-parameter removal in this PR's runtime refactoring.

Suggested labels

enhancement

Poem

🐰 A reorganisation hops along,
From e to core where it belongs,
ServiceRuntime now takes the stage,
NewRuntime simplifies the page,
Lowercase names—the code runs strong! ✨

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch refactor-flatten-repo-structure

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 856fb24 and 8b7dc42.

⛔ Files ignored due to path filters (1)

• go.work is excluded by !**/*.work

📒 Files selected for processing (8)

• core.go (1 hunks)
• core/runtime.go (0 hunks)
• core_test.go (1 hunks)
• e.go (1 hunks)
• e_test.go (1 hunks)
• runtime.go (1 hunks)
• runtime_pkg.go (4 hunks)
• runtime_pkg_test.go (2 hunks)

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