Remove generated comment and auto-inherit retrieval-strategy from alwaysApply

[Copilot]

Removes the HTML comment from generated Copilot files and enables Cursor provider to automatically set retrieval-strategy: always when alwaysApply: true in source rules.

Changes

• CopilotProvider: Removed <!-- Generated by agent-rules. Do not edit this file manually. --> from output
• CursorProvider: Auto-inherit retrieval-strategy: always when alwaysApply: true unless explicitly overridden
• Tests: Added 4 test cases validating inheritance behavior and precedence rules

Example

Before, source files required both properties:

---
description: My rule
alwaysApply: true
cursor:
  retrieval-strategy: always
---

Now, only alwaysApply is needed:

---
description: My rule
alwaysApply: true
---

The Cursor provider automatically generates retrieval-strategy: always in the output. Explicit cursor.retrieval-strategy values still take precedence when specified.

Original prompt

I need to remove the <!-- Generated by agent-rules. Do not edit this file manually. --> from generated rules. I also need to ensure that the alwaysApply in the frontmatter of the source-files is correctly inherited for respective special rules, e.g. cursor: retrieval-strategy: always, so that a user can avoid defining both and only using alwaysApply

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