feat: update /init command to focus only on non-obvious discoveries (#7400)

* feat: update /init command to focus only on non-obvious discoveries

- Emphasize that only non-obvious information discovered by reading files should be included
- Update all mode-specific examples to show truly non-obvious rules
- Add CRITICAL section explaining what qualifies as non-obvious
- Exclude standard patterns and framework defaults
- Focus on gotchas, hidden requirements, and counterintuitive patterns

* fix: ensure /init command checks for and updates existing AGENTS.md files

- Check for existing AGENTS.md in root directory
- Check for existing AGENTS.md in all .roo/rules-*/ directories
- Read and improve existing files rather than replacing them
- Update discovery phase to explicitly look for these files

* refactor: clean up /init command to properly handle existing AGENTS.md files

- Consolidate all AGENTS.md path checking into step 1 with CRITICAL emphasis
- Add explicit instructions for deep dive improvement of existing files
- Remove redundant mentions throughout the workflow
- Emphasize iterating and enhancing existing files, not just appending
- Add clear guidance on cleaning up outdated info and reorganizing
- Make discovery phase the single source of truth for file checking

* fix: strengthen /init command to aggressively remove obvious information

- Add explicit instructions to DELETE obvious information first
- Emphasize that files should get SHORTER, not longer
- Use stronger language: CRITICALLY EVALUATE, AGGRESSIVELY DELETE
- Make clear that standard practices must be removed even if previously included
- Add success metric: files should be more concise and valuable
- Goal is to fix the tendency to just append instead of clean up

* fix: ensure .roo directory is created in project root, not system root

CRITICAL FIX: Paths were being interpreted as absolute, causing .roo to be created at system root

- Clarify all paths are relative to PROJECT/WORKSPACE root
- Add explicit warnings that .roo must be in project root, not system root
- Update example to show proper project structure
- Add IMPORTANT notes throughout emphasizing relative paths
- Fix prevents accidental creation of /.roo at system level

* test: update built-in-commands test to match new init command content

- Replace 'mode-specific rule directories' with 'non-obvious'
- Replace 'analysis_workflow' with 'discovered by reading files'
- Tests now align with the new focus on non-obvious discoveries

Author: hannesrudolph

src/services/command/__tests__/built-in-commands.spec.ts

@@ -89,8 +89,8 @@ describe("Built-in Commands", () => {
 			expect(content).toContain("Please analyze this codebase")
 			expect(content).toContain("Build/lint/test commands")
 			expect(content).toContain("Code style guidelines")
-			expect(content).toContain("mode-specific rule directories")
-			expect(content).toContain("analysis_workflow")
+			expect(content).toContain("non-obvious")
+			expect(content).toContain("discovered by reading files")
 
 			// Should mention important concepts
 			expect(content).toContain("AGENTS.md")