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Tabish Bidiwale 93326be3e9 fix: prevent false "already configured" detection for tools
Fixes #195

## Problem
Users with existing tool config files (like CLAUDE.md) would see those
tools marked as "already configured" even when running `openspec init`
for the first time. This caused confusion as users thought OpenSpec was
already set up when it wasn't.

Root causes:
1. Tool detection checked only for file existence, not OpenSpec ownership
2. Detection ran even in fresh projects without openspec/ folder

## Solution
Two-part fix:

1. **Conditional detection**: Only check tool configuration when in extend
   mode (when openspec/ directory already exists). Fresh initializations
   skip the check entirely, treating all tools as unconfigured.

2. **Marker-based validation**: For tools to be considered "configured by
   OpenSpec", their files must contain OpenSpec markers (<!-- OPENSPEC:START -->
   and <!-- OPENSPEC:END -->). For tools with both config files and slash
   commands (like Claude Code), BOTH must have markers.

## Changes
- Modified getExistingToolStates() to accept extendMode parameter
- Rewrote isToolConfigured() to verify OpenSpec markers in files
- Added OPENSPEC_MARKERS to imports
- Added 4 comprehensive test cases covering the new behavior

## Test Coverage
- Fresh init with existing CLAUDE.md → NOT shown as configured ✅
- Fresh init with existing slash commands → NOT shown as configured ✅
- Extend mode with OpenSpec files → shown as configured ✅
- Fresh init with global Codex prompts → NOT shown as configured ✅

All 240 tests pass.
2025-10-25 19:37:48 +11:00
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