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solution.md updated

docs/03_tests/40_user_input_recovery_spec.md

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+# Acceptance Test: AC-6 - User Input Recovery
+
+## Summary
+Validate Acceptance Criterion 6: "In case of being absolutely incapable of determining the system to determine next, second next, and third next images GPS, by any means (these 20% of the route), then it should ask the user for input for the next image."
+
+## Linked Acceptance Criteria
+**AC-6**: User input requested after 3 consecutive failures
+
+## Test Steps
+
+### Step 1: Simulate Triple Failure
+- **Action**: Process flight where L1, L2, L3 all fail for AD000003, AD000004, AD000005
+- **Expected Result**: After 3rd consecutive failure, system requests user input via SSE event
+
+### Step 2: User Receives Notification
+- **Action**: SSE client receives "user_input_required" event
+- **Expected Result**: Event includes image needing fix (AD000005), top-3 satellite tiles for reference
+
+### Step 3: User Provides GPS Fix
+- **Action**: User submits GPS for AD000005: POST /api/v1/flights/{id}/images/AD000005/user_fix
+- **Expected Result**: Fix accepted, confidence=1.0, processing resumes
+
+### Step 4: System Incorporates Fix
+- **Action**: Factor graph adds user fix as high-confidence GPS anchor
+- **Expected Result**: Trajectory refined incorporating user input
+
+### Step 5: Processing Continues
+- **Action**: System processes AD000006 and beyond
+- **Expected Result**: Processing continues normally
+
+## Success Criteria
+- User input requested after 3 consecutive failures (not before)
+- User notified via SSE with relevant info
+- User fix incorporated with high confidence
+- Processing resumes automatically
+- Allows up to 20% of route to need user input (12 out of 60 images)
+
+## Pass/Fail Criteria
+**Passes If**: User input mechanism works, threshold correct (3 failures), processing resumes
+**Fails If**: User input not requested, or system cannot incorporate user fixes
+