Support export feature

[nakabonne]

Close #96

What changed

Add an export feature that persists load test results for downstream processing:

• Export all data points to results.csv in a stable schema.
• Export a summary to summary-<id>.json.

How to test

go build

./ali -r 1 -d 3s --export-to ./results https://nakabonne.dev/

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 32.28571% with 237 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.51%. Comparing base (15f0b82) to head (be4738d).

Files with missing lines	Patch %	Lines
export/export.go	42.64%	88 Missing and 25 partials ⚠️
attacker/attacker.go	19.30%	43 Missing and 3 partials ⚠️
attacker/summary.go	0.00%	43 Missing ⚠️
main.go	47.83%	9 Missing and 3 partials ⚠️
gui/drawer.go	30.77%	9 Missing ⚠️
gui/keybinds.go	10.00%	9 Missing ⚠️
gui/gui.go	40.00%	2 Missing and 1 partial ⚠️
attacker/fake_attacker.go	0.00%	2 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #140      +/-   ##
==========================================
- Coverage   60.82%   54.51%   -6.31%     
==========================================
  Files          11       13       +2     
  Lines         929     1266     +337     
==========================================
+ Hits          565      690     +125     
- Misses        329      504     +175     
- Partials       35       72      +37     

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[Copilot]

Pull request overview

This pull request adds an export feature to persist load test results for downstream processing. The feature allows users to export attack results to CSV and JSON formats using the new --export-to flag.

Changes:

• Added --export-to CLI flag to export results to a specified directory
• Implemented CSV export for individual request data points (results.csv)
• Implemented JSON export for aggregated summary statistics (summary-<id>.json)

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
export/export.go	Core export logic with atomic file writes, CSV/JSON serialization, and proper error handling
export/export_test.go	Comprehensive unit tests covering basic functionality, edge cases, and atomic writes
export_golden_test.go	Golden file tests validating CSV and JSON schema correctness
export_pending_test.go	Integration tests for CLI export functionality
attacker/attacker.go	Integration of export functionality into the attack loop with UUID generation
attacker/summary.go	Conversion of metrics to export summary format
attacker/fake_attacker.go	Updated FakeAttacker to return error from Attack method
attacker/attacker_test.go	Updated tests for new Attack signature
gui/keybinds.go	Modified attack function to handle and propagate export errors
gui/gui.go	Export error handling in GUI lifecycle
gui/drawer.go	Thread-safe export error tracking
main.go	CLI integration with directory validation and exporter initialization
main_test.go	Updated CLI tests to include exportTo field
docs/export.md	User-facing documentation explaining export feature usage
docs/rfc/001-export.md	Design document with requirements and specifications
README.md	Updated with export feature description
testdata/export/*	Golden test data files for various scenarios

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