feat: add cli-v2 integration tests for validate, inspect, compare, convert

[mogbonjubolaolasunkanmi-art]

Summary

Adds four integration test files for the devkit cli-v2 subcommands as described in the assigned issues.

Files added

• packages/devkit/tests/cli_validate.rs — 9 tests (issue [devkit/cli-v2] Write integration test for validate subcommand #404)
• packages/devkit/tests/cli_inspect.rs — 11 tests (issue [devkit/cli-v2] Write integration test for inspect subcommand #405)
• packages/devkit/tests/cli_compare.rs — 11 tests (issue [devkit/cli-v2] Write integration test for compare subcommand #406)
• packages/devkit/tests/cli_convert.rs — 11 tests (issue [devkit/cli-v2] Write integration test for convert subcommand #407)

What each test suite covers

cli_validate (#404): Runs devkit validate on clean and dirty fee CSV files, asserts exit codes and output messages (header check, column count, non-numeric fee rejection, empty input, determinism).

cli_inspect (#405): Runs devkit inspect on a known seeded fee file; asserts percentile table values (p25/median/p75/p95/p99 ordering), min/max, mean within range, spike fees exceed base, sequential timestamps.

cli_compare (#406): Creates two synthetic fee files (low-fee quiet vs high-fee congested), runs compare, asserts delta values: mean_diff is negative, mean_diff_pct direction, manually computed exact deltas, identical-dataset diff = 0.

cli_convert (#407): Converts a CSV to JSON and back; asserts round-trip produces identical records for both CSV↔points and JSON↔points, including spike-flag preservation.

Testing

All 42 tests pass locally with zero warnings:

test result: ok. 9 passed; 0 failed  (cli_validate)
test result: ok. 11 passed; 0 failed (cli_inspect)
test result: ok. 11 passed; 0 failed (cli_compare)
test result: ok. 11 passed; 0 failed (cli_convert)

Closes #404
Closes #405
Closes #406
Closes #407

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