Feature: add --json flag to app.py for machine-readable slot diff output #511
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## Summary
`app.py` currently prints results in a human-readable format only.
For scripting, automation, CI pipelines, dashboards, or data ingestion, it would be extremely helpful to have a JSON output option.
This PR adds a `--json` flag so callers can request structured output describing:
- the slot value at block A
- the slot value at block B
- whether they differ
- the pair commitment emitted
- all arguments (address, slot, block numbers)
## Proposed Changes
- Add a `--json` boolean flag to `argparse`.
- After computing:
- `value_a`
- `value_b`
- the hex commitment (`pair_hex`)
- If `--json` is set:
- print a JSON object with keys:
- `address`
- `slot`
- `block_a`
- `block_b`
- `value_a`
- `value_b`
- `changed` (bool)
- `commitment_hex`
- then exit without printing the human-readable summary.
## Example Output
```json
{
"address": "0x1234...",
"slot": "0x0",
"block_a": 18000000,
"block_b": 18000010,
"value_a": "0x0000...",
"value_b": "0x0000...",
"changed": false,
"commitment_hex": "0xabc123..."
}
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Summary
app.pycurrently prints results in a human-readable format only. For scripting, automation, CI pipelines, dashboards, or data ingestion, it would be extremely helpful to have a JSON output option.This PR adds a
--jsonflag so callers can request structured output describing:Proposed Changes
--jsonboolean flag toargparse.value_avalue_bpair_hex)--jsonis set:addressslotblock_ablock_bvalue_avalue_bchanged(bool)commitment_hexExample Output
{ "address": "0x1234...", "slot": "0x0", "block_a": 18000000, "block_b": 18000010, "value_a": "0x0000...", "value_b": "0x0000...", "changed": false, "commitment_hex": "0xabc123..." }