data activity: response missing side, price, and other fields present in REST API

[coolestowl]

Summary

The `polymarket data activity ` command returns a subset of fields compared to the underlying REST API (`https://data-api.polymarket.com/activity\`). Most notably, the `side` field (BUY/SELL) is absent from the CLI output, making it impossible to distinguish buy trades from sell trades for non-CLOB activity records.

Fields missing from CLI output

The REST API returns these fields for `TRADE` activity records, none of which appear in the CLI JSON output:

Field	Example value
`side`	`"BUY"` / `"SELL"`
`price`	`0.55`
`asset`	`"76696946120120342..."`
`outcomeIndex`	`1`
`outcome`	`"Down"`
`conditionId`	`"0xdc2a86ae..."`
`slug`	`"bitcoin-up-or-down-..."`

Impact

Without the `side` field, scripts and agents consuming `data activity` output cannot determine whether a non-CLOB trade is a buy or a sell. This caused a non-CLOB sell to be misclassified as a buy cost, inflating reported position cost by ~90%.

Non-CLOB trades (those not appearing in `data trades`) are the only records where `side` is needed — CLOB trades already have `side` available via `data trades`. But since `data activity` is the only source for non-CLOB activity, the missing field is critical.

Reproduction

# REST API — includes side, price, outcome, etc.
curl "https://data-api.polymarket.com/activity?user=<wallet>&limit=5"

# CLI — same data but side/price/outcome fields stripped
polymarket -o json data activity <wallet> --limit 5

Expected behavior

`polymarket -o json data activity` should pass through all fields returned by the underlying REST API, or at minimum include `side`, `price`, `outcome`, `outcomeIndex`, `conditionId`, and `slug`.

[RajMandaliya]

I've opened a PR for this: #30