fix(data): include missing fields in activity output

[mvanhorn]

Summary

Adds missing fields to polymarket data activity output that are present in the underlying REST API (https://data-api.polymarket.com/activity).

Fixes #29

Fields added

Field	JSON output	Table output
side	"BUY" / "SELL" / null	Side column
price	"0.55" / null	Price column
outcome	"Yes" / "No" / null	Outcome column
outcome_index	0 / 1 / null	-
asset	token ID string / null	-
condition_id	"0xdc2a..." / null	-
slug	"market-slug" / null	-

The side field is critical for distinguishing buys from sells in non-CLOB activity records, which was the core issue reported.

Changes

File	Change
src/output/data.rs	Add 7 fields to JSON output, add Side/Outcome/Price columns to table output

Test plan

• cargo fmt --check passes
• cargo clippy -- -D warnings passes
• cargo test — all 131 tests pass

This contribution was developed with AI assistance (Claude Code).

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Note

Low Risk
Output-only changes that add fields/columns without altering request logic or persistence; risk is limited to minor formatting/compatibility impacts for consumers parsing the CLI output.

Overview
Updates print_activity output to surface previously omitted activity metadata.

Table output now includes new Side, Outcome, and Price columns (with - for missing values), and JSON output now includes side, outcome, outcome_index, price, asset, condition_id, and slug fields in addition to the existing activity data.

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