feat(gain): reset tracking stats with --reset --confirm

[sebastiancichos]

Summary

Adds a safe way to clear local rtk gain statistics without deleting the database file manually.

Usage

• rtk gain --reset --confirm (or -y / --yes) — deletes all rows in commands and parse_failures.
• rtk gain --project --reset --confirm — deletes only commands rows for the current working directory (same path rules as --project views). Parse failures are global and are not removed in project scope.

--reset without confirmation exits with an error message (no data loss).

Implementation

• Tracker::reset_all / Tracker::reset_project_commands in tracking.rs
• CLI flags on Gain: --reset, --confirm with requires = "reset" for -y
• Docs: docs/guide/analytics/gain.md, AUDIT_GUIDE.md, FEATURES.md
• Unit tests for SQLite reset and Clap parsing

Verification

cargo fmt --all && cargo clippy --all-targets && cargo test --all

[pszymkowiak]

[w] wshm · Automated triage by AI

📊 Automated PR Analysis

✨ Type	feature
🟢 Risk	low

Summary

Adds a built-in rtk gain --reset --confirm command to safely clear local tracking statistics (commands and parse failures) from the SQLite database, with support for project-scoped resets via --project. Includes a safety guard requiring explicit --confirm/-y flag to prevent accidental data loss.

Review Checklist

• Tests present
• Breaking change
• Docs updated

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Analyzed automatically by wshm · This is an automated analysis, not a human review.