Clear local configs

Removes two things to put the user back at first-run state:

• ${XDG_CONFIG_HOME:-~/.config}/agentic-analytics/bucket.json – runtime config init writes.
• The agentic-analytics profile in ~/.aws/credentials and ~/.aws/config – the AWS creds the user set up via aws configure.

Leaves the data lake at ${AGENTIC_ANALYTICS_DATA_DIR:-~/.local/share/agentic-analytics}/ (DPL parquet + catalog.duckdb, and the plugin's venv/) alone. Re-pulling DPL is slow; the lake is data, not config. To rebuild it, run /agentic-analytics:refresh-cache instead.

After running this, the init flow walks the user through setup again from scratch (asks for the bucket, walks them through aws configure).

Output discipline

This is a one-shot housekeeping flow. Output the verbatim line below at the start, run the script, then stop. Don't narrate the script output.

Steps

0. Resolve the plugin root. The snippet below assumes $plugin_root is set in that shell invocation: