fix: Make 'wizard clear' parse agent configs and harden deletion safety

[urmispring]

Summary

• wizard clear now parses each AI agent's config (Claude Code, Hermes, Cursor, Codex, ...) via agent_parser.get_all_indexed_projects() to discover CodeNexus-wired projects, instead of only scanning ~/ .codenexus and home subdirs.
• Only lists projects that actually have an index on disk (find_codenexus_index).
• Hardened deletion safety: unique idx-N ids, --dry-run flag, and path-based confirmation (must type the exact project directory name to delete), preventing accidental removal of a real index.

Root cause

The previous wizard clear never imported agent_parser and simply globbed ~/ .codenexus, ./.codenexus, and one level of home subdirs. It ignored the already-built agent config parsers, so it could miss agent-wired projects or delete the wrong thing.

Verification

• pytest tests/ still passes (12/12).
• Confirmed via mocked runs: dry-run removes nothing, wrong confirmation token cancels, correct token deletes only the targeted dummy index; real project indexes preserved.

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