fix(agent): make agent list --all and --type filter as documented - #4302

Problem

Two ruflo agent list flags don't do what their help text says:

• agent list --all ("Include inactive agents") prints No agents found matching criteria even when agents exist. The command sends status: 'all' to agent_list, and the tool treats any status as a literal filter (a.status === 'all'), so every agent is filtered out.
• agent list --type coder lists every agent type. The command sends agentType, but agent_list only reads status, domain and includeTerminated, so the filter is dropped. The tool's own description says to "Filter by status/domain/agentType if needed".

Repro: ruflo agent spawn -t coder, ruflo agent spawn -t tester, then ruflo agent list --all (empty) and ruflo agent list --type tester (shows the coder too).

Fix

• agent list --all now sends includeTerminated: true, which is how agent_list already includes terminated agents. --status is still passed through unchanged.
• agent_list accepts an optional agentType (added to the input schema, checked with validateIdentifier like status and domain) and filters on it. It is also echoed in filters.

Tests

New __tests__/agent-list-filters.test.ts spawns a coder, a tester and a terminated coder in a temp workspace. It checks agent_list({ agentType }), and runs the real agent list action with no flags, --all, --type, and --type --all. 3 of the 4 tests fail on main and all pass with this change.

I also ran agent-provider-model-propagation, agent-registry-concurrency-r50, mcp-tools-deep, commands, commands-deep and agent-logs-hive-resolution. The only failures are the two Memory Commands tests in commands.test.ts, and they fail the same way on main in my partial local install. tsc --noEmit reports nothing for the changed files.

This touches the agent_list handler next to #4301 but not the same lines, so the two merge independently.

This change was prepared with AI assistance; I reviewed the diff and ran the tests above locally.