* feat(agent): add tool_filter_groups for per-turn MCP tool schema filtering
Introduces per-turn MCP tool schema filtering to reduce token overhead when
many MCP tools are registered. Filtering is driven by a new config field
`agent.tool_filter_groups`, which is a list of named groups that each
specify tool glob patterns and an activation mode (`always` or `dynamic`).
Built-in (non-MCP) tools always pass through unchanged; the feature is fully
backward-compatible — an empty `tool_filter_groups` list (the default) leaves
all existing behaviour untouched.
Changes:
- src/config/schema.rs: add `ToolFilterGroupMode`, `ToolFilterGroup` types
and `tool_filter_groups` field on `AgentConfig`
- src/config/mod.rs: re-export `ToolFilterGroup`, `ToolFilterGroupMode`
- src/agent/loop_.rs: add `glob_match()`, `filter_tool_specs_for_turn()`,
`compute_excluded_mcp_tools()` helpers; wire call sites in both single-shot
and interactive REPL modes; add unit tests for all three functions
- docs/reference/api/config-reference.md: document `tool_filter_groups`
field and sub-table schema with example
- docs/i18n/el/config-reference.md: add Greek locale config-reference with
`tool_filter_groups` section (2026-03-12 update)
* Remove accidentally committed worktree directories
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Co-authored-by: argenis de la rosa <theonlyhennygod@gmail.com>
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