Add exclude_calendars parameter to calendar_list_events and calendar_search_events

[fmasi]

Summary

Adds an optional exclude_calendars: list[str] | None parameter to calendar_list_events and calendar_search_events (and the underlying EventKitStore.get_events / search_events). When provided, calendars whose title() matches any entry (case-insensitive, exact match) are dropped from the EventKit fetch.

Closes #4.

Design notes

• Server-side, not post-fetch. The exclusion is applied to the calendars list passed into predicateForEventsWithStartDate_endDate_calendars_, so excluded calendars are never fetched in the first place — no wasted serialization.
• Mutually exclusive with calendar_name. When the caller specifies a single calendar via calendar_name, exclude_calendars is ignored (a single-include and an exclude list together would be incoherent). Documented in the docstring.
• Backwards-compatible. Default is None, so existing callers see identical behavior.
• Match-only-exact for v1. Per the issue's "case-insensitive exact match is fine for a first cut", no glob/wildcard support in this PR. Happy to add *@domain.com style globs as a follow-up if you want it.

Diff scope

Two files, 28 insertions / 3 deletions:

• src/apple_eventkit_mcp/eventkit_store.py — add param to get_events and search_events; apply filter when calendar_name is unset
• src/apple_eventkit_mcp/calendar_tools.py — surface the param on the two MCP tools, pass through to the store

Test plan

• Existing callers (no exclude_calendars arg) behave identically
• calendar_list_events(start, end, exclude_calendars=["Holidays in Canada"]) returns events from all calendars except that one
• Mixed case works: exclude_calendars=["HOLIDAYS in canada"] still excludes
• calendar_list_events(start, end, calendar_name="Wellbeing", exclude_calendars=["Wellbeing"]) returns Wellbeing events (single-include wins)
• calendar_search_events(query="x", exclude_calendars=[...]) filters search scope the same way

No existing test suite to extend; smoke-tested locally against my real calendar.

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