Fixes and enhancements to TinyCalendar tool

[pkonal23]

Summary

Complete rewrite of the TinyCalendar tool — from a broken stub with critical bugs to a fully functional calendar with 4 LLM action types.

Changes

Bug Fixes

• Critical typo: self.calenar → self.calendar (was creating a separate dict, causing silent data loss)
• Dict unpacking bug: add_event(**event_content) instead of add_event(event_content) (was passing dict as date parameter)
• Missing validation keys: Added "date" and "owner" to valid_keys in _process_action

New Features

• find_events() — query events by date with optional hour/minute filtering
• list_events() — cross-date chronological listing with optional max_results limit
• delete_event() — remove events by title with optional start_time disambiguation; cleans up empty date keys
• FIND_EVENTS, LIST_EVENTS, DELETE_EVENT — three new LLM action types with full JSON validation
• Attendee notification — when a world reference is provided, attendees receive a socialize() notification and both agents are made mutually accessible
• JSON serialization — "calendar" added to serializable_attributes for full state persistence via to_json()/from_json()

Prompt Improvements

• actions_definitions_prompt — documented all 4 action types with field descriptions and mandatory/optional annotations
• actions_constraints_prompt — replaced empty stub with 8 actionable constraints including format rules and usage guidance

Code Quality

• Removed # TODO under development tag
• Removed unused textwrap import (replaced with utils.dedent)
• Added inline documentation for the attendee notification mechanism

Tests

• 38 unit tests covering: initialization, CRUD operations, all 4 action types, serialization round-trip, ownership enforcement, invalid field validation, time filtering, and edge cases
• All 48 tests (38 calendar + 10 tool base) pass

[pkonal23]

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