Add support for noticeboards

[zmoog]

Motivation

Add noticeboard support to list them and download the attachments.

Change description

Key changes:

1. Architectural restructuring - Broke down the monolithic adapter.go into specialized receivers:
   - agenda.go - AgendaReceiver interface and implementation
   - grades.go - GradesReceiver interface and implementation
   - noticeboards.go - NoticeboardsReceiver interface and implementation (NEW)
   - spaggiari.go - Centralized SpaggiariClient with Get/Post methods
2. New Noticeboard Feature - Complete implementation for:
   - Listing noticeboards (adapters/spaggiari/noticeboards.go:18)
   - Marking noticeboards as read (adapters/spaggiari/noticeboards.go:48)
   - Downloading attachments (adapters/spaggiari/noticeboards.go:63)
   - CLI commands for listing and downloading (entrypoints/cli/cmd/noticeboards/)
3. Improved Code Reusability:
   - Created SpaggiariClient with shared Get/Post methods and Unmarshal callback pattern
   - Eliminated code duplication across agenda, grades, and noticeboards
4. Test Improvements:
   - Updated mocks to use testify/mock v2.42.0 style
   - Fixed mock initialization in tests
   - Added proper mock expectations

Additional Notes

Reviewer checklist

• PR address a single concern.
• PR title and description are appropriately filled.
• Changes will be merged in main.
• Changes are covered by tests.
• Logging is meaningful in case of troubleshooting.
• Docs are updated (at least the README.md, if needed).
• History is clean, commit messages are meaningful (see CONTRIBUTING.md) and are well-formatted.

[Copilot]

Pull Request Overview

This PR adds comprehensive support for noticeboards functionality to the Classeviva CLI tool. The implementation follows a cleaner architectural pattern by breaking down the monolithic adapter into specialized receivers.

Key Changes:

• Introduced noticeboard features (list, mark as read, download attachments) with dedicated CLI commands
• Refactored the adapter architecture into specialized receivers (Agenda, Grades, Noticeboards) with a centralized SpaggiariClient
• Updated all mocks to use testify/mock v2.42.0 with improved initialization patterns

Reviewed Changes

Copilot reviewed 36 out of 37 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
adapters/spaggiari/spaggiari.go	Introduces centralized SpaggiariClient with shared Get/Post methods and factory function for creating adapters
adapters/spaggiari/noticeboards.go	Implements NoticeboardsReceiver interface with list, download, and mark-as-read functionality
adapters/spaggiari/agenda.go	Refactored agenda functionality into dedicated receiver using new Client interface
adapters/spaggiari/grades.go	Refactored grades functionality into dedicated receiver using new Client interface
adapters/spaggiari/model.go	Adds Noticeboard data structure with attachments support
commands/noticeboards.go	Implements list and download commands for noticeboards with table-formatted output
entrypoints/cli/cmd/noticeboards/	Adds CLI command handlers for noticeboard list and download operations
mocks/	Updates all mocks to v2.42.0 style with proper cleanup and new mock types for refactored interfaces
.tool-versions	Updates Go version to 1.25.1

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