Add Session Management and Basic Querying

[cvcore]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces session management functionality along with basic querying scaffolding and updates various ledger operations to support the new session-based workflow. Key changes include:

• Addition of session methods (add, delete, commit, rollback, query, dirty, has_entry) and corresponding tests.
• Refactoring of ledger delete/remove and dirty checks to use updated methods.
• Enhancements to mutable directive conversion and new constant METADATA_BBID.

Reviewed Changes

Copilot reviewed 9 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/beanbot/utils/id_generator.py	Added an exists() method for checking ID presence in the generator.
src/beanbot/session/session.py	Introduced session management methods and integrated them with ledger operations.
src/beanbot/session/session_test.py	Added tests for session add, delete, commit, and dirty state functionality.
src/beanbot/ledger/ledger.py	Updated delete and dirty methods to use METADATA_BBID; replaced remove() with delete().
src/beanbot/ledger/ledger_test.py	Updated tests to reflect changes in ledger method naming and dirty() usage.
src/beanbot/data/directive.py	Refactored mutable directive conversion and added a reset() method.
src/beanbot/data/constants.py	Added METADATA_BBID constant.
pyproject.toml	Included recordclass and pytest-cov as new dependencies.

Comments suppressed due to low confidence (1)

src/beanbot/data/directive.py:190

• The reset() method references self._changes, but this attribute is never initialized. Consider initializing self._changes (or revising the reset logic) to properly revert changes made to the mutable directive.

        self._changes.clear()

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