fix(command-queue): Improve command queueing mechanism

[MarekSuchanek]

No description provided.

[Copilot]

Pull request overview

This PR updates the dsw-command-queue processing loop to improve correctness and operational behavior under load/failures (locking, retry/backoff, notification handling), and includes a small dsw-database model fix plus dependency updates needed for psycopg-based notification waiting.

Changes:

• Refactors command selection/backoff and adds explicit row-lock + savepoint handling to avoid concurrent processing and unintended commits on failure.
• Reworks queue listening/notification waiting and iteration-level retry behavior; replaces func-timeout with an in-process timeout approach and adds psycopg[binary].
• Fixes PersistentCommand.created_by conversion so NULL stays None (instead of becoming 'None'), and updates changelogs/spell dictionary accordingly.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
uv.lock	Updates locked dependencies (removes func-timeout, adds psycopg[binary]).
packages/dsw-database/dsw/database/model.py	Adjusts created_by mapping for PersistentCommand to preserve None.
packages/dsw-database/CHANGELOG.md	Documents the created_by mapping fix.
packages/dsw-command-queue/pyproject.toml	Replaces func-timeout with psycopg[binary]>=3.2 dependency.
packages/dsw-command-queue/dsw/command_queue/query.py	Updates command selection query and adds lock/savepoint queries.
packages/dsw-command-queue/dsw/command_queue/command_queue.py	Major refactor: listening lifecycle, notification receiving, locking/savepoints, retry behavior, timeout mechanism.
packages/dsw-command-queue/dsw/command_queue/init.py	Exposes newly introduced public exception types.
packages/dsw-command-queue/CHANGELOG.md	Documents queue correctness/behavior changes and dependency replacement.
.cspell/dictionary.txt	Adds timestamptz to spelling dictionary.

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