fix(ci): upgrade poetry 1.4.2 -> 2.2.1 and add package-mode = false

[TimeToBuildBob]

Problem

All submodule poetry.lock files are already in Poetry 2.x format (lock-version 2.0/2.1), but CI installs poetry==1.4.2, which can't read them. Every job logs the compatibility warning repeatedly. This fix was originally PR #1328, but that branch had accumulated a month of drift and stale submodule/workflow history that made it non-trivial to rebase — so this is a fresh PR with only the two-file change that matters.

Fix

1. Pin poetry==2.2.1 in both Qt and Tauri build steps in release.yml
   • 2.2.1 is the latest Poetry 2.x release that supports Python ≥ 3.9; 2.3.x requires ≥ 3.10, which conflicts with the matrix's python-version: 3.9
2. Add package-mode = false to the root pyproject.toml
   • Required for Poetry 2.x: the root aggregator has no installable packages, so Poetry 2 raises an error without this flag

What's NOT changed (vs #1328)

• The aw-core submodule is left at c4d31b8 (current master pointer) — the relock from aw-core#140 is already an ancestor, so that change is already included
• No other workflow changes

Validation

Triggers the full build matrix. The previous run on current master (run 29907291656) showed all jobs passing but with repeated Poetry lock-format warnings — this PR removes those warnings.

Closes #1328

[greptile-apps]

Greptile Summary

This PR updates the release builds to use Poetry 2 and marks the repository root as a non-package project. The main changes are:

• Pin Poetry 2.2.1 in the Qt release job.
• Pin Poetry 2.2.1 in the Tauri release job.
• Set package-mode = false in the root Poetry configuration.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
.github/workflows/release.yml	Updates both release jobs to install Poetry 2.2.1, which supports their Python 3.9 matrix and Poetry 2 lockfiles.
pyproject.toml	Disables package mode for a root project used to manage development dependencies rather than build an installable package.

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