Release Listening Stack 0.3.1

[emeisazam]

Summary:

• pin Oída v0.9.1 to reviewed commit 46df4b18e51a10a46a7656fb000fdd23a639fef7
• pin GERM v0.3.1 to reviewed commit 16f427b57716cb7c4db92c68cb17a22ab1a2cde2
• advance installer, citation, documentation, changelog, and regression expectations to 0.3.1
• retain AKOÚŌ 0.9.0, Earworm 0.6.0, and Akousmata 0.6.0 as the audited compatible core

Validation:

• 56 unit tests passed
• deterministic release zipapp built and executed
• bootstrap scripts pass shell syntax validation
• both release tags resolve to the exact pinned commits
• git diff --check