chore: release 0.3.8

[stevessr]

What changed

• establish an Olm session on demand before answering same-account room-key requests
• send encrypted m.forwarded_room_key responses and explicit m.room_key.withheld outcomes
• reuse and throttle missing-session request IDs, then cancel requests after a successful import
• run proactive distribution immediately and use a 30-second fallback interval when enabled
• preserve event-driven lazy mode when proactive exchange is disabled and the interval is zero, including sharing on device-list changes
• document the E2EE modes and bump the plugin version to 0.3.8

Root cause

The response path attempted to encrypt directly with an existing Olm session. A newly requesting sibling device usually had no session yet, so the response failed. The proactive toggle also did not activate periodic room-key checks when the configured interval remained at its default zero.

Validation

• PYTHONPATH=tests/unit uv run pytest -q (147 passed, 11 subtests)
• uv run ruff check .
• python -m compileall -q .
• JSON metadata and translation validation
• git diff --check

[gemini-code-assist]

Code Review

This pull request introduces an event-driven 'lazyload' mode for room-key distribution when proactive key exchange is disabled and the check interval is set to 0. In this mode, keys are shared on encrypted sends or when device lists change, rather than via periodic scans. The changes include updates to configuration parsing, logging, documentation, translations, and unit tests verifying the lazy mode behavior. There are no review comments, so I have no feedback to provide.

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[Copilot]

Pull request overview

This PR finalizes the 0.3.8 release by clarifying and validating the “proactive vs lazy (event-driven)” room-key sharing behavior, updating related docs/translations, and bumping release metadata.

Changes:

• Add/extend unit tests to cover default interval behavior and event-driven key sharing on device-list changes.
• Update E2EE documentation, config metadata, and translations to describe lazy mode semantics when the interval is 0.
• Bump plugin version to 0.3.8 and add the 0.3.8 changelog entry.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/unit/test_matrix_new_spec_compat.py	Adds coverage for default interval selection and lazy-mode sharing on device-list changes.
README.md	Updates configuration documentation for matrix_e2ee_key_share_check_interval lazy-mode semantics.
processors/event_processor_streams.py	Adjusts warning log when device-list-triggered key sharing fails.
metadata.yaml	Bumps plugin version to 0.3.8.
i18n/zh-CN.json	Updates hint text for key-share interval behavior (lazy mode vs proactive).
i18n/ru-RU.json	Updates Russian hint text for key-share interval behavior.
i18n/en-US.json	Updates English hint text for key-share interval behavior.
e2ee/e2ee_manager.py	Clarifies docstring and adds a lazy-mode startup log when interval is 0.
e2ee/e2ee_manager_sessions.py	Expands docstring for device-list change key-sharing path (relevant to lazy mode).
config.py	Updates inline comment documenting interval=0 semantics.
config_metadata.json	Updates config hint to describe lazy-mode behavior when proactive exchange is off.
CHANGELOG.md	Adds 0.3.8 entry describing the updated key-sharing behavior.

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