feat(channels): use plain text as default output formatter for Signal

[rozsival]

Summary

Till this day, Signal does not support Markdown formatting. For that reason, it makes better sense to default its output formatter to PlainText.

Resources:

• https://community.signalusers.org/t/beta-feedback-for-the-upcoming-android-6-23-release/53790/44
• https://support.signal.org/hc/en-us/articles/6325622209178-Text-Formatting

Changes

• default output formatter for signal channel set to PlainText
• fixed formatting with cargo fmt
• fixed clippy warning in openfang-runtime

Testing

• cargo clippy --workspace --all-targets -- -D warnings passes
• cargo test --workspace passes
• Live integration tested (if applicable)

Security

• No new unsafe code
• No secrets or API keys in diff
• User input validated at boundaries

[Copilot]

Pull request overview

Updates channel output formatting defaults so Signal uses plain text by default (since Signal does not support Markdown), and applies rustfmt/clippy-driven cleanups across the workspace.

Changes:

• Set Signal’s default output format to PlainText in the channel bridge.
• Apply cargo fmt-style formatting updates across several crates.
• Address a clippy warning in SSRF-related tests (== false → !...).

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
crates/openfang-runtime/src/web_search.rs	Rustfmt formatting for SearxNG request URL construction.
crates/openfang-runtime/src/web_fetch.rs	Test formatting + clippy cleanup in SSRF/allowlist tests.
crates/openfang-runtime/src/tool_runner.rs	Rustfmt formatting around exec policy allowlist validation.
crates/openfang-runtime/src/session_repair.rs	Rustfmt formatting in test predicate match arm.
crates/openfang-runtime/src/mcp.rs	Rustfmt formatting for transport config builder usage.
crates/openfang-kernel/src/kernel.rs	Rustfmt formatting for constants and manifest comparison expression.
crates/openfang-hands/src/registry.rs	Rustfmt formatting in a unit test (single-line binding).
crates/openfang-cli/src/tui/screens/hands.rs	Rustfmt formatting for HandsAction::ActivateHand construction.
crates/openfang-channels/src/discord.rs	Rustfmt formatting in a JSON equality assertion test.
crates/openfang-channels/src/bridge.rs	Behavior change: default output format for signal set to PlainText.
crates/openfang-api/tests/api_integration_test.rs	Rustfmt formatting in an integration test assertion.
crates/openfang-api/src/routes.rs	Rustfmt formatting in message filtering logic.

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