feat: kick chat read path via pusher websocket

[ImpulseB23]

Kick Pusher WebSocket client in Go, Rust parser, platform tag byte dispatch.

• Go internal/kick package: Pusher protocol 7 WebSocket client with reconnect backoff, ping/pong, activity timeout, fatal close detection (4000-4099)
• Platform tag byte system: 1-byte prefix on ring buffer payloads (0x01 Twitch, 0x02 Kick, 0x03 YouTube reserved). Rust parse_batch dispatches by tag
• Twitch EventSub client updated to prepend tag byte
• Sidecar wired with kick_connect/kick_disconnect commands
• Rust parse_kick_event handles Pusher double-encoded JSON, badge mapping, timestamp parsing
• build_kick_connect_line helper for Rust host
• ADR 38: Kick auth/read strategy (Pusher for read, official API for write/mod)
• platform-apis.md Kick section updated with official API docs

[Copilot]

Pull request overview

Adds Kick chat read support end-to-end (Go sidecar Pusher client → ringbuf payload tag dispatch → Rust Kick parser), plus documentation/ADR updates describing the strategy and platform protocol.

Changes:

• Introduce Kick Pusher (protocol 7) WebSocket client in the Go sidecar and wire kick_connect / kick_disconnect commands.
• Add 1-byte platform tag prefix on ringbuf payloads and dispatch parsing in Rust by tag.
• Implement Rust Kick Pusher event parsing into UnifiedMessage, with unit tests; update docs/ADR for Kick API strategy.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
docs/platform-apis.md	Document Kick auth scopes, read strategy (Pusher), write/mod endpoints, and operational constraints.
docs/adr.md	Add ADR 38 capturing Kick read/write/mod strategy and tag-byte framing rationale.
apps/desktop/src-tauri/src/message.rs	Add Kick Pusher event → UnifiedMessage parser and Kick-focused unit tests.
apps/desktop/src-tauri/src/host.rs	Add tag-byte dispatch in parse_batch and kick_connect command serialization helper; update tests for tagged payloads.
apps/desktop/src-sidecar/internal/twitch/eventsub_test.go	Update tests to account for the new Twitch tag byte prefix.
apps/desktop/src-sidecar/internal/twitch/eventsub.go	Prepend Twitch platform tag byte before forwarding envelopes to the shared out channel.
apps/desktop/src-sidecar/internal/sidecar/sidecar.go	Wire Kick connect/disconnect command handlers and manage Kick client lifecycle in the shared client registry.
apps/desktop/src-sidecar/internal/kick/types.go	Define Pusher/Kick message framing types used by the Kick client and tests.
apps/desktop/src-sidecar/internal/kick/client_test.go	Add Kick client tests for message forwarding, ping/pong handling, fatal closes, and context cancellation.
apps/desktop/src-sidecar/internal/kick/client.go	Implement Kick Pusher WebSocket client with reconnect backoff, subscription, and forwarding tagged events to the out channel.
apps/desktop/src-sidecar/internal/control/control.go	Define platform tag byte constants and extend control.Command with chatroom_id.

[codecov]

Codecov Report

❌ Patch coverage is 83.08157% with 56 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
apps/desktop/src-sidecar/internal/kick/client.go	72.60%	24 Missing and 16 partials ⚠️
apps/desktop/src-tauri/src/host.rs	86.95%	9 Missing ⚠️
apps/desktop/src-tauri/src/message.rs	94.87%	4 Missing ⚠️
...ps/desktop/src-sidecar/internal/sidecar/sidecar.go	91.17%	1 Missing and 2 partials ⚠️

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[github-actions]

This PR has 1302 lines changed. Consider splitting it into smaller PRs for easier review.