feat(coding-agents): add OpenCode integration - #1591

Issue number: #1331

Change description:

Closes #1331.

This adds first-class OpenCode support across the coding-agent workflow:

• install the OpenLIT global plugin at $XDG_CONFIG_HOME/opencode/plugins/openlit.ts, falling back to <user-home>/.config/opencode/plugins/openlit.ts
• route supported OpenCode session, completed-assistant, and tool lifecycle events into the canonical coding-agent telemetry schema
• de-duplicate completed assistant turns and tool calls, preserve provider/model/token/cost metadata, and account for each turn exactly once when capture mode changes
• exclude message and reasoning bodies from the OpenCode event projection
• treat session.idle and session.deleted as non-terminal boundaries; minimal capture emits delta snapshots without fabricating a completed session or outcome
• keep hook delivery non-blocking with one in-flight emission and at most 32 queued events; when saturated, a later completion or session event may replace an older tool.execute.before hint, while equally important events retain FIFO order
• add executable queue regressions for deferred spawning, serial delivery, overload behavior, post-drain recovery, and subprocess failure recovery
• add OpenCode support to install, uninstall, doctor, launch, vendor discovery, onboarding, icons, and public documentation
• update the Go and TypeScript semantic-convention mirrors and synchronize the source plugin with the CLI's embedded marketplace copy

Validation completed:

• focused Go package tests passed, including the complete OpenCode hook package plus OpenCode install, uninstall, doctor, and XDG path coverage
• go build -trimpath ./... passed for the CLI
• go vet ./... passed for both cli and sdk/go
• all 4 executable queue tests passed on Node 22, Node 24.20.0, and Bun 1.4.2; the Node 22 command is wired into CLI CI
• six relevant client Jest suites passed with 129 tests
• client lint and type checking passed
• the source and embedded OpenCode plugins have identical SHA-256 hashes
• changed JSON files parse successfully and git diff --check passes

Local limitations: go test -race -count=1 ./... could not run on this Windows host because GCC is unavailable. The broader non-race runs retain unrelated failures in untouched Windows path, host-cache, and timing tests; the affected packages, build, vet, lint, and type checks above passed. A post-fix Docker-backed OTLP/ClickHouse rerun is not claimed because the local Docker engine was unavailable.

Checklist

• PR title follows Conventional Commit format.
• I have reviewed the contributing guidelines
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Acknowledgment

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of the project license.