Add runner OTEL telemetry options

[jmcte]

Summary

• add a shared OTEL telemetry config schema and renderer for runner environments
• wire optional telemetry settings into Synology, Linux Docker, Windows Docker, and Lume runners
• document configurable remote OTLP targets and add non-secret env/config examples

Verification

• pnpm lint
• pnpm exec vitest run test/config.test.ts test/compose.test.ts test/linux-docker-compose.test.ts test/windows-compose.test.ts test/lume-config.test.ts test/lume-config.snapshot.test.ts
• bash scripts/ci/run-fast-checks.sh
• pnpm validate-config -- --config config/pools.yaml --env .env.example
• pnpm validate-linux-docker-config -- --config config/linux-docker-runners.yaml --env .env.example
• pnpm validate-windows-config -- --config config/windows-runners.yaml --env .env.example
• pnpm validate-lume-config -- --config config/lume-runners.yaml --env .env.example

[chatgpt-codex-connector]

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[pheidon]

Reviewed the PR diff and validation surface. The telemetry schema is opt-in, requires an endpoint when enabled, and the rendered OTEL environment is consistently wired across Synology, Linux Docker, Windows Docker, and Lume runners without committing secret header values. The added coverage exercises enabled telemetry rendering, endpoint validation, runner-version current-state handling, and env parser edge cases.\n\nVerification run locally on the PR worktree:\n- corepack pnpm lint ✅\n- targeted vitest suite for config/compose/lume/windows/linux/env/runner-version ✅\n- bash scripts/ci/run-fast-checks.sh ✅\n- validate-config / validate-linux-docker-config / validate-windows-config / validate-lume-config against examples ✅\n- full corepack pnpm test -- --run: 45 files, 204 tests passed ✅\n\nNo blocking findings from this pass.