feat(skills): Add span streaming migration skill for JavaScript

AGENTS.md

@@ -50,6 +50,7 @@ Skills use YAML frontmatter with `allowed-tools` — this is required by Cursor
 |-------|-------------|
 | `sentry-setup-ai-monitoring` | Instrument OpenAI/Anthropic/Vercel AI/LangChain/Google GenAI |
 | `sentry-otel-exporter-setup` | Setup OTel Collector with Sentry Exporter |
+| `sentry-span-streaming` | Migrate from transaction-based to streamed span delivery |
 
 ### Workflow Skills
 | Skill | Description |

SKILL_TREE.md

@@ -111,6 +111,7 @@ Configure specific Sentry capabilities beyond basic SDK setup.
 | Create Sentry alerts using the workflow engine API | [`sentry-create-alert`](skills/sentry-create-alert/SKILL.md) | `sentry-create-alert/SKILL.md` |
 | Configure the OpenTelemetry Collector with Sentry Exporter for multi-project routing and automatic project creation | [`sentry-otel-exporter-setup`](skills/sentry-otel-exporter-setup/SKILL.md) | `sentry-otel-exporter-setup/SKILL.md` |
 | Setup Sentry AI Agent Monitoring in any project | [`sentry-setup-ai-monitoring`](skills/sentry-setup-ai-monitoring/SKILL.md) | `sentry-setup-ai-monitoring/SKILL.md` |
+| Migrate to Sentry span streaming (span-first trace lifecycle) | [`sentry-span-streaming`](skills/sentry-span-streaming/SKILL.md) | `sentry-span-streaming/SKILL.md` |
 
 ## Quick Lookup
 

skills/sentry-feature-setup/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: sentry-feature-setup
-description: Configure specific Sentry features beyond basic SDK setup. Use when asked to monitor AI/LLM calls, set up OpenTelemetry pipelines, or create alerts and notifications.
+description: Configure specific Sentry features beyond basic SDK setup. Use when asked to monitor AI/LLM calls, set up OpenTelemetry pipelines, create alerts and notifications, or enable span streaming.
 license: Apache-2.0
 role: router
 ---
@@ -26,6 +26,7 @@ Append the path from the `Path` column in the table below to `https://skills.sen
 1. If the user mentions **AI monitoring, LLM tracing, or instrumenting an AI SDK** (OpenAI, Anthropic, LangChain, Vercel AI, Google GenAI, Pydantic AI) → `sentry-setup-ai-monitoring`
 2. If the user mentions **OpenTelemetry, OTel Collector, or multi-service telemetry routing** → `sentry-otel-exporter-setup`
 3. If the user mentions **alerts, notifications, on-call, Slack/PagerDuty/Discord integration, or workflow rules** → `sentry-create-alert`
+4. If the user mentions **span streaming, traceLifecycle, spanStreamingIntegration, or switching from transactions to streamed spans** → `sentry-span-streaming`
 
 When unclear, **ask the user** which feature they want to configure. Do not guess.
 
@@ -38,6 +39,7 @@ When unclear, **ask the user** which feature they want to configure. Do not gues
 | AI/LLM monitoring — instrument OpenAI, Anthropic, LangChain, Vercel AI, Google GenAI, Pydantic AI | [`sentry-setup-ai-monitoring`](../sentry-setup-ai-monitoring/SKILL.md) | `sentry-setup-ai-monitoring/SKILL.md` |
 | OpenTelemetry Collector with Sentry Exporter — multi-project routing, automatic project creation | [`sentry-otel-exporter-setup`](../sentry-otel-exporter-setup/SKILL.md) | `sentry-otel-exporter-setup/SKILL.md` |
 | Alerts via workflow engine API — email, Slack, PagerDuty, Discord | [`sentry-create-alert`](../sentry-create-alert/SKILL.md) | `sentry-create-alert/SKILL.md` |
+| Span streaming — migrate from transaction-based to streamed span delivery | [`sentry-span-streaming`](../sentry-span-streaming/SKILL.md) | `sentry-span-streaming/SKILL.md` |
 
 Each skill contains its own detection logic, prerequisites, and step-by-step instructions. Trust the skill — read it carefully and follow it. Do not improvise or take shortcuts.