…10.65

The docs tracesSampler classifies traffic (AI agent / bot / user) to sample
accordingly and emit the docs.trace.sampled metric, but @sentry/core did not
pass normalizedRequest into the sampling context for root spans until 10.63.0
(getsentry/sentry-javascript#21833). On the previous 10.55.0 that field was
always undefined, so all traffic fell through to "unknown": AI-agent traces
were under-sampled, bot noise wasn't filtered, and the metric couldn't segment
traffic.

- Bump @sentry/nextjs and @sentry/browser to 10.65.0 (within the existing ^10
  range); consolidates the previously split @sentry/core versions.
- Consolidate classification into a single user-agent-based classifyFromHeaders,
  used by both the tracesSampler and a new span attribute.
- Tag every root span with docs.traffic_type so classification is queryable on
  spans, which flush from every environment (the metric only flushes reliably
  under sustained production traffic).
- Remove the middleware x-traffic-type/x-device-type request-header injection and
  the sampler's header-classification path: the injected headers never reached
  the sampler (middleware transactions sample off the incoming request; route
  handlers carry no normalized request), so that machinery was dead.

Co-Authored-By: Claude <noreply@anthropic.com>

Fixes docs traffic classification. The tracesSampler reads
samplingContext.normalizedRequest to classify traffic (AI agent / bot / user)
and sample accordingly, but @sentry/core did not populate normalizedRequest in
the sampling context for root spans until 10.63.0
(getsentry/sentry-javascript#21833). On the previous 10.55.0 that field was
always undefined, so all traffic was classified "unknown": agent traces
under-sampled, bots not filtered, and docs.trace.sampled unable to segment.

No code changes needed — the existing sampler works once the SDK populates the
field. Also consolidates the previously split @sentry/core versions onto 10.65.

Co-Authored-By: Claude <noreply@anthropic.com>

## DESCRIBE YOUR PR

Bumps `@sentry/nextjs` and `@sentry/browser` to `10.65.0` (within the
existing `^10` range) to fix docs traffic classification, which was
silently broken.

`src/tracesSampler.ts` reads `samplingContext.normalizedRequest` to
classify traffic as AI agent / bot / user and sample accordingly (agents
100%, bots 0%, users 30%), emitting the `docs.trace.sampled` metric. But
`@sentry/core` did not populate `normalizedRequest` in the sampling
context for root spans until **10.63.0**
([getsentry/sentry-javascript#21833](getsentry/sentry-javascript#21833)).
On the resolved `10.55.0` that field was always `undefined`, so all
traffic was classified `unknown`: agent traces were under-sampled, bot
noise wasn't filtered, and the metric couldn't segment traffic.

**No code changes** — the existing sampler works as designed once the
SDK populates the field. Verified on a preview deploy that `10.65.0`
populates the sampler's `normalizedRequest` (with the user-agent) on the
real Vercel runtime; the metric will show the correct
`ai_agent`/`bot`/`user` breakdown in production once deployed.

- Bump `@sentry/nextjs` + `@sentry/browser` to `^10.65.0`
- Consolidates the previously split `@sentry/core` versions onto
`10.65.0`

## IS YOUR CHANGE URGENT?

Help us prioritize incoming PRs by letting us know when the change needs
to go live.
- [ ] Urgent deadline (GA date, etc.): <!-- ENTER DATE HERE -->
- [ ] Other deadline: <!-- ENTER DATE HERE -->
- [x] None: Not urgent, can wait up to 1 week+

## SLA

- Teamwork makes the dream work, so please add a reviewer to your PRs.
- Please give the docs team up to 1 week to review your PR unless you've
added an urgent due date to it.
Thanks in advance for your help!

## PRE-MERGE CHECKLIST

*Make sure you've checked the following before merging your changes:*

- [ ] Checked Vercel preview for correctness, including links
- [ ] PR was reviewed and approved by any necessary SMEs (subject matter
experts)
- [ ] PR was reviewed and approved by a member of the [Sentry docs
team](https://github.com/orgs/getsentry/teams/docs)

Co-authored-by: Claude <noreply@anthropic.com>