feat(telemetry)!: promote to v1.0.0 — named shutdown errors per provider, Go 1.26

Label each provider shutdown failure with its signal name (trace/metric/log).
Errors remain joined via errors.Join; individual causes still unwrappable.
Go directive bumped from 1.25 to 1.26. API committed as stable.

RELEASE.md

@@ -0,0 +1,46 @@
+# v1.0.0
+
+> `code.nochebuena.dev/go/telemetry`
+
+## Overview
+
+`telemetry` bootstraps the full OpenTelemetry SDK with OTLP gRPC exporters targeting
+a Grafana Alloy collector. A single call to `New` sets all three OTel global providers
+(traces → Tempo, metrics → Mimir, logs → Loki) and returns a shutdown function the
+caller defers in `main`.
+
+v1.0.0 adds named per-provider shutdown errors, bumps the Go directive to 1.26, and
+commits the API as stable. No micro-lib dependencies are added.
+
+## What Changed Since v0.9.0
+
+### Named per-provider shutdown errors
+
+The shutdown function now labels each provider failure individually:
+
+```
+telemetry: trace provider shutdown: <cause>
+telemetry: metric provider shutdown: <cause>
+telemetry: log provider shutdown: <cause>
+```
+
+Errors are still joined with `errors.Join`; individual causes remain accessible via
+`errors.As`. Previously, provider shutdown failures were joined without labels, making
+it impossible to identify which signal pipeline failed.
+
+### Go directive bumped to 1.26
+
+## Full API (stable)
+
+- `Config` — `ServiceName`, `ServiceVersion`, `Environment`, `OTLPEndpoint`, `OTLPInsecure`
+- `New(ctx, cfg) (func(context.Context) error, error)`
+
+## Installation
+
+```
+go get code.nochebuena.dev/go/telemetry@v1.0.0
+```
+
+## Changelog
+
+See [CHANGELOG.md](CHANGELOG.md#100---2026-05-12).