✨ Add sveltekit router integration

[amortemousque]

Summary

Auto-generated router integration for sveltekit using the router integration pipeline.

• Router view tracking via startView() on route changes
• Unit tests for view name computation and navigation filtering

Design Artifacts

Full design trail at docs/integrations/sveltekit/:

• 01-router-concepts.json — structured routing concepts extracted from framework docs
• 02-design-decisions.json — hook selection, wrapping strategy, algorithm family decisions
• 03-generation-manifest.md — list of generated files with lineage

Key Decisions

• Hook: afterNavigate — only post-cancellation/post-redirect SvelteKit hook that fires uniformly on initial mount (type: 'enter') and subsequent client navigations; onNavigate excludes the initial load so would drop the first RUM view, and page-state reactive hooks require $effect diffing with no timing benefit.
• Wrapping strategy: renderless component (<DatadogRumRouter />) — afterNavigate has no imperative API and must run during Svelte component init; SvelteKit's file-based routing offers no createRouter factory to wrap, so a renderless component placed in root +layout.svelte is the idiomatic attach point (matches how View Transitions and analytics libs wire in).
• View-name algorithm: route-id family — navigation.to.route.id already is the collapsed parameterized pattern (e.g. /blog/[slug], /(app)/dashboard); computeViewName is a one-liner that falls back to url.pathname when route.id is null (unmatched/404) and preserves bracket syntax / route groups / matchers verbatim.
• Reference implementation: rum-vue — closest match on plugin shape (top-level factory + router: boolean + onRumInit queue), subscription pattern (single event-based post-redirect hook, router.afterEach ↔ afterNavigate), and view-name algorithm (pure-function computeViewName split from subscription site); the wrapping surface differs but the RUM-facing side transfers directly.

Test plan

• Review design artifacts in docs/integrations/sveltekit/
• Review generated code against reference implementations
• Run yarn typecheck to verify type correctness
• Run yarn test:unit --spec packages/rum-sveltekit/ to verify tests pass
• Manual review of computeViewName() edge cases

🤖 Generated with the router integration pipeline

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	177.94 KiB	177.94 KiB	0 B	0.00%	✅
Rum Profiler	6.16 KiB	6.16 KiB	0 B	0.00%	✅
Rum Recorder	27.03 KiB	27.03 KiB	0 B	0.00%	✅
Logs	56.40 KiB	56.40 KiB	0 B	0.00%	✅
Rum Slim	133.81 KiB	133.81 KiB	0 B	0.00%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base CPU Time (ms)	Local CPU Time (ms)	𝚫%
RUM - add global context	0.0085	0.0044	-48.24%
RUM - add action	0.0264	0.0143	-45.83%
RUM - add error	0.0247	0.0136	-44.94%
RUM - add timing	0.0053	0.004	-24.53%
RUM - start view	0.0233	0.0131	-43.78%
RUM - start/stop session replay recording	0.0014	0.001	-28.57%
Logs - log message	0.0306	0.0186	-39.22%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	25.97 KiB	27.77 KiB	+1.80 KiB
RUM - add action	98.72 KiB	100.26 KiB	+1.54 KiB
RUM - add timing	26.43 KiB	27.04 KiB	+628 B
RUM - add error	85.28 KiB	90.61 KiB	+5.34 KiB
RUM - start/stop session replay recording	26.30 KiB	26.01 KiB	-300 B
RUM - start view	486.03 KiB	482.55 KiB	-3.48 KiB
Logs - log message	92.85 KiB	98.19 KiB	+5.35 KiB

🔗 RealWorld

[datadog-official]

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 77.78%
• Overall Coverage: 77.60% (+0.57%)

_{This comment will be updated automatically if new data arrives.
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