feat: Add strict trace continuation support

[giortzisg]

Summary

• Extract org ID from DSN host (e.g., o123.ingest.sentry.io → "123")
• Add strictTraceContinuation (boolean, default false) and orgId (String) options to SentryOptions
• Propagate sentry-org_id in baggage / Dynamic Sampling Context
• Validate incoming traces per the decision matrix (mismatched org → new trace; strict mode rejects missing org)

Decision Matrix

Baggage org	SDK org	strict=false	strict=true
1	1	Continue	Continue
None	1	Continue	New trace
1	None	Continue	New trace
None	None	Continue	Continue
1	2	New trace	New trace

Changes

• Dsn.java — org ID extraction from host using ^o(\d+)\. regex
• SentryOptions.java — strictTraceContinuation, orgId, and getEffectiveOrgId()
• Baggage.java — ORG_ID DSCKey, getter/setter, population in setValuesFromTransaction/setValuesFromScope/fromEvent
• PropagationContext.java — shouldContinueTrace() logic in fromHeaders()
• Scopes.java — pass options to fromHeaders()

Test plan

• DSN org ID extraction tests (5 cases)
• PropagationContext decision matrix tests (10 cases)

Closes #5128

🤖 Generated with Claude Code

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Semver Impact of This PR

🟡 Minor (new features)

📋 Changelog Preview

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New Features ✨

• (otel) Create sentry-opentelemetry-otlp module for combining OpenTelemetry SDK OTLP export with Sentry SDK by adinauer in #5100
• (screenshot) Add screenshot masking using view hierarchy by romtsn in #5077

• Add strict trace continuation support by giortzisg in #5136

Bug Fixes 🐛

• (transport) Handle HTTP 413 with actionable log and use send_error for HTTP errors by adinauer in #5115
• Trim DSN string before URI parsing by adinauer in #5113
• Safe unregister SystemEventsBroadcastReceiver by kollesnica1337 in #5106

Internal Changes 🔧

Deps

• Bump getsentry/craft from 2.21.7 to 2.23.1 by dependabot in #5129
• Update Native SDK to v0.13.1 by github-actions in #5104
• Bump actions/upload-artifact from 6 to 7 by dependabot in #5130
• Bump actions/download-artifact from 7 to 8 by dependabot in #5132
• Bump gradle/actions from 5.0.1 to 5.0.2 by dependabot in #5131
• Bump github/codeql-action from 4.32.2 to 4.32.4 by dependabot in #5109
• Bump getsentry/craft from 2.21.2 to 2.21.7 by dependabot in #5110

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	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

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Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	348.85 ms	428.10 ms	79.25 ms
Size	1.58 MiB	2.29 MiB	723.70 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
91bb874	310.68 ms	359.24 ms	48.56 ms
e59e22a	368.02 ms	432.00 ms	63.98 ms
fc5ccaf	279.11 ms	353.34 ms	74.23 ms
d15471f	315.20 ms	370.22 ms	55.02 ms
d15471f	286.65 ms	314.68 ms	28.03 ms
d15471f	342.08 ms	415.44 ms	73.35 ms
ad8da22	314.38 ms	352.29 ms	37.91 ms
cf708bd	434.73 ms	502.96 ms	68.22 ms
abfcc92	309.54 ms	380.32 ms	70.78 ms
91bb874	314.47 ms	440.00 ms	125.53 ms

App size

Revision	Plain	With Sentry	Diff
91bb874	1.58 MiB	2.13 MiB	559.07 KiB
e59e22a	1.58 MiB	2.20 MiB	635.34 KiB
fc5ccaf	1.58 MiB	2.13 MiB	557.54 KiB
d15471f	1.58 MiB	2.13 MiB	559.54 KiB
d15471f	1.58 MiB	2.13 MiB	559.54 KiB
d15471f	1.58 MiB	2.13 MiB	559.54 KiB
ad8da22	1.58 MiB	2.29 MiB	719.83 KiB
cf708bd	1.58 MiB	2.11 MiB	539.71 KiB
abfcc92	1.58 MiB	2.13 MiB	557.31 KiB
91bb874	1.58 MiB	2.13 MiB	559.07 KiB