DEV-950 Add partial transaction signing guide

[catmcgee]

Summary

• add a core guide for freezing a transaction message and collecting signatures independently
• cover fee payer coordination, signature verification and merging, offline signing, and transaction lifetime
• include a type checked example that demonstrates mutation invalidating existing signatures

[vercel]

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Project	Deployment	Actions	Updated (UTC)
solana-com-docs	Ready	Preview	Aug 27, 2026 11:00pm

5 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
solana-com	Skipped		Aug 27, 2026 11:00pm
solana-com-accelerate	Skipped		Aug 27, 2026 11:00pm
solana-com-breakpoint-2	Skipped		Aug 27, 2026 11:00pm
solana-com-media	Skipped		Aug 27, 2026 11:00pm
templates	Skipped		Aug 27, 2026 11:00pm

[vercel]

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[greptile-apps]

Greptile Summary

The PR adds a canonical partial-signing guide and executable legacy TypeScript example, redirects the former offline-transactions material to it, and adds Surfpool-backed runtime coverage.

• Documents immutable message construction, independent signature collection, verification, lifetime handling, and submission.
• Adds the guide to core transaction navigation and updates cookbook navigation.
• Adds a runnable transaction example and test.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
apps/docs/content/docs/en/core/transactions/partial-signing.mdx	Adds the canonical partial-signing guide and embeds the executable example.
packages/docs-examples/cookbook/transactions/partial-signing/legacy.ts	Implements independent signing, signature verification and merging, submission, and a message-mutation demonstration.
packages/docs-examples/cookbook/transactions/partial-signing/legacy.test.ts	Adds Surfpool-backed execution and successful-transaction validation for the example.
apps/docs/content/cookbook/transactions/offline-transactions.mdx	Replaces the former cookbook content with a link to the canonical guide.

_{Reviews (3): Last reviewed commit: "docs: consolidate partial signing guidan..." | Re-trigger Greptile}

[catmcgee]

consolidated into #1995