docs: how an agent funds Walrus storage (WAL or sponsored) [BEDU-602]

[reemsabawi-mystenlabs]

Description

Adds a developer guide on how an autonomous agent funds Walrus storage: holding WAL directly versus sponsored storage (BEDU-602, Stage A / storage resource & payment).
New page (docs/fundamentals/architecture/funding-storage.md)

• Explains that a Walrus write consumes 2 tokens, WAL for storage and SUI for gas, so "sponsored" is ambiguous until you say which half is covered.
• Covers Model A (agent holds WAL directly): CLI and TS SDK, acquiring WAL, ownership of the Blob object, and lifecycle/expiry responsibilities.
• Covers Model B (sponsored): publisher (pays WAL and SUI; send-object-to for ownership; no public Mainnet publisher), Sui sponsored transactions (gas only), pre-funding via transferable WAL or storage resources, the upload-relay-is-not-a-sponsor clarification, and protocol subsidies (network-level, not per-agent).
• Maps the models to Walrus Memory: public relayer as sponsored, self-hosting as self-funded.
• Adds a decision table and an operational checklist; added to the Fundamentals > Architecture sidebar group.
  Grounded in existing docs (Walrus system-overview/storage-costs, network-reference, operator-guide/upload-relay, TypeScript SDK) and MemWal how-storage-works. Written to the Sui documentation style guide.

Test plan

• Local docs preview (mint dev in docs/) renders the page with working <Note>/<Warning> components and the decision table.
• The page appears under Fundamentals > Architecture in the sidebar.
• Internal links to how-storage-works, public-relayer, and self-hosting resolve.

Release notes

Docs-only change; no user-facing storage node, aggregator, publisher, or CLI impact.

• Storage node:
• Aggregator:
• Publisher:
• CLI:

[jessiemongeon1]

Style Guide Audit

Audited 2 file(s) against the Sui Documentation Style Guide.

1 violation(s) found. All must be fixed before merge.

docs/fundamentals/architecture/funding-storage.md (1 violation(s))

1 violation(s) (1 regex, 0 claude)

• Line 1 — Frontmatter needs keywords
  • Current: (missing or placeholder)
  • Fix: Add relevant keywords

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Automated audit using the Sui Documentation Style Guide.