fix(sdk): drop dead @mysten/walrus import from /manual (WALM-145)

[HoangDucBach]

Ticket

WALM-145 — https://linear.app/mysten-labs/issue/WALM-145
GH #330 — #330

What changed?

• Removed unused getWalrusClient(), _walrusClient, and walrusUpload() from MemWalManual.
• No remaining import("@mysten/walrus") in the SDK. Blob download stays on HTTP fetch to the aggregator.
• Docs no longer claim /manual uploads/downloads via @mysten/walrus.

Why is this needed?

The live remember path uploads through the relayer. The live recall path downloads over HTTP. getWalrusClient() still did await import("@mysten/walrus") with no call sites, so Next.js 15 Turbopack put Walrus WASM in the /manual module graph and hit /ROOT/ resolution errors.

Test plan

• SDK tests, including packages/sdk/test/no-walrus-wasm.test.mjs
• Import @mysten-incubation/memwal/manual under Turbopack/Vite without @mysten/walrus
• recallManual still downloads blobs over HTTP

[ducnmm]

Summary

WALM-145 is correctly implemented: getWalrusClient(), _walrusClient, and unused walrusUpload() are gone, SDK source has no @mysten/walrus specifier, and recallManual still downloads through HTTP walrusDownload. Version dump is right — unpublished 0.1.7 on dev vs 0.1.6 on main, so no bump; the new Fixed bullet sits under existing ## 0.1.7 in both changelogs.

Issue counts by severity

• bugs: 0
• suggestions: 2
• nits: 1

Issues outside the diff

• [nit] packages/sdk/src/manual.ts:23 — The file header now says remember uploads through the relayer, but the @example still says remember is “all client-side: embed → SEAL encrypt → Walrus upload → register”. That contradicts rememberManual. Change the example to the hybrid flow (embed → SEAL encrypt → relayer upload).

[ducnmm]

Summary

Follow-up e6031c98 closed the prior comments: optional @mysten/walrus peer and install docs, dead walrusEpochs / walrusPublisherUrl, and the @example upload wording. WALM-145 itself is still correct.

Issue counts by severity

• bugs: 1
• suggestions: 0
• nits: 0

CI JS jobs fail pnpm install --frozen-lockfile because pnpm-lock.yaml still lists @mysten/walrus under packages/sdk.

Lockfile updated on 5354052 — packages/sdk no longer lists @mysten/walrus. No remaining issues.

[ducnmm]

LGTM, cleans up dead @mysten/walrus imports and adds verifying unit tests.