fix: repoint two 404 external links in builder docs

[pucedoteth]

Two links in docs/ return 404. Both verified with curl before and after, per the URL rule in CLAUDE.md.

1. Foundry scripting guide

docs/builder/get-started/your-first-smart-contract/deploy.md:42

404  https://getfoundry.sh/guides/scripting-with-solidity
200  https://getfoundry.sh/forge/scripting

Foundry moved the page. Their own llms.txt lists the current one:

- [Scripting](/forge/scripting): Deploy and interact with contracts using Forge scripts.

which matches what the sentence is pointing at ("executable Rust binaries that handle all your contract interactions"). https://getfoundry.sh/guides/ itself is still 200, so only the leaf moved.

2. React SDK README

docs/builder/tools/clients/react-sdk/account-state-and-balances.md:25

404  https://github.com/0xMiden/miden-client/blob/v0.15.0/packages/react-sdk/README.md
200  https://github.com/0xMiden/web-sdk/blob/v0.15.9/packages/react-sdk/README.md

The tag v0.15.0 does exist on miden-client, but there is no packages/ directory in that repo — not at that tag, and not on its default branch. The React SDK lives in web-sdk:

• @miden-sdk/react on npm (latest 0.15.9, matching this docs line) declares repository: git+https://github.com/0xMiden/web-sdk.git
• 0xMiden/web-sdk/packages/react-sdk/README.md exists and is 56 KB

Pinned to v0.15.9 — the latest 0.15.x tag, preserving the original intent to pin rather than track a moving branch. v0.15.0 is not a tag on web-sdk (its tags start at v0.15.4). Link text updated from miden-client/... to web-sdk/... so it still names the file it points at.

Notes

• npm run build does not complete on a bare clone. It fails in sidebars.ts with These sidebar document ids do not exist: for builder/tools/bridging/*, builder/tools/clients/rust-client/* and friends — the docs that deploy-docs.yml ingests from external repos before building. I confirmed the failure is identical on untouched main, so it is pre-existing and not from this change. Both edits here are external absolute URLs, which Docusaurus's onBrokenLinks does not check, so they cannot affect the build either way. Flagging it in case a documented local-build path (or an ingest script) would be worth having.
• versioned_docs/ left untouched. The same two links appear in the snapshots (version-0.11 through version-0.15). Those are generated by the cut-versions workflow, so fixing docs/ is what makes future cuts correct; happy to update the snapshots too if you'd rather they were consistent.
• While checking, I noticed three links using pre-rename repo names that GitHub still redirects — 0xMiden/miden-tutorials → tutorials, 0xMiden/miden-node/discussions → node/discussions, and 0xMiden/miden-client/issues → rust-sdk/issues. They all resolve today so I left them out of this PR, but the last one in particular suggests the same repo-reorg drift as fix Consolidated Miden docs in this repo #2. Say the word and I'll fold them in.

[pucedoteth]

Rebased onto current main — this was conflicting and is now down to a single file.

The Foundry scripting link this branch also repointed has since been fixed upstream (https://www.getfoundry.sh/forge/scripting), so I dropped that hunk rather than fight the conflict over an already-fixed line.

The remaining fix is still needed — the React SDK moved out of miden-client into web-sdk:

404  https://github.com/0xMiden/miden-client/blob/v0.15.0/packages/react-sdk/README.md
200  https://github.com/0xMiden/web-sdk/blob/v0.15.9/packages/react-sdk/README.md

(verified just now with curl -o /dev/null -w '%{http_code}' -L)