BunProfile: SHA3, X25519, markdown.ansi, rapidhash; disable WebView

[dylan-conway]

Summary

Adds fuzz coverage for Bun APIs that landed recently and aren't yet exercised by the profile.

• SHA3: add sha3-224/256/384/512 to the CryptoHasher algorithm pool, and add a new BunSubtleCryptoGenerator that calls crypto.subtle.digest("SHA3-256/384/512", …) (Update BoringSSL, add SHA3 to WebCrypto and node:crypto bun#29323).
• X25519: same generator also exercises crypto.subtle.generateKey({name:"X25519"}) → deriveBits (Implement X25519 deriveBits in SubtleCrypto bun#29152).
• Bun.markdown.ansi: the markdown generator now picks between html and ansi, and ansi is registered on the Bun.markdown builtin (Add markdown ANSI pretty-printer for bun ./file.md bun#28833).
• Bun.hash.rapidhash: registered as a builtin (was missing).
• Bun.WebView: set to undefined in codePrefix so mutated samples can't spawn browser processes mid-fuzz, same treatment as Bun.FFI (Bun.WebView — headless browser automation (WebKit + Chrome backends) bun#28185).

These changes are independent of #8 (which covers Bun.cron, sliceAnsi, etc.) and apply cleanly on top of it with one trivial conflict in the Bun.markdown method list.

Test plan

• swift build passes with no new warnings

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: f4638c98-6539-4306-b515-fd7ad71d335c

📥 Commits

Reviewing files that changed from the base of the PR and between 3c5428b and 83b057f.

📒 Files selected for processing (1)

• Tests/FuzzilliTests/EnvironmentTest.swift

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Walkthrough

Added SHA3 algorithms and a rapidhash builtin, introduced a new BunSubtleCryptoGenerator exercising crypto.subtle, expanded Bun.markdown to include ansi, disabled Bun.WebView in bootstrap, and removed one experimental flag from a test invocation.

Changes

Cohort / File(s)	Summary
Bun profile — crypto, hash, markdown, bootstrap Sources/Fuzzilli/Profiles/BunProfile.swift	Added SHA3 algorithms to hashing inputs and ILType.hashAlgorithmEnum; added Bun.hash.rapidhash builtin; added public BunSubtleCryptoGenerator (uses subtle.digest + X25519 deriveBits); updated BunMarkdownGenerator to call markdown.html or markdown.ansi; registered new generator; disabled Bun.WebView in fuzzing bootstrap.
Test invocation flag change Tests/FuzzilliTests/EnvironmentTest.swift	Removed --experimental-wasm-rab-integration from testJSEnvironmentLive() executor flags; other flags unchanged.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and concisely summarizes all five main changes in the PR: SHA3 algorithms, X25519 key derivation, markdown.ansi support, rapidhash builtin, and WebView disabling.
Description check	✅ Passed	The description is well-organized and directly related to the changeset, providing context for each change with references to specific Bun issues and explaining the rationale behind each modification.

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