docs: document initializerless accounts

[AztecBot]

Initializerless accounts shipped with the v5 line but were never actually documented: the only coverage was a migration-notes entry, an external link on the aztec-nr immutables page, and rc.2 tutorial snippets that call createSchnorrInitializerlessAccount without explaining it. The main "Creating Accounts" guide still teaches only the paid deploy-tx flow.

What this adds

New concept page: foundational-topics/accounts/deployment.md ("Account Deployment")

• The standard initialize-and-deploy flow vs the initializerless flow
• How the mechanism works: signing key committed into the address via immutables_hash, utility constructor materializing the key in the PXE, entrypoint proving the local key matches the address commitment
• Trade-offs: no deploy cost/delay; signing key fixed forever; per-PXE local setup still needed; getDeployMethod() throws
• Pointers to the Aztec.js API, aztec-wallet create-account -t schnorr_initializerless, and the aztec-nr immutables pattern

How-to: new "Create an initializerless account" section in aztec-js/how_to_create_account.md, placed before the deploy section, with the createSchnorrInitializerlessAccount snippet and the key caveats. The deploy section intro now clarifies it applies to createSchnorrAccount accounts.

Cross-links from fees.md (payment methods), wallets.md (account setup), contract_creation.md (immutables_hash field), and aztec-nr/framework-description/immutables.md.

All changes are mirrored into developer_versioned_docs/version-v5.0.0-rc.2/ so the live testnet docs pick them up immediately (that snapshot is what testnet users read today).

Why the snippet is a fenced code block, not #include_code

The docs TS examples type-check against this branch's yarn-project, and createSchnorrInitializerlessAccount only exists on the v5 line (introduced in #23962), not on next. An #include_code example in docs/examples/ts/ would therefore fail examples/bootstrap.sh validation on this branch. The snippet matches the verified v5.0.0-rc.2 API; it should be converted to an #include_code example once the v5 line lands in next.

Verification

• yarn spellcheck: clean (497 files, 0 issues; initializerless is already in docs-words.txt)
• yarn build: full site build succeeds; the new page renders in both the dev and testnet (v5.0.0-rc.2) doc instances and all new internal links resolve (remaining broken-anchor warnings are pre-existing in the CLI reference)
• Migration notes and the auto-generated CLI reference were deliberately left untouched (published migration entries are immutable; the CLI reference is generated)

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Created by claudebox · group: slackbot