docs(readme): align with shell-chain v0.23.0 — drop pq1/Bech32m, document 32-byte 0x addresses, flag signing-hash drift

[LucienSong]

Background

shell-chain v0.23.0 uses a clean-slate address model: 0x + 64 lowercase hex (full 32-byte BLAKE3 hash of algo_id || pubkey). No Bech32m, no version byte, no [0:20] truncation. The README still contained many pq1…, Bech32m, [0..20], and version_byte(0x01) references from a prior design.

Changes

• Architecture overview → addresses: rewritten to describe the 32-byte 0x+64-hex model; explicitly states there is no Bech32m encoding
• Address module reference: updated constants (SHELL_ADDRESS_LENGTH=32) and function table (bytesToShellAddress, shellAddressToBytes, normalizeShellAddress, deriveShellAddressFromPublicKey, isShellAddress); legacy pq1…-named aliases noted as deprecated
• All pq1… examples in code snippets replaced with 0x…
• System contract table updated to 32-byte big-endian form
• Chain reference table: address format updated
• Dependency table: removed @scure/base (bech32m no longer needed for addresses)
• Error handling table: updated error messages
• Top-level v0.23.0 alignment notice added, explicitly flagging that hashTransaction / hashBatchTransaction still implement the pre-v0.23.0 keccak256(RLP(tx)) scheme and will be replaced in a follow-up PR with BLAKE3 structured preimage + sig_type, and that tests/fixtures/rust-compatibility.json will be regenerated at that time

Impact

Documentation only — no source code changes, no fixture regeneration.

Deferred (tracked)

• hashTransaction(tx, sigType) / hashBatchTransaction rewrite to BLAKE3 + domain byte 0x7E
• hashPaymasterAuthorization addition (domain byte 0x7F)
• BATCH_SIGNING_HASH_DOMAIN 0x42 → 0x7E
• tests/fixtures/rust-compatibility.json regeneration against v0.23.0 node

[Copilot]

Pull request overview

This PR updates README.md to align the SDK documentation with shell-chain v0.23.0’s clean-slate changes (32-byte 0x addresses, updated address derivation narrative, and removal of Bech32m/pq1 examples), while explicitly warning that the transaction signing-hash helpers are not yet v0.23.0-compatible.

Changes:

• Added a v0.23.0 alignment status banner and updated address-format explanations/examples to 32-byte 0x hex.
• Updated the module reference to document new Shell address helpers and note deprecated legacy aliases.
• Replaced pq1…/bech32m references throughout the README with 0x… examples and removed bech32m dependency references.

Comments suppressed due to low confidence (2)

README.md:742

• The “Common error messages” table doesn’t match the current address helpers:

• bytesToShellAddress throws expected 32 address bytes, got N (not 20).
• normalizeShellAddress / shellAddressToBytes throw expected a 0x + 64-char hex address, got: "…" rather than the listed expected 0x prefix… / invalid Shell address length.
  Please update the table to reflect the actual error strings (or avoid claiming exact message text).

| Error message | Cause |
|---|---|
| `expected 20 address bytes, got N` | Wrong-length bytes passed to address helpers |
| `expected 0x prefix, got X` | Shell address must start with `0x` |
| `invalid Shell address length` | Address must be 32 raw bytes / 64 hex characters |
| `unsupported key type: X` | Keystore `key_type` not recognised |

README.md:773

• In the TypeScript types reference, SignatureTypeName is missing the canonical "ML-DSA-65" variant that is included in the real type (src/types.ts). Update the README snippet so it matches the exported SignatureTypeName union.

// Any value accepted as a Shell address (0x… 64-char hex)
type AddressLike = string;

// Post-quantum signature algorithm names
type SignatureTypeName = "Dilithium3" | "MlDsa65" | "SphincsSha2256f";

---

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[LucienSong]

All three review comments addressed in 4f8fe06:

1. Table malformed (line 136) — collapsed to a clean 2-column Name/Address table with full 32-byte literal addresses.

2. Error message mismatch (lines 206, 737) — updated normalizeShellAddress example to show the actual thrown message: expected 0x + 64-char hex address, got: "pq1abc…".

3. System-contracts exports (line 485) — removed the non-existent validatorRegistryHexAddress/accountManagerHexAddress entries; table now shows only the actual exports (validatorRegistryAddress / accountManagerAddress) with full 32-byte canonical values; isSystemContractAddress example updated to use a 32-byte address.

Also fixed a stale error message in the error-handling table: expected 20 address bytes → expected 32 address bytes to match address.ts:37.

[LucienSong]

CI fixed — all 48 tests now pass (commit 60f4cd6).

Root causes and fixes:

• Keystore fixture address fields were stale Bech32m pq1 addresses → replaced with BLAKE3-derived 32-byte 0x hex addresses
• Test assertions used startsWith('pq1') → updated to startsWith('0x')
• aa.test.mjs had hardcoded pq1q802m0h0m…/pq1qx46h2at4w… addresses → replaced with zero-padded 32-byte hex equivalents
• node.integration.test.mjs tampered-address test: slice(0, -2) + one char produced a 63-char address (caught by format validator, not address-mismatch guard) → fixed to swap last single char so the tampered address stays valid-format but wrong value
• rust-compatibility.json: pq_address fields updated to 32-byte hex; stale 20-byte hex_address fields removed; transaction to/access_list.address updated; hash_hex vectors recomputed with updated addresses