feat(sdk): DotNS registry reads + writes in identity

[TarikGul]

Description:
Implements the DotNS registry surface in @parity/product-sdk/identity, replacing the exported-but-throwing resolveDotNs / reverseDotNs / isDotNsAvailable stubs. DotNS is an ENS-style set of Revive contracts on Paseo Asset Hub, reached via @parity/product-sdk-contracts.

Reads

• resolveDotNs(name) — namehash → registry.resolver(node) →
  resolver.addressOf(node) (+ registry.owner(node)). Returns
  Result<DotNsRecord | null, DotNsError>; ok(null) when unregistered.
• reverseDotNs(account) — reverseResolver.nameOf(account).
• isDotNsAvailable(name).

Writes

Return prepared BatchableCalls the caller submits with their own signe (surface stays signer-free, like the reads):

• setDotNsRecord — resolver.setAddress.
• prepareDotNsRegistration — the commit-reveal flow: returns { secret, commitCall, registerCall, minCommitmentAge, maxCommitmentAge, price }. Register's payable value is PopRules.price(label). Registration is two txs separated by a mandatory wait, so it can't be one submittable.

Also

• namehash / DOT_NODE exported (DotNS-specific, rooted at the .dot node).
• DotNsError (SdkError, source: "dotns").
• Contract addresses default to the Paseo AH deployment, all overridable.

Notes

• Breaking: the old stubs took no options and threw; the new signatures require DotNsClientOptions and return a Result. Pre-1.0, so minor.
• DotNsRecord.expiresAt is omitted — this deployment has no on-chain expiry.
• The on-chain viem round-trip is validated against a live/forked Asset Hub, not unit-tested in-package (would duplicate the contracts harness); in-package tests cover validation + the error model.
• TODO(dotns-addr): a teammate cited a StoreFactory address that differs from the deployment manifest — confirm the live deployment. (Off the resolution path, so it doesn't affect reads/writes.)

[github-actions]

📦 Bundle size impact

Comparing 2026-08-11T17:46:19.213Z → 2026-08-11T17:46:20.243Z

	Package	Entry	Bundled before	Bundled after	Δ	Ship gzip Δ	Shake ratio
🟢	@parity/product-sdk	.	6.33 MB	6.33 MB	-8 B (-0.0%)	0 B	0% (was 0%)
🟢	@parity/product-sdk	./core	6.33 MB	6.33 MB	-8 B (-0.0%)	0 B	0% (was 0%)
🔴	@parity/product-sdk	./identity	57.6 KB	105.7 KB	+48.1 KB (+83.5%)	+2.3 KB	33% (was 60%)
🟢	@parity/product-sdk	./react	6.34 MB	6.34 MB	-8 B (-0.0%)	-2 B	0% (was 0%)

Thresholds — warn: ≥10% or ≥5.0 KB · fail: ≥20% or ≥15.0 KB (bundled). Percentage only applies once the baseline is ≥ 10 KB.