fix: use pallet-revive's keyless pallet account as the read-only query origin

[UtkarshBhardwaj007]

What

Switch the defaultOrigin used for read-only registry queries (playground mod browse + metadata-uri lookup, registry username reads) from Alice's dev SS58 to pallet-revive's own keyless pallet account:

PalletId(*b"py/reviv").into_account_truncating()
= "modlpy/reviv" + 20 zero bytes
= 5EYCAe5ijiYfhaAUBd6H9WGRTsvwFFc7GnhQkiHvBYxdvpbV

Why

paritytech/product-sdk#152 replaced the SDK's Alice query-fallback origin with this account: it is semantically meaningful, not tied to a dev seed, and always exists on chain. That fallback never reaches us, though, because the CLI always passes an explicit defaultOrigin, so our reads kept dry-running as Alice. This aligns the CLI with the SDK's choice.

How

• QUERY_FALLBACK_ORIGIN is not exported from @parity/product-sdk-contracts, so the 3-line derivation is mirrored in src/utils/registry.ts (verified byte-for-byte against the installed 0.7.0 dist).
• We keep passing the origin explicitly rather than relying on the SDK fallback: the fallback path emits a log.warn per query that would leak into the Ink TUI.
• registry.test.ts drops the ss58Encode/getDevPublicKey mocks and freezes the real SS58, so a regression back to Alice (or anything else) fails loudly.
• Updated the stale Alice comments in src/commands/mod/index.ts and the CLAUDE.md playground mod invariant; added a patch changeset.

Test

• pnpm format:check, pnpm lint:license, pnpm test (579/579), pnpm build all pass.
• Live smoke: playground mod definitely-not-a-real-app.dot resolves the registry via the CDM meta-registry and the get_app dry-run returns the correct "not found in registry" with the new origin.

Follow-up idea (not in this PR): ask product-sdk to export QUERY_FALLBACK_ORIGIN so consumers can import it instead of mirroring the derivation.

[github-actions]

E2E Test Pass · ✅ PASS

Tag: e2e-ci-pr · Branch: fix/read-only-query-origin-revive-pallet-account · Commit: 6619f0f · Run logs

Cell	Result	Time
pr-mod	✅ PASS	1m25s
pr-deploy-foundry	✅ PASS	0m42s
pr-install	✅ PASS	0m45s
pr-preflight	✅ PASS	2m20s
pr-deploy-frontend	✅ PASS	15m32s
pr-deploy-cdm	✅ PASS	5m48s
pr-init-session	✅ PASS	1m57s
${{ matrix.cell }}	⏭️ SKIP	0m-1s
${{ matrix.cell }}	⏭️ SKIP	0m-1s

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