Align receipt canonicalization/status and remove legacy ENS verify shim

[GsCommand]

Motivation

• Remove a fragile legacy ENS helper that defaulted to the wrong TXT key and could mislead consumers, per the fix-or-delete decision.
• Ensure current-line receipt canonicalization is deterministic and consistent by using the shared json.sorted_keys.v1 routine.
• Make runtime types and emitted receipts consistent by standardizing the status enum to the runtime value "success".
• Track the lockfile to stabilize installs and keep published artifacts reproducible.

Description

• Deleted the legacy ENS verify shim (src/ens.verify.ts) and removed its export from src/index.ts so the malformed default TXT key is not shipped.
• Replaced the inline recursive sorter in canonicalizeReceipt with a call to canonicalizeSortedKeysV1 by importing it in src/receipt.ts to unify canonicalization logic.
• Changed the ReceiptStatus type in src/types.ts from "ok" | "error" to "success" | "error" and updated tests and README examples to use "success".
• Added package-lock.json, removed it from .gitignore, and rebuilt distribution artifacts under dist/ so the package output remains consistent for publishing.

Testing

• Ran npm install successfully to populate dependencies.
• Ran the full test script with npm test (which runs tsc as part of the pipeline) and all automated tests passed.
• TypeScript build succeeds as part of the test run and the test-suite is green.

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Codex Task