fix: remove runtime Ed25519 casing adapter

[GsCommand]

Motivation

• runtime-core now emits and verifies metadata.proof.signature.alg = "Ed25519" so the runtime-side lowercase adapter is no longer needed.
• Keep verification canonicalization and signing delegated to @commandlayer/runtime-core to avoid layer blurring.

Description

• Updated @commandlayer/runtime-core dependency ref to 8fcebeff72898ac1e3482f2d608b14769675f5e8 in package.json and package-lock.json.
• Removed the runtime-side adapter that mutated metadata.proof.signature.alg from Ed25519 to ed25519 and now pass receipts unchanged to verifyCommandLayerReceipt(...) with allowedCanonicals: [runtimeConfig.canonicalMethod].
• Confirmed the runtime still imports and uses CANONICAL_METHOD, signCommandLayerReceipt, and verifyCommandLayerReceipt, and did not reintroduce legacy helpers like CANONICAL_ID_SORTED_KEYS_V1, signReceiptEd25519Sha256, verifyReceiptEd25519Sha256, or local canonical/hash helpers.
• Files changed: package.json, package-lock.json, and server.mjs (commit f1bb3c6).

Testing

• Ran npm install which failed in this environment due to network/DNS resolution when fetching the git dependency from GitHub.
• Ran npm run check which succeeded (node --check server.mjs).
• Ran npm test which executed unit tests and smoke tests and resulted in 3 failing tests related to /verify behavior after removing the adapter: /verify accepts both wrapped and bare receipts from the production signing path, /verify?ens=1 passes with mocked ENS TXT response and preserves current kid behavior, and full chain clean -> summarize -> classify verifies with schema using commons execution defaults.
• Ran npm run ci which also failed because it runs the same test suite that produced the 3 failing tests.

---

Codex Task