chore: switch dcosl-core to crates.io dependency

Replace local path dependency with crates.io v0.1.0 since both resolve
to the same published version.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: matthiasdebernardini

Cargo.lock

@@ -13,7 +13,7 @@ keywords = ["nostr", "decentralized", "cli", "agent", "dcosl"]
 categories = ["command-line-utilities"]
 
 [dependencies]
-dcosl-core = { path = "../dcosl-core" }
+dcosl-core = "0.1.0"
 nostr-sdk = "0.44"
 agcli = { version = "0.6", features = ["jemalloc"] }
 tokio = { version = "1", features = ["rt-multi-thread", "macros", "time"] }