fix: remove path dep from airframe (use crates.io only in CI)

- Remove path = "../airframe" from Cargo.toml — CI checks out only
  shimmy repo, so ../airframe path never exists in CI builds
- Keep version = "0.2.8" to resolve from crates.io
- Regenerate Cargo.lock with airframe as registry (not path) dep
- Airframe 0.2.8 published to crates.io with isf feature and
  airframe-observe dependency properly configured

Author: Michael-A-Kuykendall

Cargo.lock

@@ -68,7 +68,7 @@ dirs = "5.0"
 reqwest = { version = "0.12", features = ["json", "rustls-tls", "stream"], default-features = false }
 
 # Airframe native GPU inference — public crate on crates.io
-airframe = { path = "../airframe", version = "0.2.8", optional = true, features = ["isf"] }
+airframe = { version = "0.2.8", optional = true, features = ["isf"] }
 
 [dev-dependencies]
 tokio-tungstenite = "0.20"