Rename crates and add EdgeZero workspace dependencies #482

Description

Rename crates/common → crates/trusted-server-core and crates/fastly → crates/trusted-server-adapter-fastly following EdgeZero naming convention. Add EdgeZero workspace dependencies.

http crate version compatibility

Both fastly = "0.11.12" and EdgeZero use http 1.x. No version conflict expected — verify during dependency resolution and note in PR description. (Previously flagged as a risk; downgraded to verification item.)

Done when

• All per-PR gates pass (cargo build --workspace, cargo build --package trusted-server-adapter-fastly --target wasm32-wasip1, cargo test --workspace, cargo clippy --workspace --all-targets --all-features -- -D warnings, cargo fmt --all -- --check)
• cargo doc builds
• CLAUDE.md updated with new crate names and paths
• http crate version compatibility verified

Blocked by

None (first task)

References

• docs/internal/EDGEZERO_MIGRATION.md — Phase 0: Foundation
• Part of EdgeZero Integration #480