Update: make wasmtime deps optional behind a wasm feature (on by default)

[0xLeif]

Summary

• wasmtime and wasmtime-wasi were unconditional dependencies (~36 transitive crates) purely for the optional sandboxed WASM plugin runtime. Marked both optional = true and added a [features] block with default = ["wasm"] and wasm = ["dep:wasmtime", "dep:wasmtime-wasi"]. Default behavior is unchanged; --no-default-features drops the entire wasmtime dependency tree.
• Cfg-gated every wasm code path on feature = "wasm":
  • mod wasm; in src/plugin/mod.rs
  • the WASM run-time dispatch in src/plugin/run_plugin.rs
  • the WASM pre-compile step in src/plugin/install.rs
• For the disabled path, both the run and install sites now bail! with a clear error: "Plugin '<name>' requires the WASM runtime, which was not compiled in (rebuild with --features wasm)."
• Gated the protocol re-exports (detect_project_context, handle_exec, handle_metadata, handle_load, handle_store, handle_log) that exist solely for the wasm host bridge, so the no-default-features build stays warning-free (they are the only external consumers).

Test Plan

• cargo build (default, wasm ON) — clean
• cargo build --no-default-features — clean, warning-free
• cargo tree -i wasmtime: present with default features, absent with --no-default-features
• cargo test --bin fledge (default) — 897 passed, 0 failed
• cargo clippy --bin fledge -- -D warnings — clean (also verified with --no-default-features)
• cargo fmt --check — clean

🤖 Generated with Claude Code

Closes #445

https://claude.ai/code/session_016AvsKakjAc3EKN2ztcMfYi

[gemini-code-assist]

Code Review

This pull request makes the WASM plugin runtime optional by introducing a new wasm feature flag. It updates Cargo.toml to make wasmtime and wasmtime-wasi optional dependencies, gates WASM-related installation, execution, and module declarations behind #[cfg(feature = "wasm")], and ensures that appropriate errors are returned if a WASM plugin is invoked when the feature is disabled. Additionally, unused re-exports are gated to prevent compiler warnings. I have no further feedback to provide.

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[0xGaspar]

Clean feature-gating. The cfg split is consistent across all three surfaces — the wasm module, both run/install dispatch sites, and the protocol host-bridge re-exports (gated to keep the no-default-features build warning-free) — and the disabled path bail!s with an actionable message instead of silently degrading. default = ["wasm"] keeps current behavior; the dependency-tree win is opt-in via --no-default-features, which is the right default. cargo tree -i wasmtime present/absent both ways is the proof that matters. LGTM.

[github-actions]

✅ Corvin says...

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"Looking sharp! Like a beak should be."

CI Summary

Check	Status
Dependency Audit	✅ Passed
Integration (3 OS)	✅ Passed
Lint (fmt + clippy)	✅ Passed
Spec Validation	✅ Passed
Tests (3 OS)	✅ Passed

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