refactor(fspy): also gate ipc channel module out on android

[branchseer]

Summary

Extend the not(target_env = "musl") gate on fspy_shared::ipc::channel (and all downstream ChannelConf/channel() references) to also exclude target_os = "android". On both musl and android, the preload library's IPC channel is unavailable, so the shared-memory channel module has no purpose there.

• fspy_shared::ipc::channel module gated on all(not(target_os = "android"), not(target_env = "musl"))
• fspy::ipc module (which re-exports OwnedReceiverLockGuard and SHM_CAPACITY) similarly gated
• fspy::unix::SpyImpl::spawn channel creation, Payload::ipc_channel_conf field init, ipc_receiver_lock_guard creation and field, PathAccessIterable::iter() branch — all updated
• Payload::ipc_channel_conf field and ChannelConf import in fspy_shared_unix::payload — updated

Preload-library gates (preload_path, NativeStr import, PRELOAD_CDYLIB_BINARY, fspy_preload_unix) are left untouched — they remain musl-only for this PR.

Test plan

• cargo check --workspace --all-features --all-targets --locked on host (glibc)
• cargo check --workspace --all-features --target x86_64-unknown-linux-musl
• cargo clippy --workspace --all-targets --all-features -- -D warnings
• cargo fmt --check
• RUSTDOCFLAGS='-D warnings' cargo doc --no-deps --document-private-items
• cargo test -p fspy --test node_fs (exercises full spawn + IPC pipeline, 8 pass)

https://claude.ai/code/session_01VqiMHiGeViu1pGhWwJ67Qc

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Gate preload IPC references on Android

Excluding fspy_shared::ipc::channel for Android here leaves downstream Android builds with unresolved symbols: fspy_preload_unix still imports channel::Sender and accesses encoded_payload.payload.ipc_channel_conf unconditionally (crates/fspy_preload_unix/src/client/mod.rs, lines 11 and 48). On target_os="android" + non-musl, this commit removes the module/field definitions but does not gate or replace those call sites, so compiling the preload crate fails.

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