feat: Add dependency sync entries

Summary

• Add fabrik deps sync [name] backed by declarative [[deps]] entries in fabrik.toml.
• Add dependency graph sync support for Rust, Swift, Go, and Elixir.
• Add inline external dependency edges in target deps, where strings stay local target deps and inline tables like { cargo = "serde" } point at a named dependency graph.
• Lower Rust external dependency edges to generated vendor/<deps-name>/<crate> targets and write Rust generated declarations under vendor/<deps-name>/fabrik.toml.
• Rebase on the new granular Elixir target work and document dependency sync in each target guide.
• Add docs sidebar icons for Rust, Swift, Go, Elixir, and Tasks.
• Add shellspec coverage for deps sync across the supported ecosystems.
• Run non-Windows cargo CI steps through mise exec --, move stable Cargo/Rust env defaults into mise.toml, and expose the pinned Rust bin dir to shellspec temp workspaces.

Impact

This moves dependency sync configuration into fabrik.toml and gives build targets one dependency list. Local target dependencies stay as strings, while external ecosystem dependencies use inline tables keyed by the named [[deps]] graph. fabrik vendor remains as a hidden alias for compatibility.

Validation

• mise exec -- cargo fmt --all -- --check
• mise exec -- cargo test --workspace
• mise exec -- cargo clippy --workspace --all-targets -- -D warnings
• mise exec -- cargo build --release
• mise exec -- shellspec
• npm run build in docs/
• mise exec -- env | rg '^(CARGO_TERM_COLOR|CARGO_INCREMENTAL|CARGO_PROFILE_DEV_DEBUG|CARGO_PROFILE_TEST_DEBUG|RUST_BACKTRACE)='

The full shellspec run passed with 100 examples, 0 failures, and 2 skips. The skipped examples are the iOS simulator launch case because no simulator is booted locally, and the Go deps sync e2e case because this local environment does not have a go binary.

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