feat(stream-e): invoke wire — kei-runtime subprocess → real atoms
Replace NotImplemented stub with real atom execution per schema
§Runtime invocation contract.
Convention: JSON-in/JSON-out over subprocess. Every refactored crate
exposes `<crate> run-atom <verb>` that reads JSON from stdin (or
--input), dispatches to atoms::<verb>::run, emits Output JSON on
stdout, exits per atom-error class.
Runtime side (kei-runtime):
- InvokeError: +AtomFailed{atom,code,stderr} +SubprocessError
+OutputParse +BinaryNotFound{crate_name}. NotImplemented kept as
legacy escape for atoms opting out of run-atom protocol.
- Output: now {atom: String, result: Value} — carries atom's actual
return value.
- invoke_exit_code: AtomFailed passes through child exit (0..=255),
Subprocess/OutputParse → 1, BinaryNotFound → 127, NotImplemented → 64.
- Binary resolution: KEI_RUNTIME_BIN_DIR env → PATH fallback.
kei-task side:
- New `pub mod run_atom` in lib.rs
- atoms/mod.rs: VERBS const + DispatchError enum wrapping per-atom errors
- src/run_atom.rs: read_input (stdin/@path/literal), dispatch, exit mapping
- main.rs: Cmd::RunAtom{verb, input} subcommand; collapsed three
classify_*_error helpers into single classify_dispatch. Legacy
create/search/add-dependency CLIs preserved.
Tests: 5/5 runtime (+1 invoke_real_atom integration), 9/9 kei-task
(+1 atoms::tests::verbs_list_matches_submodules).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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