refactor(agent): extract claude driver into hive-claude crate

hive-claude/src/config.rs

@@ -0,0 +1,58 @@
+//! Invocation config: how to build one `claude --print` command line.
+
+use std::path::PathBuf;
+
+/// Which claude session a run should attach to. Kept separate from [`Config`]
+/// so a single config can drive resume + create + `/compact` of the same
+/// logical session across turns.
+#[derive(Debug, Clone)]
+pub enum Session {
+    /// `--resume <id-or-title>` — resume an existing session by UUID or by the
+    /// display title set via [`Session::Create`]. Yields
+    /// [`crate::Outcome::SessionNotFound`] if nothing matches.
+    Resume(String),
+    /// `--name <title>` — start a new session carrying the given display title
+    /// (persisted as a `custom-title` event, which `--resume <title>` later
+    /// resolves against).
+    Create(String),
+    /// `--continue` — resume the most recent session in the cwd. Ambiguous
+    /// when other claude processes share the cwd; prefer titled sessions.
+    Continue,
+    /// No session flag — a one-off, unnamed session.
+    OneOff,
+}
+
+/// Everything needed to build one headless `claude --print` invocation, minus
+/// the [`Session`] attachment (passed separately to [`crate::run`]).
+///
+/// Fields map one-to-one to CLI flags; `None`/empty means "don't pass the
+/// flag". `--print --verbose --output-format stream-json` are always set by
+/// the driver and are not configurable here (the driver depends on the
+/// stream-json shape).
+#[derive(Debug, Clone, Default)]
+pub struct Config {
+    /// `--model`. Empty omits the flag (claude falls back to its own default).
+    pub model: String,
+    /// `--effort <level>`. `None` omits the flag.
+    pub effort: Option<String>,
+    /// Working directory for the child. Claude derives its per-project session
+    /// dir from this path. `None` inherits the parent process cwd.
+    pub cwd: Option<PathBuf>,
+    /// `--system-prompt-file <path>`.
+    pub system_prompt_file: Option<PathBuf>,
+    /// `--mcp-config <path>`.
+    pub mcp_config: Option<PathBuf>,
+    /// Pass `--strict-mcp-config` (only the configured MCP servers, no
+    /// discovery).
+    pub strict_mcp_config: bool,
+    /// `--tools <expr>` — the built-in tool allow-list expression.
+    pub tools: Option<String>,
+    /// `--allowedTools <expr>`.
+    pub allowed_tools: Option<String>,
+    /// `--add-dir <path>` (repeatable) — extra readable directories.
+    pub add_dirs: Vec<PathBuf>,
+    /// Any additional raw args appended verbatim after the ones above.
+    pub extra_args: Vec<String>,
+    /// Program to spawn. `None` defaults to `claude` (resolved on `PATH`).
+    pub program: Option<String>,
+}