feat(agentcompany-rust): scaffold native shell and runtime bridge

AgentCompany-Rust/crates/support/src/lib.rs

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+pub mod paths;
+pub mod time;

AgentCompany-Rust/crates/support/src/paths.rs

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+use anyhow::{Result, anyhow};
+use std::{
+    env, fs,
+    path::{Path, PathBuf},
+};
+
+pub const APP_NAME: &str = "AgentCompany";
+pub const PROFILE_ENV: &str = "AGENTCOMPANY_PROFILE_DIR";
+
+pub fn default_profile_dir() -> Result<PathBuf> {
+    dirs::data_dir()
+        .map(|path| path.join(APP_NAME).join("profile"))
+        .ok_or_else(|| anyhow!("OS data directory is unavailable"))
+}
+
+pub fn resolve_profile_dir() -> Result<PathBuf> {
+    match env::var(PROFILE_ENV) {
+        Ok(value) if !value.trim().is_empty() => Ok(PathBuf::from(value)),
+        _ => default_profile_dir(),
+    }
+}
+
+pub fn profile_db_path(profile_dir: &Path) -> PathBuf {
+    profile_dir.join("profile.sqlite")
+}
+
+pub fn ensure_profile_dir(profile_dir: &Path) -> Result<()> {
+    fs::create_dir_all(profile_dir)?;
+    Ok(())
+}

AgentCompany-Rust/crates/support/src/time.rs

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+use anyhow::{Context, Result};
+use time::{OffsetDateTime, format_description::well_known::Rfc3339};
+
+pub fn now_iso() -> Result<String> {
+    OffsetDateTime::now_utc()
+        .format(&Rfc3339)
+        .context("failed to format UTC timestamp")
+}