refactor(core): extract application core into jcode-app-core crate (Phase A)

Move all non-presentation modules (113 modules / ~191K loc) out of the
monolithic root crate into a new physical crate, jcode-app-core, compiled
as a separate rustc unit. The root jcode crate becomes a thin facade
(pub use jcode_app_core::*) plus the presentation/entrypoint layer
(cli, tui, video_export, main).

Rationale: rustc type-checks a whole crate as one unit, so peak per-rustc
RSS is bounded by the largest crate. Splitting the 336K-loc root crate into
separate rustc processes is what actually lowers peak memory (the prior
SCC/DAG layering work was the prerequisite that made this a clean cut, since
no core module references crate::cli or crate::tui).

Measured: largest unit peak rustc VmHWM 3.18 GiB -> 2.643 GiB (app-core).
Further reductions come from sub-splitting app-core (Phase B) and extracting
jcode-tui (Phase C).

Mechanics:
- New crate crates/jcode-app-core (deps mirror root with paths rewritten;
  features default/jemalloc/jemalloc-prof/embeddings/pdf forwarded from root).
- git mv of 417 files preserving history; lib.rs aggregates pub mod decls
  and the moved CURRENT_SESSION_ID/get/set_current_session items.
- Promote cross-boundary items referenced by cli/tui from pub(crate) to pub
  (process_title, external_auth, provider selection/openrouter, server +
  session lifecycle re-exports, openai_request re-exports).
- Fix two escape-path includes now one dir deeper (macOS icns, openai test
  fixture) and import_tests ResumeTarget direct path.

Build: cargo check/build -p jcode --bin jcode exit 0.

Cargo.lock

@@ -3296,6 +3296,7 @@ dependencies = [
  "image",
  "jcode-agent-runtime",
  "jcode-ambient-types",
+ "jcode-app-core",
  "jcode-auth-types",
  "jcode-azure-auth",
  "jcode-background-types",
@@ -3392,6 +3393,116 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "jcode-app-core"
+version = "0.1.0"
+dependencies = [
+ "agentgrep",
+ "anyhow",
+ "arboard",
+ "async-trait",
+ "aws-config",
+ "aws-credential-types",
+ "aws-sdk-bedrock",
+ "aws-sdk-bedrockruntime",
+ "aws-sdk-sts",
+ "aws-smithy-types",
+ "aws-types",
+ "base64 0.22.1",
+ "bytes",
+ "chrono",
+ "clap",
+ "crossterm",
+ "dirs",
+ "flate2",
+ "futures",
+ "glob",
+ "global-hotkey",
+ "hex",
+ "ignore",
+ "image",
+ "jcode-agent-runtime",
+ "jcode-ambient-types",
+ "jcode-auth-types",
+ "jcode-azure-auth",
+ "jcode-background-types",
+ "jcode-batch-types",
+ "jcode-build-meta",
+ "jcode-build-support",
+ "jcode-compaction-core",
+ "jcode-config-types",
+ "jcode-core",
+ "jcode-embedding",
+ "jcode-gateway-types",
+ "jcode-import-core",
+ "jcode-logging",
+ "jcode-memory-types",
+ "jcode-message-types",
+ "jcode-notify-email",
+ "jcode-overnight-core",
+ "jcode-pdf",
+ "jcode-plan",
+ "jcode-protocol",
+ "jcode-provider-core",
+ "jcode-provider-gemini",
+ "jcode-provider-metadata",
+ "jcode-provider-openai",
+ "jcode-provider-openrouter",
+ "jcode-selfdev-types",
+ "jcode-session-types",
+ "jcode-side-panel-types",
+ "jcode-storage",
+ "jcode-swarm-core",
+ "jcode-task-types",
+ "jcode-terminal-image",
+ "jcode-terminal-launch",
+ "jcode-tool-core",
+ "jcode-tool-types",
+ "jcode-tui-account-picker",
+ "jcode-tui-core",
+ "jcode-tui-markdown",
+ "jcode-tui-mermaid",
+ "jcode-tui-messages",
+ "jcode-tui-render",
+ "jcode-tui-session-picker",
+ "jcode-tui-style",
+ "jcode-tui-tool-display",
+ "jcode-tui-usage-overlay",
+ "jcode-tui-workspace",
+ "jcode-update-core",
+ "jcode-usage-types",
+ "libc",
+ "open",
+ "proctitle",
+ "qrcode",
+ "rand 0.9.3",
+ "ratatui",
+ "regex",
+ "reqwest",
+ "rustls 0.23.37",
+ "serde",
+ "serde_json",
+ "serde_yaml",
+ "sha2 0.10.9",
+ "similar",
+ "tar",
+ "tempfile",
+ "thiserror 1.0.69",
+ "tikv-jemalloc-ctl",
+ "tikv-jemalloc-sys",
+ "tikv-jemallocator",
+ "tokio",
+ "tokio-stream",
+ "tokio-tungstenite",
+ "toml",
+ "unicode-width 0.2.0",
+ "url",
+ "urlencoding",
+ "uuid",
+ "walkdir",
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "jcode-auth-types"
 version = "0.1.0"

Cargo.toml

@@ -194,6 +194,11 @@ jcode-background-types = { path = "crates/jcode-background-types" }
 jcode-batch-types = { path = "crates/jcode-batch-types" }
 jcode-build-support = { path = "crates/jcode-build-support" }
 jcode-build-meta = { path = "crates/jcode-build-meta" }
+# Application core: all non-presentation modules, compiled as a separate rustc
+# unit. The root crate (cli + tui + bin) re-exports it via `pub use
+# jcode_app_core::*`. default-features=false so the root feature set fully
+# controls app-core's features (see [features]).
+jcode-app-core = { path = "crates/jcode-app-core", default-features = false }
 jcode-compaction-core = { path = "crates/jcode-compaction-core" }
 jcode-config-types = { path = "crates/jcode-config-types" }
 jcode-core = { path = "crates/jcode-core" }
@@ -238,15 +243,17 @@ jemalloc = [
     "dep:tikv-jemalloc-sys",
     "tikv-jemallocator/stats",
     "tikv-jemalloc-ctl/stats",
+    "jcode-app-core/jemalloc",
 ]
 jemalloc-prof = [
     "jemalloc",
     "tikv-jemallocator/profiling",
     "tikv-jemalloc-ctl/profiling",
+    "jcode-app-core/jemalloc-prof",
 ]
-embeddings = ["dep:jcode-embedding"]
+embeddings = ["dep:jcode-embedding", "jcode-app-core/embeddings"]
 mmdr-size-api = ["jcode-tui-mermaid/mmdr-size-api"]
-pdf = ["dep:jcode-pdf"]
+pdf = ["dep:jcode-pdf", "jcode-app-core/pdf"]
 
 [target.'cfg(windows)'.dependencies]
 windows-sys = { version = "0.59", features = ["Win32_Foundation", "Win32_System_Threading"] }

crates/jcode-app-core/Cargo.toml

@@ -0,0 +1,169 @@
+[package]
+name = "jcode-app-core"
+version = "0.1.0"
+edition = "2024"
+publish = false
+
+# Application core for jcode: all non-presentation modules (server, agent,
+# provider, auth, session, tool, config, etc.) extracted out of the monolithic
+# root `jcode` crate so they compile as a separate rustc unit. The root `jcode`
+# crate (cli + tui + bin) re-exports this crate's modules via `pub use
+# jcode_app_core::*`, preserving every existing `crate::<module>` path.
+
+[lib]
+name = "jcode_app_core"
+path = "src/lib.rs"
+
+[dependencies]
+# Memory allocator (reduces fragmentation for long-running server)
+tikv-jemallocator = { version = "0.6", features = ["unprefixed_malloc_on_supported_platforms"], optional = true }
+tikv-jemalloc-ctl = { version = "0.6", optional = true }
+tikv-jemalloc-sys = { version = "0.6", optional = true }
+
+# Async runtime
+tokio = { version = "1", features = ["fs", "io-std", "io-util", "macros", "net", "process", "rt-multi-thread", "signal", "sync", "time"] }
+futures = "0.3"
+async-trait = "0.1"
+
+# HTTP client
+reqwest = { version = "0.12", features = ["json", "stream", "blocking"] }
+rustls = { version = "0.23", default-features = false, features = ["aws_lc_rs"] }
+tokio-tungstenite = { version = "0.24", default-features = false, features = ["connect", "rustls-tls-native-roots"] }
+
+# Serialization
+serde = { version = "1", features = ["derive"] }
+serde_json = { version = "1", features = ["raw_value"] }
+serde_yaml = "0.9"
+toml = "0.8"
+
+# CLI
+clap = { version = "4", features = ["derive"] }
+
+# File operations
+glob = "0.3"
+ignore = "0.4"           # gitignore-aware file walking
+walkdir = "2"
+similar = "2"            # diffing for edits
+
+# Utilities
+dirs = "5"               # home directory
+anyhow = "1"
+thiserror = "1"
+libc = "0.2"             # Unix system calls (flock)
+chrono = { version = "0.4", features = ["serde"] }
+regex = "1"
+urlencoding = "2"        # URL encoding for web search
+uuid = { version = "1", features = ["v4", "v5"] }
+proctitle = "0.1"
+
+# Embeddings (local inference) - behind feature flag (163 crates, slow to compile)
+jcode-embedding = { path = "../jcode-embedding", optional = true }
+jcode-gateway-types = { path = "../jcode-gateway-types" }
+jcode-import-core = { path = "../jcode-import-core" }
+jcode-logging = { path = "../jcode-logging" }
+
+# OAuth
+base64 = "0.22"
+sha2 = "0.10"
+rand = "0.9.3"
+hex = "0.4"
+url = "2"
+open = "5"               # Open URLs in browser
+jcode-auth-types = { path = "../jcode-auth-types" }
+jcode-azure-auth = { path = "../jcode-azure-auth" }
+jcode-agent-runtime = { path = "../jcode-agent-runtime" }
+jcode-ambient-types = { path = "../jcode-ambient-types" }
+jcode-notify-email = { path = "../jcode-notify-email" }
+jcode-provider-metadata = { path = "../jcode-provider-metadata" }
+jcode-provider-core = { path = "../jcode-provider-core" }
+jcode-provider-openai = { path = "../jcode-provider-openai" }
+jcode-provider-openrouter = { path = "../jcode-provider-openrouter" }
+jcode-provider-gemini = { path = "../jcode-provider-gemini" }
+jcode-tui-markdown = { path = "../jcode-tui-markdown" }
+jcode-tui-messages = { path = "../jcode-tui-messages" }
+jcode-tui-core = { path = "../jcode-tui-core" }
+jcode-tui-mermaid = { path = "../jcode-tui-mermaid" }
+jcode-tui-account-picker = { path = "../jcode-tui-account-picker" }
+jcode-tui-render = { path = "../jcode-tui-render" }
+jcode-tui-session-picker = { path = "../jcode-tui-session-picker", features = ["serde"] }
+jcode-tui-style = { path = "../jcode-tui-style" }
+jcode-tui-tool-display = { path = "../jcode-tui-tool-display" }
+jcode-tui-usage-overlay = { path = "../jcode-tui-usage-overlay" }
+jcode-update-core = { path = "../jcode-update-core" }
+jcode-terminal-launch = { path = "../jcode-terminal-launch" }
+jcode-terminal-image = { path = "../jcode-terminal-image" }
+jcode-tui-workspace = { path = "../jcode-tui-workspace" }
+jcode-usage-types = { path = "../jcode-usage-types" }
+
+# Streaming
+tokio-stream = "0.1"
+bytes = "1"
+
+# TUI
+ratatui = "0.30"
+crossterm = { version = "0.29", features = ["event-stream"] }
+arboard = "3"              # Clipboard support
+image = { version = "0.25", default-features = false, features = ["png", "jpeg"] }  # Only PNG/JPEG (skip avif/rav1e, exr, gif, tiff, etc)
+
+# Markdown & syntax highlighting
+unicode-width = "0.2"   # Unicode character display width
+
+# PDF parsing (behind feature flag)
+jcode-pdf = { path = "../jcode-pdf", optional = true }
+jcode-background-types = { path = "../jcode-background-types" }
+jcode-batch-types = { path = "../jcode-batch-types" }
+jcode-build-support = { path = "../jcode-build-support" }
+jcode-build-meta = { path = "../jcode-build-meta" }
+jcode-compaction-core = { path = "../jcode-compaction-core" }
+jcode-config-types = { path = "../jcode-config-types" }
+jcode-core = { path = "../jcode-core" }
+jcode-memory-types = { path = "../jcode-memory-types" }
+jcode-message-types = { path = "../jcode-message-types" }
+jcode-overnight-core = { path = "../jcode-overnight-core" }
+jcode-plan = { path = "../jcode-plan" }
+jcode-swarm-core = { path = "../jcode-swarm-core" }
+jcode-protocol = { path = "../jcode-protocol" }
+jcode-selfdev-types = { path = "../jcode-selfdev-types" }
+jcode-session-types = { path = "../jcode-session-types" }
+jcode-storage = { path = "../jcode-storage" }
+jcode-task-types = { path = "../jcode-task-types" }
+jcode-tool-core = { path = "../jcode-tool-core" }
+jcode-tool-types = { path = "../jcode-tool-types" }
+jcode-side-panel-types = { path = "../jcode-side-panel-types" }
+
+# Archive extraction (for auto-update)
+flate2 = "1"
+tar = "0.4"
+tempfile = "3"
+agentgrep = { git = "https://github.com/1jehuang/agentgrep.git", tag = "v0.1.2" }
+qrcode = { version = "0.14.1", default-features = false }
+aws-config = "1.8.16"
+aws-credential-types = "1.2.14"
+aws-sdk-bedrockruntime = "1.130.0"
+aws-types = "1.3.15"
+aws-smithy-types = "1.4.7"
+aws-sdk-bedrock = "1.141.0"
+aws-sdk-sts = "1.103.0"
+
+[features]
+default = ["pdf", "embeddings"]
+jemalloc = [
+    "dep:tikv-jemallocator",
+    "dep:tikv-jemalloc-ctl",
+    "dep:tikv-jemalloc-sys",
+    "tikv-jemallocator/stats",
+    "tikv-jemalloc-ctl/stats",
+]
+jemalloc-prof = [
+    "jemalloc",
+    "tikv-jemallocator/profiling",
+    "tikv-jemalloc-ctl/profiling",
+]
+embeddings = ["dep:jcode-embedding"]
+pdf = ["dep:jcode-pdf"]
+
+[target.'cfg(windows)'.dependencies]
+windows-sys = { version = "0.59", features = ["Win32_Foundation", "Win32_System_Threading"] }
+
+[target.'cfg(target_os = "macos")'.dependencies]
+global-hotkey = "0.7"

crates/jcode-app-core/src/external_auth.rs

@@ -12,13 +12,13 @@ use std::io::{self, IsTerminal, Write};
 
 use crate::auth;
 
-pub(crate) fn can_prompt_for_external_auth() -> bool {
+pub fn can_prompt_for_external_auth() -> bool {
     std::io::stdin().is_terminal()
         && std::io::stderr().is_terminal()
         && std::env::var("JCODE_NON_INTERACTIVE").is_err()
 }
 
-pub(crate) fn external_auth_blocked_message(
+pub fn external_auth_blocked_message(
     provider_name: &str,
     source_name: &str,
     path: &std::path::Path,
@@ -33,7 +33,7 @@ pub(crate) fn external_auth_blocked_message(
     )
 }
 
-pub(crate) fn prompt_to_trust_external_auth(
+pub fn prompt_to_trust_external_auth(
     provider_name: &str,
     source_name: &str,
     path: &std::path::Path,
@@ -69,7 +69,7 @@ enum ExternalAuthReviewAction {
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]
-pub(crate) struct ExternalAuthReviewCandidate {
+pub struct ExternalAuthReviewCandidate {
     pub(crate) provider_summary: String,
     pub(crate) source_name: String,
     pub(crate) path: std::path::PathBuf,
@@ -77,13 +77,13 @@ pub(crate) struct ExternalAuthReviewCandidate {
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]
-pub(crate) struct ExternalAuthAutoImportOutcome {
+pub struct ExternalAuthAutoImportOutcome {
     pub imported: usize,
     pub messages: Vec<String>,
 }
 
 impl ExternalAuthAutoImportOutcome {
-    pub(crate) fn render_markdown(&self) -> String {
+    pub fn render_markdown(&self) -> String {
         if self.messages.is_empty() {
             return "No external auth sources were imported.".to_string();
         }
@@ -96,7 +96,7 @@ impl ExternalAuthAutoImportOutcome {
     }
 }
 
-pub(crate) fn pending_external_auth_review_candidates() -> Result<Vec<ExternalAuthReviewCandidate>>
+pub fn pending_external_auth_review_candidates() -> Result<Vec<ExternalAuthReviewCandidate>>
 {
     let mut candidates = Vec::new();
 
@@ -169,7 +169,7 @@ pub(crate) fn pending_external_auth_review_candidates() -> Result<Vec<ExternalAu
     Ok(candidates)
 }
 
-pub(crate) fn parse_external_auth_review_selection(
+pub fn parse_external_auth_review_selection(
     input: &str,
     count: usize,
 ) -> Result<Vec<usize>> {
@@ -411,7 +411,7 @@ async fn validate_external_auth_review_candidate(
     }
 }
 
-pub(crate) async fn maybe_run_external_auth_auto_import_flow() -> Result<Option<usize>> {
+pub async fn maybe_run_external_auth_auto_import_flow() -> Result<Option<usize>> {
     if !can_prompt_for_external_auth() {
         return Ok(None);
     }
@@ -430,7 +430,7 @@ pub(crate) async fn maybe_run_external_auth_auto_import_flow() -> Result<Option<
     Ok(Some(outcome.imported))
 }
 
-pub(crate) fn format_external_auth_review_candidates_markdown(
+pub fn format_external_auth_review_candidates_markdown(
     candidates: &[ExternalAuthReviewCandidate],
 ) -> String {
     let mut message = String::from(
@@ -448,7 +448,7 @@ pub(crate) fn format_external_auth_review_candidates_markdown(
     message
 }
 
-pub(crate) async fn run_external_auth_auto_import_candidates(
+pub async fn run_external_auth_auto_import_candidates(
     candidates: &[ExternalAuthReviewCandidate],
     selected: &[usize],
 ) -> Result<ExternalAuthAutoImportOutcome> {