feat(event-watchers): rework file state detection and migrate tree-sitter integration

Switch file state checks to trigger on FocusedViewEvent instead of TextChangedEvent
Resolve file via files controller and operate directly on file object
Add user prompt for externally modified files with optional reload
Auto-reload unmodified buffers when external changes are detected
Simplify file_is_deleted / file_is_externally_modified APIs

tree-sitter

Remove bundled tree_sitter_language_pack and related setup/notes scripts
Introduce local lightweight tree_sitter wrapper (Parser, get_parser)
Store parser per file and generate AST directly from buffer text
Remove runtime language download/config logic
Update manifest (drop autoload)

core

Simplify CLI file handling in BaseControllerMixin
Send directory args directly via IPC instead of encoding in file list

cleanup

Remove unused libs, scripts, and legacy code paths

plugins/code/event-watchers/tree_sitter/languages/scripts/build.sh

@@ -0,0 +1,134 @@
+#!/bin/bash
+
+# . CONFIG.sh
+
+# set -o xtrace       ## To debug scripts
+# set -o errexit      ## To exit on error
+# set -o errunset     ## To exit if a variable is referenced but not set
+#!/usr/bin/env bash
+set -euo pipefail
+
+
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+TOOLS="$ROOT/.tools"
+NODE_DIR="$TOOLS/node"
+GRAMMARS_DIR="$ROOT/grammars"
+BUILD_DIR="$ROOT/build"
+OUTPUT="$ROOT/compiled"
+NODE_VERSION="v24.14.1"
+NODE_DIST="node-$NODE_VERSION-linux-x64"
+NODE_ARCHIVE="$TOOLS/node.tar.xz"
+NODE_URL="https://nodejs.org/dist/$NODE_VERSION/$NODE_DIST.tar.xz"
+TS_CLI_VERSION="0.22.6"
+
+
+LANGS=(
+    tree-sitter-python
+    tree-sitter-javascript
+    tree-sitter-html
+    tree-sitter-css
+    tree-sitter-json
+    tree-sitter-java
+    tree-sitter-c
+    tree-sitter-cpp
+    tree-sitter-go
+)
+
+REPOS=(
+    https://github.com/tree-sitter/tree-sitter-python
+    https://github.com/tree-sitter/tree-sitter-javascript
+    https://github.com/tree-sitter/tree-sitter-html
+    https://github.com/tree-sitter/tree-sitter-css
+    https://github.com/tree-sitter/tree-sitter-json
+    https://github.com/tree-sitter/tree-sitter-java
+    https://github.com/tree-sitter/tree-sitter-c
+    https://github.com/tree-sitter/tree-sitter-cpp
+    https://github.com/tree-sitter/tree-sitter-go
+)
+
+mkdir -p "$TOOLS" "$GRAMMARS_DIR" "$BUILD_DIR" "$OUTPUT"
+
+ensure_node() {
+    if [ -x "$NODE_DIR/bin/node" ]; then
+        echo "==> Using cached Node.js"
+        return
+    fi
+
+    echo "==> Downloading Node.js $NODE_VERSION"
+    wget -O "$NODE_ARCHIVE" "$NODE_URL"
+
+    echo "==> Extracting Node.js"
+    mkdir -p "$NODE_DIR"
+    tar -xf "$NODE_ARCHIVE" -C "$NODE_DIR" --strip-components=1
+    rm "$NODE_ARCHIVE"
+
+    echo "==> Node installed at $NODE_DIR"
+}
+
+ensure_tree_sitter() {
+    export PATH="$NODE_DIR/bin:$PATH"
+    TS="$TOOLS/node_modules/.bin/tree-sitter"
+
+    if [ -x "$TS" ]; then
+        echo "==> Using cached tree-sitter-cli"
+        return
+    fi
+
+    echo "==> Installing tree-sitter-cli"
+    cd "$TOOLS"
+    npm init -y >/dev/null 2>&1 || true
+    npm install tree-sitter-cli@$TS_CLI_VERSION
+}
+
+sync_grammars() {
+    echo "==> Syncing grammars"
+
+    for i in "${!LANGS[@]}"; do
+        NAME="${LANGS[$i]}"
+        REPO="${REPOS[$i]}"
+        TARGET="$GRAMMARS_DIR/$NAME"
+
+        if [ -d "$TARGET/.git" ]; then
+            echo "Updating $NAME"
+            git -C "$TARGET" pull --depth 1
+        else
+            echo "Cloning $NAME"
+            git clone --depth 1 "$REPO" "$TARGET"
+        fi
+    done
+}
+
+build_lib() {
+    echo "==> Building Tree-sitter library"
+
+    mkdir -p "$OUTPUT"
+
+    PARSER_SRC=()
+    INCLUDE_PATHS=()
+
+    for GRAMMAR in "${LANGS[@]/#/$GRAMMARS_DIR/}"; do
+        echo "==> Processing grammar $GRAMMAR"
+
+        PARSER_SRC+=("$GRAMMAR/src/parser.c")
+
+        if [[ -f "$GRAMMAR/src/scanner.c" ]]; then
+            PARSER_SRC+=("$GRAMMAR/src/scanner.c")
+        fi
+
+        INCLUDE_PATHS+=("-I$GRAMMAR/src")
+    done
+
+    gcc -shared -o "$OUTPUT/languages.so" "${PARSER_SRC[@]}" "${INCLUDE_PATHS[@]}" -fPIC
+
+    echo "==> Output: $OUTPUT/languages.so"
+}
+
+main() {
+    ensure_node
+    ensure_tree_sitter
+    sync_grammars
+    build_lib
+}
+
+main "$@"