refactor(build): migrated imports to path aliases with per-package tsconfig support

- converted relative imports to path aliases ($c/*, $ai/*, $tui/*, etc.) across all packages
- added per-package tsconfig.json with complete path mappings for runtime resolution
- set importModuleSpecifier to non-relative for IDE auto-import preferences
- updated dev script to run from monorepo root for consistent path resolution

packages/coding-agent/src/cli/args.ts

@@ -4,8 +4,8 @@
 
 import type { ThinkingLevel } from "@oh-my-pi/pi-agent-core";
 import chalk from "chalk";
-import { APP_NAME, CONFIG_DIR_NAME, ENV_AGENT_DIR } from "../config";
-import { BUILTIN_TOOLS } from "../core/tools/index";
+import { APP_NAME, CONFIG_DIR_NAME, ENV_AGENT_DIR } from "$c/config";
+import { BUILTIN_TOOLS } from "$c/core/tools/index";
 
 export type Mode = "text" | "json" | "rpc";
 

packages/coding-agent/src/cli/config-cli.ts

@@ -6,10 +6,10 @@
  */
 
 import chalk from "chalk";
-import { APP_NAME, getAgentDir } from "../config";
-import { SettingsManager } from "../core/settings-manager";
-import { SETTINGS_DEFS, type SettingDef } from "../modes/interactive/components/settings-defs";
-import { theme } from "../modes/interactive/theme/theme";
+import { APP_NAME, getAgentDir } from "$c/config";
+import { SettingsManager } from "$c/core/settings-manager";
+import { SETTINGS_DEFS, type SettingDef } from "$c/modes/interactive/components/settings-defs";
+import { theme } from "$c/modes/interactive/theme/theme";
 
 // =============================================================================
 // Types

packages/coding-agent/src/cli/file-processor.ts

@@ -6,9 +6,9 @@ import { existsSync, readFileSync, statSync } from "node:fs";
 import { resolve } from "node:path";
 import type { ImageContent } from "@oh-my-pi/pi-ai";
 import chalk from "chalk";
-import { resolveReadPath } from "../core/tools/path-utils";
-import { formatDimensionNote, resizeImage } from "../utils/image-resize";
-import { detectSupportedImageMimeTypeFromFile } from "../utils/mime";
+import { resolveReadPath } from "$c/core/tools/path-utils";
+import { formatDimensionNote, resizeImage } from "$c/utils/image-resize";
+import { detectSupportedImageMimeTypeFromFile } from "$c/utils/mime";
 
 export interface ProcessedFiles {
 	text: string;

packages/coding-agent/src/cli/list-models.ts

@@ -3,8 +3,8 @@
  */
 
 import type { Api, Model } from "@oh-my-pi/pi-ai";
-import type { ModelRegistry } from "../core/model-registry";
-import { fuzzyFilter } from "../utils/fuzzy";
+import type { ModelRegistry } from "$c/core/model-registry";
+import { fuzzyFilter } from "$c/utils/fuzzy";
 
 /**
  * Format a number as human-readable (e.g., 200000 -> "200K", 1000000 -> "1M")

packages/coding-agent/src/cli/plugin-cli.ts

@@ -5,9 +5,9 @@
  */
 
 import chalk from "chalk";
-import { APP_NAME } from "../config";
-import { PluginManager, parseSettingValue, validateSetting } from "../core/plugins/index";
-import { theme } from "../modes/interactive/theme/theme";
+import { APP_NAME } from "$c/config";
+import { PluginManager, parseSettingValue, validateSetting } from "$c/core/plugins/index";
+import { theme } from "$c/modes/interactive/theme/theme";
 
 // =============================================================================
 // Types

packages/coding-agent/src/cli/session-picker.ts

@@ -3,8 +3,8 @@
  */
 
 import { ProcessTerminal, TUI } from "@oh-my-pi/pi-tui";
-import type { SessionInfo } from "../core/session-manager";
-import { SessionSelectorComponent } from "../modes/interactive/components/session-selector";
+import type { SessionInfo } from "$c/core/session-manager";
+import { SessionSelectorComponent } from "$c/modes/interactive/components/session-selector";
 
 /** Show TUI session selector and return selected session path or null if cancelled */
 export async function selectSession(sessions: SessionInfo[]): Promise<string | null> {

packages/coding-agent/src/cli/setup-cli.ts

@@ -6,8 +6,8 @@
 
 import { $ } from "bun";
 import chalk from "chalk";
-import { APP_NAME } from "../config";
-import { theme } from "../modes/interactive/theme/theme";
+import { APP_NAME } from "$c/config";
+import { theme } from "$c/modes/interactive/theme/theme";
 
 export type SetupComponent = "python";
 

packages/coding-agent/src/cli/stats-cli.ts

@@ -5,7 +5,7 @@
  */
 
 import chalk from "chalk";
-import { APP_NAME } from "../config";
+import { APP_NAME } from "$c/config";
 
 // =============================================================================
 // Types

packages/coding-agent/src/cli/update-cli.ts

@@ -11,8 +11,8 @@ import { dirname } from "node:path";
 import { Readable } from "node:stream";
 import { pipeline } from "node:stream/promises";
 import chalk from "chalk";
-import { APP_NAME, VERSION } from "../config";
-import { theme } from "../modes/interactive/theme/theme";
+import { APP_NAME, VERSION } from "$c/config";
+import { theme } from "$c/modes/interactive/theme/theme";
 
 /**
  * Detect if we're running as a Bun compiled binary.