refactor(rebrand): rename & rebrand CI → CIAgent across all source and test files

- Type renames: CIConfig → CIAgentConfig, DEFAULT_CI_CONFIG → DEFAULT_CIAGENT_CONFIG
- Type renames: CiMetadata → CIAgentMetadata, ParsedCiCommit → ParsedCIAgentCommit
- Function renames: initCI → initCIAgent, isCIInitialized → isCIAgentInitialized
- Function renames: extractCiBlock → extractCIAgentBlock, parseCiBlock → parseCIAgentBlock
- Class renames: CiFiles → CIAgentFiles
- Import paths: ci-files.js → ciagent-files.js
- Directory paths: .ci/ → .ciagent/ across all source and test files
- Check names: ".ci directory exists" → ".ciagent directory exists"
- Check names: "CI config valid" → "CIAgent config valid"
- Temp dir names: ci-*-test- → ciagent-*-test-
- CLI examples: "ci init" → "ciagent init"
- Fix deepMerge infinite recursion bug in config.ts
- ---ci---/---/ci--- block markers preserved unchanged
- All 31 test suites, 370 tests passing

---ci---
phase: 1
milestone: v0.5
plan: 07
task: 07-01-01
status: execute
---/ci---

src/core/escalation.ts

@@ -6,7 +6,7 @@ import {
   EscalationResolution,
   ESCALATION_TYPES,
 } from "../types/escalation.js";
-import { CIConfig } from "../types/config.js";
+import { CIAgentConfig } from "../types/config.js";
 import { CommitBuilder, EscalationCommitInput } from "./commit-builder.js";
 import { CommitEscalation } from "../types/commit-meta.js";
 
@@ -22,7 +22,7 @@ export interface EscalationInput {
 }
 
 export class EscalationProtocol {
-  private config: CIConfig;
+  private config: CIAgentConfig;
   private projectPath: string;
   private currentMilestone: string;
   private counter: number;
@@ -31,7 +31,7 @@ export class EscalationProtocol {
   private timers: NodeJS.Timeout[];
 
   constructor(
-    config: CIConfig,
+    config: CIAgentConfig,
     projectPath: string,
     milestone: string = "v1.0",
     timeoutCallback: (escalation: Escalation, chosenOption: string) => void = () => {}
@@ -64,7 +64,7 @@ export class EscalationProtocol {
       options: input.options,
       default_option_id: input.default_option_id,
       resolution: "pending",
-      audit_file: `.ci/audit/deprecated`,
+      audit_file: `.ciagent/audit/deprecated`,
     };
 
     this.pendingEscalations.set(id, escalation);