docs(rebrand): rename & rebrand CI → CIAgent across all documentation, templates, and scripts

- README.md: title, project name, CLI commands, .ci/ → .ciagent/, ci-files → ciagent-files, CI Modification → CIAgent Modification
- AGENTS.md: title, project name, architecture tree, agent count (18→19), test count (25→31 suites, 218→370 tests), version (0.4.0→0.6.0), ci-files → ciagent-files, CIConfig → CIAgentConfig, CiMetadata → CIAgentMetadata, .ci/ → .ciagent/
- templates/DECISIONS.md: .ci/audit/ → .ciagent/audit/, ci audit → ciagent audit
- scripts/postinstall.js: CI postinstall → CIAgent postinstall
- scripts/install.sh: CI → CIAgent, ci-init → ciagent-init, INSTALL COMPLETE banner
- opencode/ci/workflows/*.md (11 files): .ci/ → .ciagent/, CI → CIAgent project name, ci-command → ciagent-command usage lines
- opencode/ci/references/*.md (5 files): .ci/ → .ciagent/, CI → CIAgent project name, ci-files → ciagent-files references
- opencode/ci/contexts/*.md (3 files): .ci/ → .ciagent/, CI → CIAgent project name
- opencode/agents/ci-*.md (18 files): .ci/ → .ciagent/, CI → CIAgent project name
- opencode/command/ci-*.md (11 files): CI → CIAgent project name

Preserved: ---ci---/---/ci--- markers, opencode/ci/ dir paths, ci-*.md filenames, ci listProjects()/ci setActiveProject() API names, repo URLs

---ci---
phase: 1
milestone: v0.6
plan: 01-01
task: 01-01-01
status: execute
---/ci---

opencode/ci/workflows/init.md

@@ -1,21 +1,21 @@
 ---
-description: Initialize a new CI project — specification → clarify → create .ci/ reference files → initial commit
+description: Initialize a new CIAgent project — specification → clarify → create .ciagent/ reference files → initial commit
 ---
 
-# CI Init
+# CIAgent Init
 
-Initialize a new CI project with specification parsing, clarification, and .ci/ reference file creation.
+Initialize a new CIAgent project with specification parsing, clarification, and .ciagent/ reference file creation.
 
-**Usage:** `ci-init [description]`
+**Usage:** `ciagent-init [description]`
 
 ## Step 0: Confirm Active Project
 
-Check `ci listProjects()` or read `.ci/config.json` to determine if multi-project mode is active.
+Check `ci listProjects()` or read `.ciagent/config.json` to determine if multi-project mode is active.
 
-If `.ci/config.json` has `projects[]` with length > 0:
+If `.ciagent/config.json` has `projects[]` with length > 0:
 - Confirm `active_project` is correct for this initialization
 - If not, set it with `ci setActiveProject(<slug>)`
-- All subsequent operations use `.ci/<slug>/` subdirectories
+- All subsequent operations use `.ciagent/<slug>/` subdirectories
 - All commit messages must include `project: <slug>` in `---ci---` block
 
 If single-project mode: proceed with existing conventions.
@@ -29,12 +29,12 @@ Verify git is initialized:
 
 If NO_GIT: `git init`
 
-Check if `.ci/config.json` already exists:
+Check if `.ciagent/config.json` already exists:
 ```bash
-[ -f .ci/config.json ] && echo "ALREADY_INITIALIZED" || echo "NEW"
+[ -f .ciagent/config.json ] && echo "ALREADY_INITIALIZED" || echo "NEW"
 ```
 
-If ALREADY_INITIALIZED: stop. Use `ci-status` to see project state.
+If ALREADY_INITIALIZED: stop. Use `ciagent-status` to see project state.
 
 ## Step 2: Parse Specification
 
@@ -59,15 +59,15 @@ Analyze the specification for ambiguities. For each ambiguity:
 
 Record decisions in the `---ci---` block of the init commit.
 
-## Step 4: Create .ci/ Files
+## Step 4: Create .ciagent/ Files
 
 Use CiFiles to create the project structure:
 
-1. `.ci/config.json` — registry with `projects[]` and `active_project`
-2. `.ci/<slug>/PROJECT.md` — vision, requirements, constraints, key decisions (or `.ci/PROJECT.md` in single-project mode)
-3. `.ci/<slug>/ARCHITECTURE.md` — system architecture (initial, may be incomplete)
-4. `.ci/<slug>/ROADMAP.md` — phase breakdown (to be refined by roadmapper)
-5. `.ci/<slug>/REQUIREMENTS.md` — formal requirements with REQ-IDs
+1. `.ciagent/config.json` — registry with `projects[]` and `active_project`
+2. `.ciagent/<slug>/PROJECT.md` — vision, requirements, constraints, key decisions (or `.ciagent/PROJECT.md` in single-project mode)
+3. `.ciagent/<slug>/ARCHITECTURE.md` — system architecture (initial, may be incomplete)
+4. `.ciagent/<slug>/ROADMAP.md` — phase breakdown (to be refined by roadmapper)
+5. `.ciagent/<slug>/REQUIREMENTS.md` — formal requirements with REQ-IDs
 
 `initCI()` accepts `projectSlug` and `projectName` parameters for multi-project initialization.
 
@@ -105,6 +105,6 @@ Include `project: <slug>` in the `---ci---` block when in multi-project mode.
 
 ## Step 7: Done
 
-Report project initialized, .ci/ files created, initial branch created.
+Report project initialized, .ciagent/ files created, initial branch created.
 
-Next: `ci-run` to execute the pipeline, or `ci-quick` for ad-hoc tasks.
+Next: `ciagent-run` to execute the pipeline, or `ciagent-quick` for ad-hoc tasks.