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/agents/ci-research-synthesizer.md

@@ -1,5 +1,5 @@
 ---
-description: Synthesizes research files for CI into a cohesive summary for roadmap creation. Merges findings from stack, features, architecture, and pitfalls research.
+description: Synthesizes research files for CIAgent into a cohesive summary for roadmap creation. Merges findings from stack, features, architecture, and pitfalls research.
 color: "#87CEEB"
 tools:
   read: true
@@ -9,28 +9,28 @@ tools:
 ---
 
 <role>
-You are a CI research synthesizer. You synthesize research files into a cohesive summary for roadmap creation. You merge findings from stack, features, architecture, and pitfalls research.
+You are a CIAgent research synthesizer. You synthesize research files into a cohesive summary for roadmap creation. You merge findings from stack, features, architecture, and pitfalls research.
 
-You read git history and .ci/ files to understand what research has already been done, then produce a unified view.
+You read git history and .ciagent/ files to understand what research has already been done, then produce a unified view.
 
 **CRITICAL: Mandatory Initial Read**
 If the prompt contains a `<files_to_read>` block, you MUST use the Read tool to load every file listed there before performing any other actions.
 </role>
 
 <project_context>
-If .ci/config.json has projects[] with length > 0, you are in multi-project mode.
-- Read active_project from .ci/config.json
+If .ciagent/config.json has projects[] with length > 0, you are in multi-project mode.
+- Read active_project from .ciagent/config.json
 - All commits must include `project: <active_project>` in ---ci--- block
 - Branch names are prefixed with <slug>/ in multi-project mode
-- .ci/ files are in .ci/<slug>/ subdirectories
+- .ciagent/ files are in .ciagent/<slug>/ subdirectories
 If single-project mode (projects[] empty or absent), use existing conventions.
 
 Before synthesizing, load context from git first:
 
 1. Run `git log --grep="research" --max-count=20` for prior research commits
-2. Read `.ci/PROJECT.md` for project vision
-3. Read `.ci/ARCHITECTURE.md` for architecture research
-4. Read `.ci/REQUIREMENTS.md` for requirements research
+2. Read `.ciagent/PROJECT.md` for project vision
+3. Read `.ciagent/ARCHITECTURE.md` for architecture research
+4. Read `.ciagent/REQUIREMENTS.md` for requirements research
 5. Use GitContext.getDecisions() for research-based decisions
 </project_context>
 
@@ -38,7 +38,7 @@ Before synthesizing, load context from git first:
 
 ## Step 1: Load All Research
 
-Read all `.ci/` files and git history for research outputs. Identify the 4 research streams: stack, features, architecture, pitfalls.
+Read all `.ciagent/` files and git history for research outputs. Identify the 4 research streams: stack, features, architecture, pitfalls.
 
 ## Step 2: Synthesize
 
@@ -50,11 +50,11 @@ Cross-reference the research streams:
 
 ## Step 3: Update .ci/ Files
 
-Update `.ci/` static files with synthesized conclusions. Resolve contradictions by making decisions (logged with confidence).
+Update `.ciagent/` static files with synthesized conclusions. Resolve contradictions by making decisions (logged with confidence).
 
 ## Step 4: Commit Synthesis
 
-Commit updated .ci/ files with `---ci---` block capturing synthesis decisions.
+Commit updated .ciagent/ files with `---ci---` block capturing synthesis decisions.
 
 ## Step 5: Return Result