docs: integrate Entire CLI across guide (v3.27.0)

Major integration of Entire CLI, an agent-native platform launched
Feb 2026 by Thomas Dohmke (ex-GitHub CEO) with $60M funding. Provides
rewindable checkpoints, approval gates, and audit trails for AI sessions.

## Added (7 guide files + 3 meta files)

- **ai-traceability.md**: Replace git-ai 404 with Entire CLI (section 5.1)
- **third-party-tools.md**: Fill "Session replay" gap + add tool section
- **observability.md**: Add session portability alternative
- **ai-ecosystem.md**: Add governance-first orchestration (section 8.1.5)
- **ultimate-guide.md**: Enrich multi-instance section 9.17
- **security-hardening.md**: Add compliance audit trails (section 3.4)
- **cheatsheet.md**: Add Community Tools quick reference
- **README.md**: Update structure tree with third-party-tools mention
- **CHANGELOG.md**: Document v3.27.0 release
- **docs/resource-evaluations/entire-cli.md**: Formal evaluation (5/5)

## Fixed

- git-ai references (404 repo) replaced with working alternative
- "Session replay" Known Gap now marked as ✅ FILLED

## Key Features Documented

- Rewindable checkpoints (prompts + reasoning + tool usage)
- Governance layer (approval gates, permissions, audit trails)
- Multi-agent handoffs (Claude → Gemini with context)
- Compliance-ready (SOC2, HIPAA, FedRAMP)
- Session portability (path-agnostic vs native --resume)

## Positioning

- vs git-ai: Replaces non-existent tool (404)
- vs claude-code-viewer: Active replay vs read-only history
- vs Gas Town: Governance sequential vs parallel coordination

Files modified: 10 (7 content + 3 meta)
Words added: ~2,500
Version: 3.26.0 → 3.27.0

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

guide/ultimate-guide.md

@@ -10,7 +10,7 @@
 
 **Last updated**: January 2026
 
-**Version**: 3.26.0
+**Version**: 3.27.0
 
 ---
 
@@ -4283,7 +4283,7 @@ The `.claude/` folder is your project's Claude Code directory for memory, settin
 | Personal preferences | `CLAUDE.md` | ❌ Gitignore |
 | Personal permissions | `settings.local.json` | ❌ Gitignore |
 
-### 3.26.0 Version Control & Backup
+### 3.27.0 Version Control & Backup
 
 **Problem**: Without version control, losing your Claude Code configuration means hours of manual reconfiguration across agents, skills, hooks, and MCP servers.
 
@@ -14720,9 +14720,11 @@ Don't jump to 10 instances. Scale progressively with validation gates.
 **Goal**: Scale to 3-5 instances with orchestration framework.
 
 ```bash
-# 1. Deploy Headless PM (or equivalent)
-# - Task locking to prevent conflicts
-# - Monitoring dashboard
+# 1. Deploy orchestration framework (choose based on needs)
+# - Headless PM (manual coordination)
+# - Gas Town (parallel task execution)
+# - multiclaude (self-hosted, tmux-based)
+# - Entire CLI (governance + sequential handoffs)
 
 # 2. Define roles
 # - Architect (reviews PRs)
@@ -14736,6 +14738,17 @@ Don't jump to 10 instances. Scale progressively with validation gates.
 # - Adjust instance count
 ```
 
+**Orchestration framework options:**
+
+| Tool | Paradigm | Best For |
+|------|----------|----------|
+| **Manual (worktrees)** | No framework | 2-3 instances, full control |
+| **Gas Town** | Parallel coordination | 5+ instances, complex parallel tasks |
+| **multiclaude** | Self-hosted spawner | Teams needing on-prem/airgap |
+| **Entire CLI** | Governance + handoffs | Sequential workflows with compliance |
+
+> **Entire CLI** (Feb 2026): Alternative to parallel orchestration, focuses on **sequential agent handoffs** with governance layer (approval gates, audit trails). Useful for compliance-critical workflows (SOC2, HIPAA) or multi-agent handoffs (Claude → Gemini). See [AI Ecosystem Guide](./ai-ecosystem.md#entire-cli-governance-first-orchestration) for details.
+
 **Success criteria**: Sustained 3-5% productivity gain over 3 months.
 
 ---
@@ -19354,4 +19367,4 @@ We'll evaluate and add it to this section if it meets quality criteria.
 
 **Contributions**: Issues and PRs welcome.
 
-**Last updated**: January 2026 | **Version**: 3.26.0
+**Last updated**: January 2026 | **Version**: 3.27.0