docs: Add OSS project files (CHANGELOG, linter config, release docs)

- CHANGELOG.md: Initial release notes for v0.1.0
- .golangci.yml: Linter configuration adapted from beads
- RELEASING.md: Release process documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

CHANGELOG.md

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+# Changelog
+
+All notable changes to the Gas Town project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2026-01-02
+
+### Added
+
+Initial public release of Gas Town - a multi-agent workspace manager for Claude Code.
+
+#### Core Architecture
+- **Town structure** - Hierarchical workspace with rigs, crews, and polecats
+- **Rig management** - `gt rig add/list/remove` for project containers
+- **Crew workspaces** - `gt crew add` for persistent developer workspaces
+- **Polecat workers** - Transient agent workers managed by Witness
+
+#### Agent Roles
+- **Mayor** - Global coordinator for cross-rig work
+- **Deacon** - Town-level lifecycle patrol and heartbeat
+- **Witness** - Per-rig polecat lifecycle manager
+- **Refinery** - Merge queue processor with code review
+- **Crew** - Persistent developer workspaces
+- **Polecat** - Transient worker agents
+
+#### Work Management
+- **Convoy system** - `gt convoy create/list/status` for tracking related work
+- **Sling workflow** - `gt sling <bead> <rig>` to assign work to agents
+- **Hook mechanism** - Work attached to agent hooks for pickup
+- **Molecule workflows** - Formula-based multi-step task execution
+
+#### Communication
+- **Mail system** - `gt mail inbox/send/read` for agent messaging
+- **Escalation protocol** - `gt escalate` with severity levels
+- **Handoff mechanism** - `gt handoff` for context-preserving session cycling
+
+#### Integration
+- **Beads integration** - Issue tracking via beads (`bd` commands)
+- **Tmux sessions** - Agent sessions in tmux with theming
+- **GitHub CLI** - PR creation and merge queue via `gh`
+
+#### Developer Experience
+- **Status dashboard** - `gt status` for town overview
+- **Session cycling** - `C-b n/p` to navigate between agents
+- **Activity feed** - `gt feed` for real-time event stream
+- **Nudge system** - `gt nudge` for reliable message delivery to sessions
+
+### Infrastructure
+- **Daemon mode** - Background lifecycle management
+- **npm package** - Cross-platform binary distribution
+- **GitHub Actions** - CI/CD workflows for releases
+- **GoReleaser** - Multi-platform binary builds