chore: rebrand companion-os to clanker-agent

- Rename all package names from companion-* to clanker-*
- Update npm scopes from @mariozechner to @harivansh-afk
- Rename config directories .companion -> .clanker
- Rename environment variables COMPANION_* -> CLANKER_*
- Update all documentation, README files, and install scripts
- Rename package directories (companion-channels, companion-grind, companion-teams)
- Update GitHub URLs to harivansh-afk/clanker-agent
- Preserve full git history from companion-cloud monorepo

packages/coding-agent/docs/skills.md

@@ -1,10 +1,10 @@
-> companion can create skills. Ask it to build one for your use case.
+> clanker can create skills. Ask it to build one for your use case.
 
 # Skills
 
 Skills are self-contained capability packages that the agent loads on-demand. A skill provides specialized workflows, setup instructions, helper scripts, and reference documentation for specific tasks.
 
-Companion implements the [Agent Skills standard](https://agentskills.io/specification), warning about violations but remaining lenient.
+Clanker implements the [Agent Skills standard](https://agentskills.io/specification), warning about violations but remaining lenient.
 
 ## Table of Contents
 
@@ -21,15 +21,15 @@ Companion implements the [Agent Skills standard](https://agentskills.io/specific
 
 > **Security:** Skills can instruct the model to perform any action and may include executable code the model invokes. Review skill content before use.
 
-Companion loads skills from:
+Clanker loads skills from:
 
 - Global:
-  - `~/.companion/agent/skills/`
+  - `~/.clanker/agent/skills/`
   - `~/.agents/skills/`
 - Project:
-  - `.companion/skills/`
+  - `.clanker/skills/`
   - `.agents/skills/` in `cwd` and ancestor directories (up to git repo root, or filesystem root when not in a repo)
-- Packages: `skills/` directories or `companion.skills` entries in `package.json`
+- Packages: `skills/` directories or `clanker.skills` entries in `package.json`
 - Settings: `skills` array with files or directories
 - CLI: `--skill <path>` (repeatable, additive even with `--no-skills`)
 
@@ -50,7 +50,7 @@ To use skills from Claude Code or OpenAI Codex, add their directories to setting
 }
 ```
 
-For project-level Claude Code skills, add to `.companion/settings.json`:
+For project-level Claude Code skills, add to `.clanker/settings.json`:
 
 ```json
 {
@@ -60,7 +60,7 @@ For project-level Claude Code skills, add to `.companion/settings.json`:
 
 ## How Skills Work
 
-1. At startup, companion scans skill locations and extracts names and descriptions
+1. At startup, clanker scans skill locations and extracts names and descriptions
 2. The system prompt includes available skills in XML format per the [specification](https://agentskills.io/integrate-skills)
 3. When a task matches, the agent uses `read` to load the full SKILL.md (models don't always do this; use prompting or `/skill:name` to force it)
 4. The agent follows the instructions, using relative paths to reference scripts and assets
@@ -174,7 +174,7 @@ description: Helps with PDFs.
 
 ## Validation
 
-Companion validates skills against the Agent Skills standard. Most issues produce warnings but still load the skill:
+Clanker validates skills against the Agent Skills standard. Most issues produce warnings but still load the skill:
 
 - Name doesn't match parent directory
 - Name exceeds 64 characters or contains invalid characters
@@ -229,4 +229,4 @@ cd /path/to/brave-search && npm install
 ## Skill Repositories
 
 - [Anthropic Skills](https://github.com/anthropics/skills) - Document processing (docx, pdf, pptx, xlsx), web development
-- [Companion Skills](https://github.com/badlogic/companion-skills) - Web search, browser automation, Google APIs, transcription
+- [Clanker Skills](https://github.com/badlogic/clanker-skills) - Web search, browser automation, Google APIs, transcription