feat: add AtomCode command adapter support

[hu-qi]

Summary

Adds AtomCode as a supported tool in OpenSpec with its own command adapter.

AtomCode is an open-source terminal AI coding assistant (by AtomGit) that uses the same Agent Skills spec as Claude Code. It stores custom commands in .atomcode/commands/ with YAML frontmatter (description field).

Closes #1210

Changes

• New adapter (src/core/command-generation/adapters/atomcode.ts):
  • File path: .atomcode/commands/opsx-<id>.md
  • Frontmatter: description only (AtomCode supports additional fields like name, argument-hint, allowed-tools but these are optional)
  • Command references transformed from colon (/opsx:apply) to hyphen format (/opsx-apply) via transformToHyphenCommands
• Registration: Added to index.ts, registry.ts, and config.ts (with skillsDir: '.atomcode')
• Documentation: Updated supported-tools.md and cli.md with AtomCode entry
• Tests: 6 new test cases for atomcodeAdapter (toolId, file path, frontmatter, no extra fields, command reference transformation)
• Changeset: Added .changeset/atomcode-support.md for minor version bump

Test Results

✓ 122 tests passed (including 6 new atomcodeAdapter tests)
✓ TypeScript compilation clean
✓ pnpm build successful

Summary by CodeRabbit

Release Notes

• New Features

  • OpenSpec now supports AtomCode as a tool option. Users can initialize projects with AtomCode using openspec init --tools atomcode, enabling direct integration with AtomCode's Agent Skills and slash commands directory structure.

• Documentation

  • Updated CLI reference and supported tools documentation to include AtomCode configuration details and usage guidance.

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds AtomCode as a supported tool in OpenSpec. A new atomcodeAdapter is implemented, exported from the adapters index, and registered in CommandAdapterRegistry. The AI_TOOLS config gains an atomcode entry. Tests, documentation, and a changeset entry are added accordingly.

Changes

AtomCode Tool Integration

Layer / File(s)	Summary
AtomCode adapter implementation and wiring src/core/command-generation/adapters/atomcode.ts, src/core/command-generation/adapters/index.ts, src/core/command-generation/registry.ts, src/core/config.ts	New atomcodeAdapter generates .atomcode/commands/opsx-<commandId>.md files with description-only frontmatter and hyphenated command references. Re-exported from the adapters index, registered in CommandAdapterRegistry's static initializer, and the AI_TOOLS array gains an atomcode entry with skillsDir: '.atomcode'.
Adapter tests and documentation test/core/command-generation/adapters.test.ts, docs/supported-tools.md, docs/cli.md, .changeset/atomcode-support.md	Tests validate toolId, file path output, description-only frontmatter (omitting name, category, tags), and /opsx:<name> → /opsx-<name> body transformation. The adapter is added to the shared "all adapters" path test. Docs add AtomCode to the tool directory reference table and the available tool IDs list. A minor changeset entry is included.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Fission-AI/OpenSpec#707: Extends the same command-adapter plumbing (adapters index, registry, config) for a different tool (Kiro), following the identical pattern used here.
• Fission-AI/OpenSpec#864: Wires another new tool (Lingma) into adapters/index.ts, registry.ts, and config.ts using the same integration structure.
• Fission-AI/OpenSpec#1027: Updates docs/cli.md and docs/supported-tools.md to keep listed tool IDs in sync with AI_TOOLS, the same documentation surfaces modified here.

Suggested reviewers

• TabishB

🐇 A new tool hops into the den,
AtomCode joins the OpenSpec pen!
Commands with hyphens, skills in .atomcode/,
Frontmatter trimmed to description alone.
The registry grows, the tests all pass —
Another adapter added at last! 🌟

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding AtomCode command adapter support, which matches the primary objective of the PR.
Linked Issues check	✅ Passed	All objectives from issue #1210 are met: AtomCode added to AI_TOOLS config, dedicated adapter created, registered in the system, documented, and compatible with Agent Skills spec.
Out of Scope Changes check	✅ Passed	All changes are directly related to adding AtomCode support as specified in issue #1210; no unrelated modifications detected.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/cli.md`:
- Line 110: The supported tool IDs list in docs/cli.md is missing the tool ID
vibe, which causes documentation to be out of sync with the actual
implementation in src/core/config.ts that includes value vibe. Add vibe to the
comma-separated list of supported tool IDs (--tools) in alphabetical order with
the other tools to ensure documentation accurately reflects the supported
capabilities.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 3d9b8cb7-08b9-46bb-b701-aa50b0129647

📥 Commits

Reviewing files that changed from the base of the PR and between 1b06fdd and dc504c0.

📒 Files selected for processing (8)

• .changeset/atomcode-support.md
• docs/cli.md
• docs/supported-tools.md
• src/core/command-generation/adapters/atomcode.ts
• src/core/command-generation/adapters/index.ts
• src/core/command-generation/registry.ts
• src/core/config.ts
• test/core/command-generation/adapters.test.ts