feat: add Avian coding assistant support

[avianion]

Summary

• Add Avian as a supported AI coding tool in OpenSpec
• Avian uses .avian/ config directory with nested commands/opsx/<id>.md command paths and YAML frontmatter (name, description, category, tags)
• Follows the same adapter pattern as Claude Code and Crush

Changes

• src/core/config.ts — add Avian to AI_TOOLS array (skillsDir: .avian)
• src/core/command-generation/adapters/avian.ts — new command adapter
• src/core/command-generation/adapters/index.ts — export adapter
• src/core/command-generation/registry.ts — register adapter
• docs/supported-tools.md — add Avian to tool directory table and available tool IDs
• test/core/command-generation/adapters.test.ts — 5 new tests for adapter (all passing)

Test plan

• pnpm run build compiles successfully
• pnpm test — all 87 adapter tests pass (5 new Avian tests included)
• Registry test passes (Avian adapter registered)
• available-tools.test.ts passes
• Init test passes with Avian in tool list

cc @TabishB

Summary by CodeRabbit

• New Features

  • Avian tool is now available in the product, enabling use of Avian alongside existing AI tools.

• Documentation

  • Documented Avian in the Tool Directory Reference, including its installation/command path patterns and enabled tool ID.

• Tests

  • Added coverage for Avian command adapter behavior, including file path generation and Markdown/YAML command formatting (including tag handling).

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📥 Commits

Reviewing files that changed from the base of the PR and between 98cdbed and 09c5e4c.

📒 Files selected for processing (4)

• docs/supported-tools.md
• src/core/command-generation/adapters/index.ts
• src/core/command-generation/registry.ts
• src/core/config.ts

🚧 Files skipped from review as they are similar to previous changes (3)

• src/core/command-generation/adapters/index.ts
• src/core/config.ts
• src/core/command-generation/registry.ts

---

📝 Walkthrough

Walkthrough

Adds Avian command-adapter integration, registers Avian in configuration and documentation, and extends adapter tests for paths and formatted command files.

Changes

Avian adapter integration

Layer / File(s)	Summary
Adapter exports and registry wiring src/core/command-generation/adapters/index.ts, src/core/command-generation/registry.ts	Re-exports avianAdapter and registers it in CommandAdapterRegistry.
Tool configuration and documentation src/core/config.ts, docs/supported-tools.md	Adds Avian to AI_TOOLS, the Tool Directory Reference, and the non-interactive --tools list.
Adapter validation test/core/command-generation/adapters.test.ts	Tests Avian identity, .avian/commands/opsx paths, YAML frontmatter formatting, empty tags, and path handling.

Estimated code review effort: 2 (Simple) | ~15 minutes

Possibly related PRs

• Fission-AI/OpenSpec#556: Introduces the multi-provider command-generation and adapter registry structure extended by this change.
• Fission-AI/OpenSpec#864: Adds another tool adapter through the same barrel, registry, configuration, tests, and documentation paths.
• Fission-AI/OpenSpec#886: Follows the same command-adapter integration pattern across core wiring and shared tests.

Suggested reviewers: tabishb

🚥 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 Avian support as a coding assistant/tool.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[greptile-apps]

Greptile Summary

Adds Avian as a supported AI coding tool following OpenSpec's adapter pattern, consistent with other tools like Crush and Claude Code.

• New command adapter formats files with YAML frontmatter (name, description, category, tags) and uses nested .avian/commands/opsx/<id>.md path structure
• Adapter registered in CommandAdapterRegistry alongside 24 other tool adapters
• Tool configuration added to AI_TOOLS array with .avian skillsDir
• 5 comprehensive tests validate adapter behavior (toolId, file paths, frontmatter formatting, empty tags)
• Documentation updated with Avian in tool reference table and available tool IDs list

Confidence Score: 5/5

• This PR is safe to merge with no identified issues
• Implementation perfectly follows established patterns (identical structure to crushAdapter), all changes are additive with no modifications to existing functionality, comprehensive test coverage validates behavior, and documentation is properly updated
• No files require special attention

Important Files Changed

Filename	Overview
src/core/command-generation/adapters/avian.ts	New adapter implementation following established pattern, matches Crush adapter structure
src/core/command-generation/registry.ts	Imported and registered avianAdapter correctly in alphabetical order
src/core/config.ts	Added Avian tool configuration with correct metadata and skillsDir
test/core/command-generation/adapters.test.ts	Added 5 comprehensive tests for Avian adapter following existing test patterns

Class Diagram

%%{init: {'theme': 'neutral'}}%%
classDiagram
    class ToolCommandAdapter {
        <<interface>>
        +string toolId
        +getFilePath(commandId: string) string
        +formatFile(content: CommandContent) string
    }
    
    class CommandAdapterRegistry {
        -Map~string, ToolCommandAdapter~ adapters
        +register(adapter: ToolCommandAdapter) void
        +get(toolId: string) ToolCommandAdapter
        +getAll() ToolCommandAdapter[]
        +has(toolId: string) boolean
    }
    
    class avianAdapter {
        +toolId: "avian"
        +getFilePath(commandId)
        +formatFile(content)
    }
    
    class claudeAdapter {
        +toolId: "claude"
        +getFilePath(commandId)
        +formatFile(content)
    }
    
    class crushAdapter {
        +toolId: "crush"
        +getFilePath(commandId)
        +formatFile(content)
    }
    
    ToolCommandAdapter <|.. avianAdapter : implements
    ToolCommandAdapter <|.. claudeAdapter : implements
    ToolCommandAdapter <|.. crushAdapter : implements
    CommandAdapterRegistry o-- ToolCommandAdapter : registers
    avianAdapter --> CommandAdapterRegistry : registered in static block

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_{Last reviewed commit: 952533d}

[avianion]

Friendly follow-up — this PR is still active and ready for review. Would appreciate a look when you get a chance! cc @TabishB

[avianion]

Friendly follow-up — this PR is still active and ready for review. All feedback has been addressed. Would appreciate a look when you get a chance! cc @TabishB

[avianion]

Hey @TabishB — friendly follow-up on this PR. Avian is an OpenAI-compatible inference provider that's already live and powering apps like ISEKAI ZERO. This is a lightweight integration (standard OpenAI-compatible endpoint) and we're happy to address any feedback or make adjustments. Would love to get this merged if you have a moment to review. Thanks!

[avianion]

Resolved merge conflicts with latest upstream main.

[avianion]

Resolved merge conflicts with latest upstream main.