Junie setup does not have `openspec-sync-specs` skill/instructions

[rChaoz]

I am not sure if this is Junie-specific. Spec syncing does not work correctly (agent just moves files over) because the archive spec says:

If user chooses sync, use Task tool (subagent_type: "general-purpose", prompt: "Use Skill tool to invoke openspec-sync-specs for change '<name>'. Delta spec analysis: <include the analyzed delta spec summary>")

But there's no such skill/tool/instructions included. Junie then skips this step, and just copies the file over as-is. This means the specs keep the ## MODIFIED Requirements headers and openspec view shows 0 total requirements.

These are the included skills currently:

ls .junie/skills                                                                        

    Directory: C:\[...]\.junie\skills

Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
d----          09/05/2026    16:58                openspec-apply-change
d----          09/05/2026    16:58                openspec-archive-change
d----          09/05/2026    16:58                openspec-explore
d----          09/05/2026    16:58                openspec-propose

Note: now that I'm reading the sync skill I see that it also doesn't give a spec template, only for the deltas. Maybe it could include something like:

**Main Spec Format Reference**

```markdown
# Capability Name Specification

## Purpose
Short description of the capability and why it exists.

## Requirements

### Requirement: Feature name
The system SHALL do something.

#### Scenario: Some scenario
- **WHEN** user does X
- **THEN** system does Y

#### Scenario: ...
```