v2.2.9

feat(cli): helix sync + integrating with dashboard and backend (#868)

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<h3>Greptile Summary</h3>

This PR implements `helix sync` to pull schema and query files from
Helix Cloud clusters, integrating the CLI with the dashboard backend. It
adds comprehensive workspace/project/cluster management flows for both
standard and enterprise deployments.

**Major additions:**
- New `helix sync` command with three flows: workspace-based,
project-based, and instance-specific syncing
- Interactive workspace/project/cluster selection using `cliclack`
prompts
- Enterprise cluster support across `add`, `init`, `sync`, and `delete`
commands
- Path sanitization for remote files to prevent directory traversal
attacks
- Workspace config persistence to `~/.helix/config`
- New `intersect` graph traversal operator in the query engine
- Fixed `Ord` implementation in `Value` type to use consistent variant
ordering

**Critical issues found:**
1. `helix-cli/src/commands/sync.rs:495` - `config.enterprise.clear()`
unconditionally removes ALL enterprise instances, not just those from
the selected project (similar to the already-flagged issue with cloud
instances)
2. `helix-cli/src/commands/delete.rs:93,99` - `todo!()` macros will
panic when users delete enterprise instances
3. `helix-db/src/protocol/value.rs:237-249` - Ord/PartialEq
inconsistency in Date↔String comparison due to reversed ordering

**Recommendations:**
- Replace `config.enterprise.clear()` with selective removal logic (like
`config.cloud.retain()`)
- Implement enterprise instance deletion instead of using `todo!()`
- Fix the Date/String comparison ordering to maintain Ord/PartialEq
consistency

<details><summary><h3>Important Files Changed</h3></summary>




| Filename | Overview |
|----------|----------|
| helix-cli/src/commands/sync.rs | New 1410-line file implementing
`helix sync` command with workspace/project/cluster selection flows,
file syncing from cloud, and path sanitization. Notable issue:
`reconcile_project_config_from_cloud` clears all enterprise entries
(line 495) which could delete unrelated instances. |
| helix-cli/src/commands/workspace_flow.rs | New 456-line file
implementing workspace → project → cluster creation flow for `helix add`
and `helix init`. Clean implementation with proper workspace caching,
billing checks, and enterprise cluster support. |
| helix-cli/src/prompts.rs | New 551-line file providing interactive CLI
prompts using `cliclack`. Implements workspace/cluster selection, input
validation, and deployment configuration flows. Well-structured with
proper validation logic. |
| helix-cli/src/config.rs | Added `WorkspaceConfig` for persisting
workspace selections to `~/.helix/config`, and
`EnterpriseInstanceConfig` for enterprise cluster support. Clean
additions with proper error handling. |
| helix-cli/src/commands/delete.rs | Added enterprise instance handling
with `todo!()` placeholders on lines 93 and 99. Will panic when users
try to delete enterprise instances created via `helix add cloud` or
`helix init cloud`. |
| helix-db/src/protocol/value.rs | Fixed `Ord` implementation to use
consistent variant ordering instead of returning `Equal` for
incomparable types (which violated Ord contract). Added `Date`↔`String`
comparison logic. |

</details>


</details>


<details><summary><h3>Flowchart</h3></summary>

```mermaid
flowchart TD
    A[helix sync] --> B{Project context<br/>exists?}
    B -->|No| C[Workspace Sync Flow]
    B -->|Yes, with instance| D[Instance-specific Sync]
    B -->|Yes, interactive| E[Project Sync Flow]
    
    C --> F[Load/Select Workspace]
    F --> G[Fetch Workspace Clusters]
    G --> H{Cluster Type?}
    H -->|Standard| I[Sync .hx files from cluster]
    H -->|Enterprise| J[Sync .rs files from cluster]
    
    E --> K[Authenticate & Select Workspace]
    K --> L[Resolve/Create Project]
    L --> M[Fetch Project Clusters]
    M --> N[User Selects Cluster]
    N --> O{Cluster Type?}
    O -->|Standard| P[Sync .hx files into project]
    O -->|Enterprise| Q[Sync .rs files into project]
    P --> R[Reconcile helix.toml]
    Q --> R
    R --> S[Update cloud/enterprise instances]
    
    D --> T{Instance Type?}
    T -->|Helix Cloud| U[Pull from cloud cluster]
    T -->|Enterprise| V[Pull from enterprise cluster]
    T -->|Local| W[Not implemented - warn user]
    U --> X[Fetch cluster metadata]
    X --> Y[Reconcile helix.toml]
    V --> Z[Fetch enterprise files]
    
    style R fill:#ff9999
    style S fill:#ff9999
    style Y fill:#ff9999
```
</details>


<sub>Last reviewed commit: a330ecb</sub>

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