…avidyz#286)

* fix(codecompanion): improve error handling for empty stderr output

- Enhanced flatten_table_to_string to filter out empty error messages
- Added logic to distinguish actual errors from empty stderr output
- Prevents false error reporting when VectorCode operations succeed but have no stderr
- Provides meaningful fallback error message for truly empty error conditions
- Fixes issue where successful operations with empty stderr were reported as { "" } errors

Resolves the confusing empty error message issue in CodeCompanion integration.

* refactor(nvim): cleanup `flatten_table_to_string`

* refactor(nvim): Simplify error handling in `query_tool`

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Co-authored-by: Zhe Yu <zcabzyu@ucl.ac.uk>

…avidyz#289)

* docs(nvim): fix type annotations

* refined docs

* Auto generate docs

* fix(nvim): Handle `nil` results

* refactor(nvim): Move `flatten_table_to_string` to `vectorcode.utils`

* fix(nvim): remove unused `require`

…yz#297)

* fix(nvim): Handle `nil` output for `jobrunner` in `check`

* Auto generate docs

* refactor(nvim): Use fallback in `flatten_table_to_string` for empty error

…vidyz#298)

* feat: support CodeCompanion `v18.0.0`

* fix: add compatibilty for older versions

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Co-authored-by: Davidyz <hzjlyz@gmail.com>