Add IBM Informix plugin to registry

[danielnuld]

Adds the IBM Informix driver plugin to plugins/registry.json.

• Repo: https://github.com/danielnuld/tabularis-informix-plugin (Apache-2.0)
• What it does: connects Tabularis to IBM Informix 11.70+ via the IBM Informix ODBC driver (odbc-api). Covers metadata (tables, columns, indexes, foreign keys, views, routines), query execution with SKIP/FIRST pagination, row CRUD (with a composite-PK safety guard), and DDL generation. 44 unit tests for the pure logic; validated end-to-end against a real Informix 11.70 server.
• Runtime requirement: the IBM Informix Client SDK (CSDK) must be installed on the host (provides the ODBC driver). Documented in the README.
• Platforms: Windows for now (win-x64). The plugin's bitness must match the installed Informix ODBC driver; a 32-bit build (win-x86) is also published on the GitHub Release for the common 32-bit CSDK, and the README explains how to pick it.

Release assets verified downloadable (HTTP 200). Modeled the entry on the existing db2 plugin.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (1 file)

• plugins/registry.json - Clean addition of IBM Informix plugin entry

The new entry follows the existing registry schema and conventions, including the correct structure (id, name, description, author, homepage, latest_version, releases). The latest_version matches the release version, min_tabularis_version aligns with the similarly-modeled db2 plugin, and the asset URL format is consistent. The single-platform (win-x64) asset is intentional and clearly documented in the PR description. No issues found.

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_{Reviewed by kimi-k2.6-20260420 · Input: 66.3K · Output: 1.2K · Cached: 79.7K}