feat: swap from gpt-5 to gpt-5-mini for 80% savings per token (do not merge)

[aaronsteers]

Migrates from gpt-5 to gpt-5-mini.

Current blocker:

• Hard failure due to too-long input context on some prompts. (No easy fix to this.)

[github-actions]

PyTest Results (Fast)

0 tests  ±0   0 ✅ ±0   0s ⏱️ ±0s
0 suites ±0   0 💤 ±0 
0 files   ±0   0 ❌ ±0 

Results for commit 07dda0a. ± Comparison against base commit b03e56f.

♻️ This comment has been updated with latest results.

[github-actions]

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Testing This Branch via MCP

To test the changes in this specific branch with an MCP client like Claude Desktop, use the following configuration:

{
  "mcpServers": {
    "connector-builder-mcp-dev": {
      "command": "uvx",
      "args": ["--from", "git+https://github.com/airbytehq/connector-builder-mcp.git@feat--swap-from-gpt-5-to-gpt-5-mini-for-80%-savings", "connector-builder-mcp"]
    }
  }
}

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# Run the CLI from this branch:
uvx 'git+https://github.com/airbytehq/connector-builder-mcp.git@feat--swap-from-gpt-5-to-gpt-5-mini-for-80%-savings#egg=airbyte-connector-builder-mcp' --help

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