feat: add --temperature CLI flag (default 0)

[Priyansh2116]

Summary

Closes #1

• Adds a --temperature Click option (float, default 0.0, shown in --help) to the CLI
• Stores temperature on both AnthropicClient and OpenAIClient and uses it in generate()
• Threads it through make_client() so both the SQL-generator and selector LLM respect the flag
• Behaviour is completely unchanged when --temperature is omitted (default 0 preserves existing determinism)

Test plan

• promptquery --help shows --temperature FLOAT Sampling temperature passed to the LLM (0 = deterministic). [default: 0.0]
• Existing tests pass (pytest tests/)
• --temperature 0.7 forwards the value to the LLM API call

🤖 Generated with Claude Code

[Cyberfilo]

Thanks @Priyansh2116 — clean, and default=0.0 keeping determinism intact is exactly right for this project (reproducible SQL is a feature here).

Two technical things before I pull it in:

1. Range validation. type=float accepts anything, but the value goes straight to providers with different valid domains — Anthropic rejects temperature > 1, OpenAI allows up to 2. Today --temperature 5 reaches the API and fails with a provider error the user can't decode. Could you switch to type=click.FloatRange(0.0, 2.0)? That turns an opaque 400 into a clean CLI message.

2. Reasoning-model branch. In OpenAIClient.generate, the GPT-5.x / o1 / o3 path sets max_completion_tokens and never adds temperature to kwargs — so the flag is silently ignored there (correct, those models reject it). Could you drop a one-line comment so the next reader doesn't "fix" it?

Heads-up on a seam: #7 (Ollama) currently hardcodes temperature=0, so once both land we'll want to thread the flag there too for consistency — not this PR's job, just flagging it. Ticking your test-plan boxes (or pasting the --help output) would let me green-light faster. 👍

[Priyansh2116]

Thanks for the detailed review!

1. Range validation — switched to type=click.FloatRange(0.0, 2.0). Clean CLI error now instead of a provider 400.
2. Reasoning-model comment — added # self.temperature is intentionally not forwarded here. on the line after the existing comment so the next reader understands the omission is deliberate.

Both changes are in the latest commit. Happy to thread the flag into the Ollama client (#7) in a follow-up once that PR lands.