feat: polish doc-review strategy

[Gusarich]

closes #28

[Gusarich]

@codex review!

[chatgpt-codex-connector]

Codex Review: Here are some suggestions.

pitaya/src/orchestration/strategies/doc_review.py

Lines 70 to 75 in 1d98a34

	async def execute(
	self,
	prompt: str,
	base_branch: str,
	ctx: "StrategyContext",
	) -> List[InstanceResult]:

[P1] Preserve user prompt in reviewer prompts

The strategy still accepts a prompt argument but never uses it when building reviewer or validator prompts, whereas the previous version injected the original request into _build_reviewer_prompt. As a result the caller’s instructions (e.g. pitaya "Review docs for X" --strategy doc-review …) are silently ignored and the agents always receive the built‑in generic prompt. This removes the operator’s ability to scope or customize the review and can lead to incorrect or incomplete reports. Consider threading the user prompt back into the reviewer prompt or otherwise documenting that the argument is unused.

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