PyAutoScientist Phase 2: docs-build docs-only mode, CONTRIBUTING

[Jammy2211]

Summary

PyAutoScientist Phase 2 (PyAutoBrain/issues/68) — the Heart leg:

• docs-build.yml gains a docs-only mode (additive): new case pyautoscientist) repo=PyAutoBrain; deps=""; install=requirements and a conditional install step (pip install -r docs/requirements.txt instead of ./repo[optional,docs]). Existing callers (autoconf…autolens) take the unchanged install=package path. This lets PyAutoBrain — which has no pip package — reuse the centrally-defined docs check like every library.
• CONTRIBUTING.md (short pointer to the canonical policy in PyAutoBrain + the stability disclaimer).
• README: the RTD link line.

API Changes

None — additive CI config; no diffs to heart/ code, checks, config, or AGENTS.md.

Test Plan

• pytest tests/ — 244 passed
• Workflow YAML parses; existing callers' input contract unchanged (new case is additive)
• End-to-end proof: the companion PyAutoBrain PR's Docs check runs through this mode

Part of the 6-PR Phase 2 set.

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