ci: add PR quality gate workflow and scoring engine

[Aishagojo]

No description provided.

[github-actions]

🔶 PR Quality Gate — Needs Attention (50/100)

This PR is close but needs a few fixes before entering the maintainer review queue (threshold: 65/100).

🟢 Low Risk — touches documentation, tests, or non-consensus code.

	Check	Score	Detail
✅	Component prefix	20/20	Found valid prefix: ci:
❌	PR description	0/20	No description — explain the problem, approach, and impact. Missing problem statement — what is broken or wrong?. Missing technical detail — mention file paths, function names, or specific values
⚠️	Commit message format	10/20	Vague or too-long subjects: "ci: add PR quality gate workflow and scoring engine", "feat: enhanced scorer with risk profiling, buzzword detection, three-lane routing and live Bitcoin Core labels"
❌	Diff size and focus	0/20	Large diff: 1451 changed lines across 6 files. Bitcoin Core prefers small reviewable PRs — split this up.
✅	Test coverage	20/20	No source files changed that require tests.
	Total	50/100

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What to Fix

AI feedback unavailable — API key not set.

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