refactor: review-pr → review-code with superpowers + plugin-lifted improvements

Renamed review-pr → review-code (the skill accepts PR, SHA range,
current branch, staged changes — "pr" was understating scope).
Rewrote SKILL.md with YAML frontmatter (previously header-style) and
merged useful patterns from two sources:

From obra/superpowers skills/requesting-code-review:
  - Intent-vs-delivery grading (given plan/ADR/ticket)
  - Mandatory Strengths section (three minimum)
  - Per-issue Critical/Important/Minor severity (per-criterion
    PASS/WARN/FAIL retained; complementary axes)
  - Required verdict + 1-2 sentence reasoning
  - Multi-input support (PR / SHA range / current branch / --staged)
  - Sub-agent dispatch recommendation for heavy reviews
  - Concrete filled-in example output

From the claude-plugins-official code-review plugin:
  - Phase 0 eligibility gate (skip closed/draft/auto/trivial/already-reviewed)
  - CLAUDE.md traversal + adherence criterion (reads root + per-directory
    CLAUDE.md files; audits the diff against stated rules)
  - Multi-perspective Phase 2: five passes (CLAUDE.md adherence, shallow
    bug scan, git history context, prior PR comments, in-scope code
    comments). For large reviews, dispatch as parallel sub-agents.
  - Confidence filter (High/Medium/Low; drop Low before reporting)
  - False-positive categories explicitly enumerated (pre-existing issues
    on unmodified lines, lint/typecheck issues CI handles,
    senior-wouldn't-call-out nitpicks, silenced issues with valid reason,
    intentional scope changes, unmodified-line issues, framework-behavior
    tests)
  - Trust-CI discipline (don't run builds yourself)

Substance from the original review-pr kept verbatim:
  - DeepSat-specific criteria (security, TDD evidence, conventions,
    no-AI-attribution, API contracts, architecture layering, root-cause
    discipline)

Size: 60 lines → 347 lines. Growth is structural (added phases, added
example, added perspectives, added filters) not verbose — each section
earns its lines.

NOT adopted from the plugin:
  - GitHub comment output format (plugin posts PR comments; review-code
    outputs a markdown report the user can paste if they want)
  - "Generated with Claude Code" footer (violates no-AI-attribution rule)
  - Specific 0/25/50/75/100 confidence scale (Critical/Important/Minor
    covers the same signal with less ceremony)

Makefile SKILLS updated: review-pr → review-code. Old
~/.claude/skills/review-pr symlink removed; make install creates the
new one at ~/.claude/skills/review-code.

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