fix: reclassify skill-only Technical Projects on current parser

[mergemaven11]

Closes #152.

Supersedes stale PR #188 while preserving the newer resume-import parser improvements already on main.

What changed

• Conservatively detect TECHNICAL PROJECTS sections that are actually skill label/value lists.
• Reclassify only those cases into Skills.
• Preserve legitimate project sections with project signals, dates, bullets, or descriptive prose.
• Reuse the shared skill-label vocabulary.
• Keep current work-history inference and role-header parsing behavior intact.

Regression coverage

• Skill-only Technical Projects -> Skills.
• Legitimate Incident Tracker/dashboard/API project remains Projects.
• Existing current parser regression suite remains in place.

Merge gate

Merge only if this exact head is current with main, Backend CI, Frontend CI, and Security CI are green, the PR is mergeable, and review threads are resolved.