📦 NEW: Using LWC - Add durable project memory skill

[JanYork]

Description

Adds the complete MIT-licensed using-lwc skill for durable, source-grounded
project memory across coding-agent sessions. It combines bounded Wiki recall,
physical document relationships, and an independently verified CodeGraph plane.

Source: JanYork/using-lwc, imported
from immutable commit 7bd8052e6fa012786e50eee09f46df06b0cda1b8.

Use cases

• Recall verified project decisions and incident outcomes before re-deriving them.
• Explore document relationships and current-code callers/dependencies separately.
• Maintain durable project memory with explicit scope and authorization boundaries.

Testing

• skills-ref validate skills/using-lwc passed.
• Both shell helpers passed sh -n.
• The complete 22-file tree contains no symlinks.
• The same bundle passed the four-shard local suite, metadata validation,
  reference validation, and documentation security scan in its larger catalog submission.

Breaking changes

None.