Migrate Jira NEON-* references to Linear NEO-* and linear.app links in
docs, Cursor rules, READMEs, and traceability comments. Renamed
implementation plans and dated reviews to NEO filenames.
Branch is based on origin/main with this commit only (no NEON-29
gameplay chain). client/README follows main’s district/map copy;
player.gd matches main aside from NEO-14 debug trace prefixes.
Link commit-and-review to jira-git-naming for story-scoped commits; clarify
jira-git-naming applies to commits done as part of a Jira issue; surface the
convention in AGENTS.md.