docs: expand Help wanted section with five more good first issues

[cobusgreyling]

Summary

• Adds five rows to the README Help wanted table from the open good first issue backlog
• Fixes incorrect issue links (loop-sync → Add loop-sync subsection to QUICKSTART #226; story pair → Share your loop-worktree week-two story #229/Share your multi-loop failure story #230)

New items surfaced

Time	Issues
~15 min	#118 Daily Triage story · #119 PR Babysitter failure story
~20 min	#117 Continue.dev row in primitives matrix
~30 min	#221 Cursor Post-Merge Cleanup · #224 Cursor Issue Triage
~30 min	#195 Roo Code appendix · #196 GitHub Copilot appendix
~45 min	#231 loop-init validation checklist (paired with #225)
~1 hr	#173 Issue Triage week-one story

[github-actions]

Loop Readiness Audit

Score: 100/100 (L3)

Strong loop readiness — good candidate for L3 with explicit gates.

No suggestions — looking good.

_{Posted by audit.yml · loop-audit docs}