Fold in round-2 public-readiness nice-to-haves

[dmccoystephenson]

Summary

Addresses the remaining actionable nice-to-haves from the round-2 public-readiness re-review (post-merge of #102), plus cleans up the last 4 stale, already-merged branches.

• README.md: Installation symlink now uses ln -sf, matching Step 5's own registration convention (create-dev-loop.md:624) instead of the plain ln -s it shipped with in Document install step; add ISSUE_TEMPLATE to doc sources table #102.
• CLAUDE.md: clarifies the ISSUE_TEMPLATE doc-table row — the *.md glob deliberately excludes config.yml, which has no restatable conventions.
• tests/test_check_docs.py: module docstring now notes that any new test class must reset check_docs.errors in its own setUp(), so a future addition doesn't silently leak state between tests.
• Deleted the last 4 stale, already-squash-merged branches (feature/add-research-md, feature/localization-and-command-sub-fixes, feature/rubric-based-self-review, license-mit) — all confirmed MERGED via gh pr list --state all --head <branch> before deletion. (7 of the original 11 flagged in round 1 had already been cleaned up by the time of this review.)

Not included, with reasons (both re-verified independently rather than assumed from the review):

• RESEARCH.md's "Observed effect: pending — needs N cycles of data" entries (PRs Bias triage and batching toward higher-merge-rate issue types #29/Add hard PR scope gates: LOC ceiling, do-not-auto-merge paths #30/Add documentation-accuracy and unit-test-expansion work-mode stages to Phase 2 #52/Apply consolidated template-rule backlog (#36, #39–#51) #54) — this needs real usage data only the maintainer can supply; there's nothing to mechanically edit without fabricating an observed effect.
• The flagged openai.com RESEARCH.md link — re-fetched independently, still returns 403 (not 404), consistent with bot/WAF blocking a non-browser client rather than a genuinely dead link. Left as-is; worth a manual browser check if you want to be certain.

Note: this repo's canonical location is now Stephenson-Software/create-dev-loop (transferred since round 1's review, which still referenced dmccoystephenson/create-dev-loop) — this PR and the branch deletions above target the canonical org.

Test plan

• python3 scripts/check_docs.py passes.
• python3 -m unittest discover -s tests -v — 13/13 pass.
• Verified all 4 deleted branches were MERGED via gh pr list --state all --head <branch> before deleting.
• Independently re-fetched the flagged RESEARCH.md link to confirm 403 vs. 404 before deciding not to touch it.

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