Merge Repo hygiene: remove leaked internal working docs, retired validation-profiles, and the paper dir from the public root

Author: imaurer

.gitignore

@@ -12,12 +12,11 @@ site/
 .climb/
 .climb-test-vault/
 .march/*
-!.march/validation-profiles.toml
 .march-runtime/
 .claude/
 .agents/
 /planning/
-paper/generated/
+RELEASE-READINESS-*.md
 architecture/experiments/**/results/
 benchmarks/bioasq/datasets/raw/
 benchmarks/bioasq/datasets/normalized/

.march/validation-profiles.toml

@@ -10,7 +10,6 @@ tests/
 spec/
 docs/
 architecture/
-paper/
 benchmarks/
 examples/
 scripts/

.mcpbignore

@@ -71,9 +71,9 @@ HOOK
 chmod +x "$hook_path"
 ```
 
-The helper allows only `.march/code-review-log.md` and
-`.march/validation-profiles.toml` under `.march/`, and it permits staged
-deletions so cleanup commits can remove old March artifacts from tracking.
+The helper allows only `.march/code-review-log.md` under `.march/`, and it
+permits staged deletions so cleanup commits can remove old March artifacts from
+tracking.
 
 ### Timing Method