chore: estate-wide chore + stale-path sweep (2026-04-17)

Part of the estate-wide 2026-04-17 cleanup pass. Commits chore-safe
content only: docs, workflow YAML, gitignore, a2ml migration drift,
editorconfig, ncl. Dependency manifests (Cargo.toml/.lock, package.json,
mix.exs, etc.) and source files intentionally held back so no broken
intermediate states where a .rs commit splits from its Cargo.toml.

Also includes stale-path fixes for four ecosystem moves:
  hypatia       -> verification-ecosystem/hypatia
  echidna       -> verification-ecosystem/echidna
  ephapax       -> developer-ecosystem/nextgen-languages/ephapax
  panic-attacker -> games-ecosystem/panic-attacker

Staged files: 5
Held back (source / dep-manifests): 0

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.gitignore

@@ -119,3 +119,10 @@ htmlcov/
 *.bak
 # asdf version manager
 .tool-versions
+node_modules/
+_build/
+deps/
+.elixir_ls/
+.cache/
+build/
+dist/

lazy-eliminator/.gitignore

@@ -18,3 +18,13 @@ Thumbs.db
 
 # Output
 *.trace.json
+target/
+node_modules/
+_build/
+deps/
+.elixir_ls/
+.cache/
+*.log
+*.tmp
+build/
+dist/

satellite-template/.gitignore

@@ -50,3 +50,11 @@ htmlcov/
 # Vexometer traces (keep examples)
 /vexometer/*.json
 !/vexometer/example-*.json
+target/
+node_modules/
+_build/
+deps/
+.elixir_ls/
+.cache/
+build/
+dist/

vexometer/.gitignore

@@ -83,3 +83,11 @@ htmlcov/
 
 # Repo-local verisim sidecar runtime state
 /.verisim-local/
+target/
+node_modules/
+_build/
+deps/
+.elixir_ls/
+.cache/
+build/
+dist/

vext/.gitignore

@@ -77,3 +77,11 @@ htmlcov/
 /tmp/
 *.tmp
 *.bak
+target/
+node_modules/
+_build/
+deps/
+.elixir_ls/
+.cache/
+build/
+dist/