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: 6
Held back (source / dep-manifests): 6

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

Author: hyperpolymath

.gitignore

@@ -62,3 +62,10 @@ htmlcov/
 
 # Crash recovery artifacts
 ai-cli-crash-capture/
+target/
+node_modules/
+_build/
+deps/
+.elixir_ls/
+.cache/
+dist/

netstack/.gitignore

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

netstack/interface/.gitignore

@@ -1,2 +1,13 @@
 node_modules/
 lib/
+target/
+_build/
+deps/
+.elixir_ls/
+.cache/
+*.log
+*.tmp
+.DS_Store
+Thumbs.db
+build/
+dist/

netstack/orchestrator/.gitignore

@@ -35,3 +35,15 @@ flatracoon_orchestrator-*.tar
 npm-debug.log
 /assets/node_modules/
 
+target/
+node_modules/
+_build/
+deps/
+.elixir_ls/
+.cache/
+*.log
+*.tmp
+.DS_Store
+Thumbs.db
+build/
+dist/

netstack/tui/.gitignore

@@ -10,3 +10,14 @@ bin/
 *~
 *.swp
 .DS_Store
+target/
+node_modules/
+_build/
+deps/
+.elixir_ls/
+.cache/
+*.log
+*.tmp
+Thumbs.db
+build/
+dist/

os/.gitignore

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