Add .editorconfig, broaden .gitignore, drop dead Drone refs (closes #72)

Add the canonical .editorconfig from sneak/prompts verbatim. Broaden .gitignore to cover secrets (.env, .env.*, *.key, *.pem), OS files, editor files, and Go artifacts while keeping every repo-specific entry; no tracked file becomes ignored, and bin/gitrev.sh stays tracked despite the /bin/ rule. Remove the stale .drone.yml ignore entry and the DRONE_COMMIT_SHA branch from bin/gitrev.sh, left from the Gitea Actions migration; the GITREV and git-describe paths still work.

A reader may trip over .editorconfig saying four spaces for every file while Go files are tab-indented: gofmt governs Go, editorconfig does not, and the file is taken verbatim by policy.

Disclosure: the worker's cold docker build hit the 10s test timeout in the gpg signature test; this change has no Go code, and that timeout is tracked by issues 67 and 62.

Model: opus-4-8 (implementation); fable-5-1 (merge)

.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[Makefile]
+indent_style = tab

.gitignore

@@ -10,5 +10,24 @@ modcache.tzst
 # Generated manifest files
 .index.mf
 
-# Stale files
-.drone.yml
+# Secrets
+.env
+.env.*
+*.key
+*.pem
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Editor files
+*.swp
+*.swo
+*~
+.idea/
+.vscode/
+
+# Go build artifacts
+*.log
+*.out
+*.test

TODO.md

@@ -24,6 +24,9 @@ only thing left of the `chore/align-repo-policies` branch is the list below.
 
 # Completed Steps
 
+- 2026-09-21: added the canonical `.editorconfig`, made `.gitignore` cover
+  secrets, OS, editor, and Go artifacts, and removed the dead Drone CI
+  references from `.gitignore` and `bin/gitrev.sh` (#72)
 - 2026-08-09: added `.prettierrc`/`.prettierignore`, gave `script/fmt` and
   `script/fmt-check` one shared prettier file set via `script/prettier`, dropped
   the `|| true` that hid prettier failures, and added a node-based Dockerfile

bin/gitrev.sh

@@ -1,10 +1,5 @@
 #!/bin/bash
 #
-if [[ ! -z "$DRONE_COMMIT_SHA" ]]; then
-    echo "${DRONE_COMMIT_SHA:0:7}"
-    exit 0
-fi
-
 if [[ ! -z "$GITREV" ]]; then
     echo $GITREV
 else