Fold the August fleet findings into the policies, or drop them (closes #62)

Two findings from 2026-08-09 were rules a repository must follow that
`prompts/REPO_POLICIES.md` did not yet state, and are now added where a
reader would look: a new or changed check is proven by planting a defect
it must catch; and a change to a separate workflow limited to `main` by
a `branches` list is first run from the feature branch, added to that
list and removed again before merging. The issue records why every
other finding was dropped. The warning against `golangci-lint config
verify` is dropped because sneak ruled on
#40 (2026-08-10) that there is
no config check step and the config is assumed valid; a vendored
`.golangci.yml` stays byte-identical to the canonical copy.

Model: opus-5-5

.dockerignore

@@ -18,16 +18,9 @@
 # does not need .git/config; that file can hold a credential, such as a
 # password in a remote URL or the token the CI checkout step stores there.
 # Each submodule keeps a config with the same exposure in its git directory
-# under .git/modules/, nested again for a submodule's own submodules, or in
+# under .git/modules/, nested again for a submodule's own submodules.
-# its own .git directory when it keeps one.
+.git/config
-# KNOWN GAP: a submodule whose name has a `config` segment (`config`,
+.git/modules/**/config
-# `deploy/config`, `config/lib`) loses its whole git directory, because
-# `**/.git/modules/**/config` also matches that segment's directory
-# under .git/modules/. Go's version stamping then fails the build;
-# nothing leaks. Name such a submodule without that segment:
-# `git submodule add --name`.
-**/.git/config
-**/.git/modules/**/config
 
 # Agent scratch: one full checkout of the repo per in-flight agent.
 # Anchored because it occurs once where agents run at the repo root.

.gitattributes

@@ -1,4 +0,0 @@
-# Every PR adds an entry at the top of TODO.md's Completed Steps; union keeps
-# both sides instead of conflicting. Git never reports a conflict here: read
-# the merged entries after every merge or rebase.
-TODO.md merge=union

TODO.md

@@ -32,23 +32,6 @@ fmt-check, and commit.
   https://git.eeqj.de/sneak/prompts/issues/40 (2026-08-10) that there is no
   config check step and the config is assumed valid; a vendored `.golangci.yml`
   stays byte-identical to the canonical copy. The issue gives each reason.
-- 2026-10-04: Added a root `.gitattributes` that merges `TODO.md` with git's
-  union merge (issue 98), so two branches that each add an entry at the top of
-  Completed Steps merge without a conflict. Git now never reports a conflict in
-  `TODO.md`: a real conflict elsewhere keeps both versions of the line, and when
-  two new entries share an identical line, one is inserted into the middle of
-  the other, which a rebase can do to an entry already on `next`. Read the
-  merged entries after every merge or rebase. This applies to this repository
-  only; no canonical file changed.
-- 2026-10-04: The canonical `.dockerignore` now also keeps out the git `config`
-  of a submodule that keeps its own `.git` directory, which still reached the
-  image (issue 88): both git patterns now carry the `**/` prefix. A submodule
-  whose name has a `config` segment (`config`, `deploy/config`, `config/lib`)
-  still loses its whole git directory, so Go's version stamping fails the build;
-  the file records this as a `KNOWN GAP:` with the remedy,
-  `git submodule add --name`. Closing it would take a wildcard re-include, which
-  makes BuildKit walk every excluded directory, such as `node_modules`, on every
-  build. `REPO_POLICIES.md` and both checklists say so in the same words.
 - 2026-10-04: The note under the canonical Go `Dockerfile` example in
   `REPO_POLICIES.md` now installs lint-phase system libraries with `apt-get`
   under their Debian package names (issue 83). The `golangci/golangci-lint`

prompts/EXISTING_REPO_CHECKLIST.md

@@ -63,15 +63,10 @@ with your task.
       here run anywhere other than the repo root, the anchored entry misses
       `services/api/.claude/`: add anchored entries for those directories.
 - [ ] If the repo embeds a version in a binary: `.dockerignore` lets `.git` into
-      the build context. It keeps out every git `config` at any depth
+      the build context. It keeps out `.git/config` and each submodule's
-      (`**/.git/config`, `**/.git/modules/**/config`): the repository's own,
+      `config` under `.git/modules/` at any depth (`.git/modules/**/config`),
-      each submodule's under `.git/modules/`, and that of a submodule keeping
+      which `git describe` does not need and which can hold a credential: a
-      its own `.git` directory. `git describe` does not need them, and each can
+      password in a remote URL, or the token the CI checkout step stores there.
-      hold a credential: a password in a remote URL, or the token the CI
-      checkout step stores there. A submodule whose name has a `config` segment
-      (`config`, `deploy/config`, `config/lib`) loses its whole git directory to
-      `**/.git/modules/**/config`, and Go's version stamping then fails the
-      build: give it a name without that segment (`git submodule add --name`).
       The stage that compiles has `git` (the Debian Go image has it; an alpine
       one needs `apk add --no-cache git`) and takes the version from the
       `VERSION` build argument when one is given, otherwise from

prompts/NEW_REPO_CHECKLIST.md

@@ -71,15 +71,10 @@ Template files can be fetched from:
       will run them in subdirectories, `services/api/.claude/` needs its own
       anchored entry.
     - If the image embeds a version in a binary: `.dockerignore` lets `.git`
-      into the build context. It keeps out every git `config` at any depth
+      into the build context. It keeps out `.git/config` and each submodule's
-      (`**/.git/config`, `**/.git/modules/**/config`): the repository's own,
+      `config` under `.git/modules/` at any depth (`.git/modules/**/config`),
-      each submodule's under `.git/modules/`, and that of a submodule keeping
+      which `git describe` does not need and which can hold a credential: a
-      its own `.git` directory. `git describe` does not need them, and each can
+      password in a remote URL, or the token the CI checkout step stores there.
-      hold a credential: a password in a remote URL, or the token the CI
-      checkout step stores there. A submodule whose name has a `config` segment
-      (`config`, `deploy/config`, `config/lib`) loses its whole git directory to
-      `**/.git/modules/**/config`, and Go's version stamping then fails the
-      build: give it a name without that segment (`git submodule add --name`).
       The stage that compiles has `git` (the Debian Go image has it; an alpine
       one needs `apk add --no-cache git`) and takes the version from the
       `VERSION` build argument when one is given, otherwise from

prompts/REPO_POLICIES.md

@@ -251,16 +251,11 @@ style conventions are in separate documents:
             && rm -rf /var/lib/apt/lists/*
         ```
 
-    - `.dockerignore` lets `.git` into the build context. It keeps out every git
+    - `.dockerignore` lets `.git` into the build context. It keeps out
-      `config` at any depth (`**/.git/config`, `**/.git/modules/**/config`): the
+      `.git/config` and each submodule's `config` under `.git/modules/` at any
-      repository's own, each submodule's under `.git/modules/`, and that of a
+      depth (`.git/modules/**/config`), which `git describe` does not need and
-      submodule keeping its own `.git` directory. `git describe` does not need
+      which can hold a credential: a password in a remote URL, or the token the
-      them, and each can hold a credential: a password in a remote URL, or the
+      CI checkout step stores there. The stage that compiles has `git` (the
-      token the CI checkout step stores there. A submodule whose name has a
-      `config` segment (`config`, `deploy/config`, `config/lib`) loses its whole
-      git directory to `**/.git/modules/**/config`, and Go's version stamping
-      then fails the build: give it a name without that segment
-      (`git submodule add --name`). The stage that compiles has `git` (the
       Debian Go image has it; an alpine one needs `apk add --no-cache git`) and
       takes the version from the `VERSION` build argument when one is given,
       otherwise from `git describe --tags --always`. That gives the tag on a