Rewrite REPO_POLICIES.md sentence by sentence (closes #136)

Every sentence of prompts/REPO_POLICIES.md is rewritten against the
sentence rules: one idea per sentence, about 30 words at most, lists as
bulleted lists, subject and verb early, the main rule before any
exception. No rule's meaning changed: nothing is added, removed,
loosened or tightened, every reason stays, and code blocks, digests,
URLs, file names, commands and quoted strings are unchanged. Both repo
checklists carry the same rewrite of the sentences they quote word for
word.

Model: fable-5-1

TODO.md

@@ -21,6 +21,13 @@ fmt-check, and commit.
 
 # Completed Steps
 
+- 2026-11-04: Rewrote `prompts/REPO_POLICIES.md` sentence by sentence
+  (https://git.eeqj.de/sneak/prompts/issues/136), on sneak's yes at
+  https://git.eeqj.de/sneak/prompts/issues/136#issuecomment-165193. Every rule
+  keeps its meaning and its place, and `must` and `should` stay as they were.
+  Long sentences are split, comma-chained lists are now bulleted lists, and
+  every reason stays. Code blocks, digests, URLs, file names, commands and
+  quoted strings are unchanged.
 - 2026-11-03: The canonical golangci-lint is now v2.15.0, still built with
   go1.27.0, so the `go` directive rule is unchanged (issue 142). Repositories
   pick this up on their next re-vendor. Each item in the canonical

prompts/EXISTING_REPO_CHECKLIST.md

@@ -1,6 +1,6 @@
 ---
 title: Existing Repo Checklist
-last_modified: 2026-11-03
+last_modified: 2026-11-04
 ---
 
 Use this checklist when beginning work in a repo that may not yet conform to our
@@ -105,37 +105,43 @@ with your task.
       `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
-      (`**/.git/config`, `**/.git/modules/**/config`): the repository's own,
-      each submodule's under `.git/modules/`, and that of a submodule keeping
-      its own `.git` directory. `git describe` does not need them, and each can
-      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
-      `git describe --tags --always`. That gives the tag on a tagged commit; on
-      a later commit, the tag, the number of commits since it and the short
-      commit (`v1.2.3-4-gabc1234`); and the short commit when no tag is
-      reachable. The stage that compiles also marks its working directory safe
-      for git (`git config --system --add safe.directory /src`): a context sent
-      as a tar stream keeps the sender's file owners, and git refuses a checkout
-      owned by another user, so the version would come out empty. `ARG VERSION`
-      has no default, and the build fails if the context carries `.git` and the
-      version still comes out empty, `dev` or `unknown`. A plain
-      `docker build .` with no build arguments must succeed; a Dockerfile that
-      refuses an empty build argument drops that refusal and keeps the argument.
-      A checkout whose `.git` is a file (a linked worktree, or a repository
-      checked out as a submodule) is the exception: that file points to a git
-      directory outside the build context, so the build cannot read the version
-      and a plain `docker build .` fails; pass the version with
-      `--build-arg VERSION=...`. `script/docker` and `script/cibuild` already
-      pass the version they compute on the host; it takes precedence. The
-      canonical `.gitea/workflows/check.yml` sets `fetch-depth: 0` on its
-      checkout step, which otherwise clones shallow and fetches no tags, so a CI
-      build finds the tag too.
+      (`**/.git/config`, `**/.git/modules/**/config`):
+    - the repository's own
+    - each submodule's under `.git/modules/`
+    - that of a submodule keeping its own `.git` directory
+
+    `git describe` does not need them, and each can hold a credential: a
+    password in a remote URL, or the token the CI checkout step stores there. A
+    submodule name may have a `config` segment, as in `config`, `deploy/config`
+    or `config/lib`. Such a submodule 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, and an alpine one needs
+    `apk add --no-cache git`. That stage takes the version from the `VERSION`
+    build argument when one is given, otherwise from
+    `git describe --tags --always`. That gives:
+    - the tag, on a tagged commit
+    - the tag, the number of commits since it and the short commit
+      (`v1.2.3-4-gabc1234`), on a later commit
+    - the short commit, when no tag is reachable
+
+    The stage that compiles also marks its working directory safe for git
+    (`git config --system --add safe.directory /src`). A context sent as a tar
+    stream keeps the sender's file owners, and git refuses a checkout owned by
+    another user, so the version would come out empty. `ARG VERSION` has no
+    default. The build fails if the context carries `.git` and the version still
+    comes out empty, `dev` or `unknown`. A plain `docker build .` with no build
+    arguments must succeed; a Dockerfile that refuses an empty build argument
+    drops that refusal and keeps the argument. A checkout whose `.git` is a file
+    is the exception: a linked worktree, or a repository checked out as a
+    submodule. That file points to a git directory outside the build context, so
+    the build cannot read the version and a plain `docker build .` fails. Pass
+    the version with `--build-arg VERSION=...`. `script/docker` and
+    `script/cibuild` already pass the version they compute on the host; it takes
+    precedence. The canonical `.gitea/workflows/check.yml` sets `fetch-depth: 0`
+    on its checkout step, which otherwise clones shallow and fetches no tags, so
+    a CI build finds the tag too.
+
 - [ ] Gitea Actions workflow in `.gitea/workflows/` runs `script/cibuild` on
       push, checks out with `persist-credentials: false` and with
       `fetch-depth: 0` (which fetches the tags `git describe` needs), carries

prompts/NEW_REPO_CHECKLIST.md

@@ -1,6 +1,6 @@
 ---
 title: New Repo Checklist
-last_modified: 2026-11-03
+last_modified: 2026-11-04
 ---
 
 Use this checklist when creating a new repository from scratch. Follow the steps
@@ -75,34 +75,42 @@ Template files can be fetched from:
       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
-      (`**/.git/config`, `**/.git/modules/**/config`): the repository's own,
-      each submodule's under `.git/modules/`, and that of a submodule keeping
-      its own `.git` directory. `git describe` does not need them, and each can
-      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
-      `git describe --tags --always`. That gives the tag on a tagged commit; on
-      a later commit, the tag, the number of commits since it and the short
-      commit (`v1.2.3-4-gabc1234`); and the short commit when no tag is
-      reachable. The stage that compiles also marks its working directory safe
-      for git (`git config --system --add safe.directory /src`): a context sent
-      as a tar stream keeps the sender's file owners, and git refuses a checkout
-      owned by another user, so the version would come out empty. `ARG VERSION`
-      has no default, and the build fails if the context carries `.git` and the
-      version still comes out empty, `dev` or `unknown`. A plain
-      `docker build .` with no build arguments must succeed; a Dockerfile that
-      refuses an empty build argument drops that refusal and keeps the argument.
-      A checkout whose `.git` is a file (a linked worktree, or a repository
-      checked out as a submodule) is the exception: that file points to a git
-      directory outside the build context, so the build cannot read the version
-      and a plain `docker build .` fails; pass the version with
-      `--build-arg VERSION=...`, as `script/docker` and `script/cibuild` already
-      do.
+      (`**/.git/config`, `**/.git/modules/**/config`):
+        - the repository's own
+        - each submodule's under `.git/modules/`
+        - that of a submodule keeping its own `.git` directory
+
+        `git describe` does not need them, and each can hold a credential: a
+        password in a remote URL, or the token the CI checkout step stores
+        there. A submodule name may have a `config` segment, as in `config`,
+        `deploy/config` or `config/lib`. Such a submodule 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, and an alpine one needs
+        `apk add --no-cache git`. That stage takes the version from the
+        `VERSION` build argument when one is given, otherwise from
+        `git describe --tags --always`. That gives:
+        - the tag, on a tagged commit
+        - the tag, the number of commits since it and the short commit
+          (`v1.2.3-4-gabc1234`), on a later commit
+        - the short commit, when no tag is reachable
+
+        The stage that compiles also marks its working directory safe for git
+        (`git config --system --add safe.directory /src`). A context sent as a
+        tar stream keeps the sender's file owners, and git refuses a checkout
+        owned by another user, so the version would come out empty.
+        `ARG VERSION` has no default. The build fails if the context carries
+        `.git` and the version still comes out empty, `dev` or `unknown`. A
+        plain `docker build .` with no build arguments must succeed; a
+        Dockerfile that refuses an empty build argument drops that refusal and
+        keeps the argument. A checkout whose `.git` is a file is the exception:
+        a linked worktree, or a repository checked out as a submodule. That file
+        points to a git directory outside the build context, so the build cannot
+        read the version and a plain `docker build .` fails. Pass the version
+        with `--build-arg VERSION=...`, as `script/docker` and `script/cibuild`
+        already do.
+
     - The Dockerfile carries a `lint` phase and a `test` phase, each invoking
       its tool directly rather than through `make` or `script/`, and the final
       stage carries a `COPY --from=` of a harmless file from each so the image
@@ -147,6 +155,7 @@ Template files can be fetched from:
     - Server: the final stage builds and runs the application
     - Non-server: the final stage brings up the dev environment
     - Image pinned by sha256 hash with version/date comment
+
 - [ ] Gitea Actions workflow at `.gitea/workflows/check.yml` that runs
       `script/cibuild` on push, checks out with `persist-credentials: false` and
       with `fetch-depth: 0` (which fetches the tags `git describe` needs),