first commit: echo server

.clang-format

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+# Style contract for this repo. Taken from the CPP modules, so both codebases
+# read the same way, with the Standard line corrected — see below.
+# Google as the base (2-space indent, K&R braces, west-const pointers).
+---
+Language: Cpp
+BasedOnStyle: Google
+
+# `Standard` only tells clang-format how to *parse* the source; it has nothing to
+# do with what the compiler is given. There is no `c++23` value — the enum stops
+# at `c++20` plus `Latest` and `Auto` (verified against clang-format 18.1.3:
+# c++23 rejected, c++20/Latest/Auto accepted), and an unknown value makes
+# clang-format refuse the whole file with "unknown enumerated scalar", not fall
+# back to a default. `Latest` is the value that means "the newest this binary
+# knows". The language standard is set once, in the Makefile: `-std=c++23`.
+Standard: Latest
+
+# 80 columns, straight from the Google C++ Style Guide ("Line Length"). This is
+# the dominant limit across C++ house styles: Google, LLVM, Chromium, Mozilla,
+# Abseil, folly. The 100 used by Rust/Kotlin/Qt is a newer-language convention
+# and does not carry over. Nothing to do with norminette, which is a C rule.
+ColumnLimit: 80
+
+IndentWidth: 2
+# Access specifiers get their own indent level: `public:` at 2, members at 4.
+IndentAccessModifiers: true
+
+# `T& name` / `T* name` — west style.
+PointerAlignment: Left
+ReferenceAlignment: Pointer
+
+# One-liner bodies allowed only for functions defined inside a class — trivial
+# accessors in headers. An out-of-line definition always gets a real body.
+# (The CPP modules use None; Google and LLVM both default to All. Inline is the
+# middle ground, and the only part of this file that deviates from them.)
+AllowShortFunctionsOnASingleLine: Inline
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+
+# Include order is deliberate (own header first, then std by topic) — don't shuffle.
+SortIncludes: false