docs: Split long shell commands with \ continuations

why: 6 commands in local checkout sections exceeded 80 chars, violating
the project's own shell formatting convention.
what:
- Split 3 long commands in docs/clients.md (claude, codex, gemini)
- Split matching 3 commands in README.md
- Each flag/value pair on its own indented continuation line

Author: tony

README.md

@@ -125,7 +125,11 @@ Point your tool at the local checkout via `uv --directory`:
 **Claude Code:**
 
 ```console
-$ claude mcp add --scope user libtmux -- uv --directory ~/work/python/libtmux-mcp run libtmux-mcp
+$ claude mcp add \
+    --scope user \
+    libtmux -- \
+    uv --directory ~/work/python/libtmux-mcp \
+    run libtmux-mcp
 ```
 
 <details>
@@ -134,13 +138,19 @@ $ claude mcp add --scope user libtmux -- uv --directory ~/work/python/libtmux-mc
 **Codex CLI:**
 
 ```console
-$ codex mcp add libtmux -- uv --directory ~/work/python/libtmux-mcp run libtmux-mcp
+$ codex mcp add libtmux -- \
+    uv --directory ~/work/python/libtmux-mcp \
+    run libtmux-mcp
 ```
 
 **Gemini CLI:**
 
 ```console
-$ gemini mcp add --scope user libtmux uv -- --directory ~/work/python/libtmux-mcp run libtmux-mcp
+$ gemini mcp add \
+    --scope user \
+    libtmux uv -- \
+    --directory ~/work/python/libtmux-mcp \
+    run libtmux-mcp
 ```
 
 **Cursor** — add to `~/.cursor/mcp.json`:

docs/clients.md

@@ -97,7 +97,11 @@ For live development, point your client at a local checkout via `uv --directory`
 **Claude Code:**
 
 ```console
-$ claude mcp add --scope user libtmux -- uv --directory ~/work/python/libtmux-mcp run libtmux-mcp
+$ claude mcp add \
+    --scope user \
+    libtmux -- \
+    uv --directory ~/work/python/libtmux-mcp \
+    run libtmux-mcp
 ```
 
 <details>
@@ -106,13 +110,19 @@ $ claude mcp add --scope user libtmux -- uv --directory ~/work/python/libtmux-mc
 **Codex CLI:**
 
 ```console
-$ codex mcp add libtmux -- uv --directory ~/work/python/libtmux-mcp run libtmux-mcp
+$ codex mcp add libtmux -- \
+    uv --directory ~/work/python/libtmux-mcp \
+    run libtmux-mcp
 ```
 
 **Gemini CLI:**
 
 ```console
-$ gemini mcp add --scope user libtmux uv -- --directory ~/work/python/libtmux-mcp run libtmux-mcp
+$ gemini mcp add \
+    --scope user \
+    libtmux uv -- \
+    --directory ~/work/python/libtmux-mcp \
+    run libtmux-mcp
 ```
 
 **Cursor** — add to `~/.cursor/mcp.json`: