feat: remove -o env from search command

- Remove OutputMode::Env from output.rs
- Remove env output branch and shell_quote from search.rs
- Update docs (AGENTS.md, README.md, main.rs help)

Bump version to 0.7.5

Made-with: Cursor

src/main.rs

@@ -126,7 +126,7 @@ EXAMPLES:
         /// Secret entry: key=value, key:=<json>, key=@file, or nested:path@file
         #[arg(long = "secret", short = 's')]
         secrets: Vec<String>,
-        /// Output format: text (default on TTY), json, json-compact, env
+        /// Output format: text (default on TTY), json, json-compact
         #[arg(short, long = "output")]
         output: Option<String>,
     },
@@ -135,7 +135,7 @@ EXAMPLES:
     ///
     /// Supports fuzzy search (-q), exact lookup (--name), field extraction (-f),
     /// summary view (--summary), pagination (--limit / --offset), and structured
-    /// output (-o json / json-compact / env). When stdout is not a TTY, output
+    /// output (-o json / json-compact). When stdout is not a TTY, output
     /// defaults to json-compact automatically.
     #[command(after_help = "EXAMPLES:
   # Discover all records (summary, safe default limit)
@@ -157,9 +157,6 @@ EXAMPLES:
   secrets search -n refining --kind service --name gitea \\
     -f metadata.url -f metadata.default_org
 
-  # Export metadata as env vars (single record only)
-  secrets search -n refining --kind service --name gitea -o env
-
   # Inject decrypted secrets only when needed
   secrets inject -n refining --kind service --name gitea
   secrets run -n refining --kind service --name gitea -- printenv
@@ -207,7 +204,7 @@ EXAMPLES:
         /// Sort order: name (default), updated, created
         #[arg(long, default_value = "name")]
         sort: String,
-        /// Output format: text (default on TTY), json, json-compact, env
+        /// Output format: text (default on TTY), json, json-compact
         #[arg(short, long = "output")]
         output: Option<String>,
     },