Sprint B.7: secret scan before commit-push (TUI + CLI)

- src/secrets.rs: scans added lines of the staged diff for GitHub/GitLab
  token shapes, AWS access keys, Discord token assignments, private key
  blocks; prefix+tail-length matching (no regex dep), matched values never
  echoed
- a hit blocks the commit and unstages (git reset); CLI override
  --allow-secrets; TUI sync flow shares the same scan
- verified: block+unstage, override commits, prose mentions don't trigger

src/cli.rs

@@ -65,6 +65,8 @@ pub enum Commands {
         #[arg(long, default_value = "pull")] action: String,
         /// Commit message (required for commit-push)
         #[arg(short, long)] message: Option<String>,
+        /// Commit even when staged changes look like secrets
+        #[arg(long)] allow_secrets: bool,
     },
     /// Tag a release and publish it on the provider
     Release {

src/cli_cmds/mod.rs

@@ -30,8 +30,8 @@ pub async fn run(cmd: Commands, json: bool, guard: Guard, cfg: &AppConfig) -> Re
             workspace::list(cfg, json, dirty, behind, ahead, lang, project),
         Commands::Status { repo }   => workspace::status(cfg, json, &repo),
         Commands::Scan              => workspace::scan_cmd(cfg, json),
-        Commands::Sync { repos, all, project, action, message } =>
-            workspace::sync(cfg, guard, repos, all, project, &action, message),
+        Commands::Sync { repos, all, project, action, message, allow_secrets } =>
+            workspace::sync(cfg, guard, repos, all, project, &action, message, allow_secrets),
         Commands::Release { repo, tag, notes } =>
             remote::release(cfg, guard, &repo, &tag, &notes).await,
         Commands::Stats { period }  => workspace::stats(cfg, json, &period),

src/cli_cmds/workspace.rs

@@ -88,10 +88,11 @@ pub fn scan_cmd(cfg: &AppConfig, json: bool) -> Result<()> {
     Ok(())
 }
 
+#[allow(clippy::too_many_arguments)]
 pub fn sync(
     cfg: &AppConfig, guard: super::Guard,
     repos: Vec<String>, all: bool, project: Option<String>,
-    action: &str, message: Option<String>,
+    action: &str, message: Option<String>, allow_secrets: bool,
 ) -> Result<()> {
     use crate::activity::ActivityKind;
     use crate::util::git::{git_run, git_run_ok};
@@ -150,10 +151,19 @@ pub fn sync(
             }
             "commit_push" => {
                 git_run(&r.path, &["add", "-A"]);
-                git_run(&r.path, &["commit", "-m", &msg]);
-                let ok = git_run_ok(&r.path, &["push"]);
-                if ok { log_activity(ActivityKind::Push, &r.name, format!("vulp sync (commit+push: {msg})")); }
-                ok
+                let hits = if allow_secrets { vec![] } else { crate::secrets::scan_staged(&r.path) };
+                if !hits.is_empty() {
+                    eprintln!("   SECRETS in staged changes — commit blocked:");
+                    for h in &hits { eprintln!("     {} — {}", h.file, h.pattern); }
+                    eprintln!("   changes unstaged; re-run with --allow-secrets to override");
+                    git_run_ok(&r.path, &["reset", "-q"]);
+                    false
+                } else {
+                    git_run(&r.path, &["commit", "-m", &msg]);
+                    let ok = git_run_ok(&r.path, &["push"]);
+                    if ok { log_activity(ActivityKind::Push, &r.name, format!("vulp sync (commit+push: {msg})")); }
+                    ok
+                }
             }
             "push" => {
                 let ok = git_run_ok(&r.path, &["push"]);

src/hub/actions.rs

@@ -42,8 +42,16 @@ pub async fn run_sync_flow(repos: &[RepoSummary], targets: &[usize], action: &st
             "pull" => run_logged(&r.path, &["pull"], crate::activity::ActivityKind::Pull, &r.name),
             "commit_push" => {
                 git_run(&r.path, &["add", "-A"]);
-                git_run(&r.path, &["commit", "-m", commit_msg]);
-                run_logged(&r.path, &["push"], crate::activity::ActivityKind::Push, &r.name);
+                let hits = crate::secrets::scan_staged(&r.path);
+                if !hits.is_empty() {
+                    println!("  ✗ SECRETS in staged changes — commit blocked:");
+                    for h in &hits { println!("      {} — {}", h.file, h.pattern); }
+                    println!("    changes unstaged; fix them (or override via CLI --allow-secrets)");
+                    crate::util::git::git_run_ok(&r.path, &["reset", "-q"]);
+                } else {
+                    git_run(&r.path, &["commit", "-m", commit_msg]);
+                    run_logged(&r.path, &["push"], crate::activity::ActivityKind::Push, &r.name);
+                }
             }
             _ => run_logged(&r.path, &["push"], crate::activity::ActivityKind::Push, &r.name),
         }

src/main.rs

@@ -21,6 +21,7 @@ mod profile;
 mod projects;
 mod providers;
 mod release_info;
+mod secrets;
 mod status;
 mod todos;
 mod tui;

src/secrets.rs

@@ -0,0 +1,96 @@
+//! Staged-changes secret scanning, run before every vulp-driven commit+push
+//! (TUI sync flow and `vulp sync --action commit-push`). Matches the added
+//! lines of `git diff --cached` against known credential shapes; a hit
+//! blocks the commit (CLI override: `--allow-secrets`). Hand-rolled
+//! matchers — the shapes are simple prefixes, not worth a regex dependency.
+
+use std::path::Path;
+
+/// One detected secret: which file and which credential shape. The matched
+/// text itself is deliberately not carried anywhere — reporting a secret
+/// must not re-leak it into terminals or logs.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct SecretHit {
+    pub file:    String,
+    pub pattern: &'static str,
+}
+
+/// Scans the staged diff of `repo` (added lines only). Returns no hits when
+/// git itself fails — sync's own git calls will surface that error instead.
+pub fn scan_staged(repo: &Path) -> Vec<SecretHit> {
+    let out = std::process::Command::new("git")
+        .arg("-C").arg(repo)
+        .args(["diff", "--cached", "--no-color", "--unified=0"])
+        .output();
+    let Ok(out) = out else { return vec![] };
+    scan_diff(&String::from_utf8_lossy(&out.stdout))
+}
+
+/// Scans unified-diff text, reporting each (file, pattern) pair once.
+pub fn scan_diff(diff: &str) -> Vec<SecretHit> {
+    let mut hits: Vec<SecretHit> = Vec::new();
+    let mut file = String::from("?");
+    for line in diff.lines() {
+        if let Some(rest) = line.strip_prefix("+++ b/") {
+            file = rest.to_string();
+            continue;
+        }
+        if line.starts_with("+++") { continue; } // "+++ /dev/null"
+        let Some(added) = line.strip_prefix('+') else { continue };
+        if let Some(pattern) = line_secret(added) {
+            let hit = SecretHit { file: file.clone(), pattern };
+            if !hits.contains(&hit) { hits.push(hit); }
+        }
+    }
+    hits
+}
+
+/// The credential shape found in `line`, if any.
+fn line_secret(line: &str) -> Option<&'static str> {
+    if token_after_prefix(line, "ghp_", 20)        { return Some("GitHub token (ghp_…)"); }
+    if token_after_prefix(line, "github_pat_", 20) { return Some("GitHub fine-grained token"); }
+    if token_after_prefix(line, "glpat-", 10)
+        || token_after_prefix(line, "glpat_", 10)  { return Some("GitLab token (glpat…)"); }
+    if aws_access_key(line)                        { return Some("AWS access key (AKIA…)"); }
+    if discord_token_assignment(line)              { return Some("Discord token assignment"); }
+    if line.contains("-----BEGIN") && line.contains("PRIVATE KEY") {
+        return Some("private key block");
+    }
+    None
+}
+
+/// Whether `prefix` occurs followed by at least `min_tail` token characters
+/// — filters out prose/code that merely mentions the prefix.
+fn token_after_prefix(line: &str, prefix: &str, min_tail: usize) -> bool {
+    let mut search = 0;
+    while let Some(i) = line[search..].find(prefix) {
+        let after = &line[search + i + prefix.len()..];
+        let tail = after.chars()
+            .take_while(|c| c.is_ascii_alphanumeric() || *c == '_' || *c == '-')
+            .count();
+        if tail >= min_tail { return true; }
+        search += i + prefix.len();
+    }
+    false
+}
+
+/// `AKIA` followed by 16 uppercase alphanumerics (AWS access key ID shape).
+fn aws_access_key(line: &str) -> bool {
+    let mut search = 0;
+    while let Some(i) = line[search..].find("AKIA") {
+        let abs = search + i;
+        let tail = line[abs + 4..].chars()
+            .take_while(|c| c.is_ascii_uppercase() || c.is_ascii_digit())
+            .count();
+        if tail >= 16 { return true; }
+        search = abs + 4;
+    }
+    false
+}
+
+/// A `DISCORD_TOKEN = <value>` style assignment (any spacing around `=`).
+fn discord_token_assignment(line: &str) -> bool {
+    line.find("DISCORD_TOKEN")
+        .map(|i| line[i + "DISCORD_TOKEN".len()..].trim_start().starts_with('='))
+        .unwrap_or(false)
+}