perf: auto-populate git context natively to avoid token waste

- Added get_git_context() to utils.rs using git2 to natively fetch branch, commit, and repo_name without CLI overhead.
- Wired native auto-population into LogCodeChangeHandler, LogErrorFixHandler, TechDebtHandler, TasksHandler, MilestonesHandler, AutoSessionCheckpointHandler, and HandoffMemosHandler.
- Eliminates the need for the LLM to waste repetitive background turns running git rev-parse HEAD and git branch --show-current via terminal shell commands just to feed the MCP logging tools.

server/src/handlers/meta.rs

@@ -34,8 +34,8 @@ impl McpTool for LogErrorFixHandler {
                 signature: req.signature.clone(),
                 solution: solution.clone(),
                 timestamp: crate::handlers::utils::now_secs(),
-                git_commit: req.git_commit,
-                git_branch: req.git_branch,
+                git_commit: req.git_commit.or_else(|| crate::handlers::utils::get_git_context().1),
+                git_branch: req.git_branch.or_else(|| crate::handlers::utils::get_git_context().0),
                 embedding,
                 ..Default::default()
             });
@@ -203,17 +203,20 @@ impl McpTool for LogCodeChangeHandler {
             _ => crate::models::ChangeKind::Modified,
         };
 
+        let (auto_branch, auto_commit, auto_repo) = crate::handlers::utils::get_git_context();
+        let effective_repo = req.repo_name.clone().filter(|rn| !rn.trim().is_empty()).or(auto_repo.clone());
+
         let namespace = req
             .namespace
             .filter(|ns| !ns.trim().is_empty())
-            .or_else(|| req.repo_name.clone().filter(|rn| !rn.trim().is_empty()))
+            .or_else(|| effective_repo.clone())
             .unwrap_or_else(crate::models::default_namespace);
 
         let symbols = req.symbol_references.clone().unwrap_or_default();
         let line_range = req.line_range.clone();
 
-        let effective_rev = req.revision.clone().or_else(|| req.git_commit.clone());
-        let effective_branch = req.branch.clone().or_else(|| req.git_branch.clone());
+        let effective_rev = req.revision.clone().or_else(|| req.git_commit.clone()).or(auto_commit);
+        let effective_branch = req.branch.clone().or_else(|| req.git_branch.clone()).or(auto_branch);
         let detected_vcs = if let Some(vcs) = req.vcs_type.clone() {
             Some(vcs)
         } else if let Some(ref rev) = effective_rev {
@@ -248,7 +251,7 @@ impl McpTool for LogCodeChangeHandler {
                 description: description.clone(),
                 git_commit: effective_rev.clone(),
                 git_branch: effective_branch.clone(),
-                repo_name: req.repo_name,
+                repo_name: effective_repo,
                 repo_url: req.repo_url,
                 namespace: namespace.clone(),
                 change_kind,
@@ -629,10 +632,10 @@ impl McpTool for TechDebtHandler {
                         ideal_solution: ideal,
                         is_resolved: false,
                         created_at: crate::handlers::utils::now_secs(),
-                        git_commit: git_commit,
-                        git_branch: git_branch,
+                        git_commit: git_commit.or_else(|| crate::handlers::utils::get_git_context().1),
+                        git_branch: git_branch.or_else(|| crate::handlers::utils::get_git_context().0),
                         embedding,
-                        repo_name: repo_name,
+                        repo_name: repo_name.or_else(|| crate::handlers::utils::get_git_context().2),
                         severity: severity,
                         file_path: file_path,
                         line_range: line_range,
@@ -1823,6 +1826,8 @@ impl McpTool for AutoSessionCheckpointHandler {
             timestamp, active_tasks, unverified_hyp, recent_changes
         );
 
+        let (auto_branch, auto_commit, auto_repo) = crate::handlers::utils::get_git_context();
+
         let memo = crate::models::HandoffMemo {
             id: memo_id.clone(),
             author,
@@ -1830,6 +1835,9 @@ impl McpTool for AutoSessionCheckpointHandler {
             expires_at: None,
             namespace: req.namespace,
             timestamp,
+            git_branch: auto_branch,
+            vcs_revision: auto_commit,
+            repo_name: auto_repo,
             ..Default::default()
         };