Thread context.Context through blocking I/O entry points

Accept ctx as the first parameter on the blocking I/O entry points and
propagate it to downstream blocking calls so the work is cancellable from
the process entry point:

- appconfig.Load / LoadWithOptions: honor ctx before the blocking file
  reads, returning defaults on a cancelled context.
- LSP: lsp.Server.Run(ctx) ties the serve loop to the caller context via a
  new watchParentContext bridge (cancels the server context, aborting
  in-flight LLM work). Threaded through hexailsp.Run/RunWithConfig/
  RunWithFactory and runtimeconfig.Store.Reload.
- MCP: mcp.Server.Run(ctx) stops accepting requests once ctx is cancelled;
  threaded through hexaimcp.Run/RunWithFactory/RunBackfill.
- editor: RunEditor/OpenTempAndEdit/OpenFile take ctx and use
  exec.CommandContext so a cancelled context kills the editor subprocess;
  threaded through hexaicli, hexaiaction and askcli call sites.

Top-level callers (cmd/hexai-lsp-server, cmd/hexai-mcp-server) now build a
signal-cancelled context (SIGINT/SIGTERM) so shutdown tears the run down
cleanly. Updated comments to explain the cancellation flow and added
cancellation tests for the LSP/MCP loops, editor, and config load.

All tests pass with -race; cross-package coverage 86.2%.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/cmd/hexai-lsp-server/main.go b/cmd/hexai-lsp-server/main.go
index 03e2546..ed3af42 100644
--- a/cmd/hexai-lsp-server/main.go
+++ b/cmd/hexai-lsp-server/main.go
@@ -2,12 +2,15 @@
 package main
 
 import (
+	"context"
 	"flag"
 	"fmt"
 	"log"
 	"os"
+	"os/signal"
 	"path/filepath"
 	"strings"
+	"syscall"
 
 	"codeberg.org/snonux/hexai/internal"
 	"codeberg.org/snonux/hexai/internal/appconfig"
@@ -26,8 +29,13 @@ func main() {
 		return
 	}
 
+	// Cancel the run when the process receives an interrupt/terminate signal so
+	// the LSP serve loop and any in-flight LLM requests are torn down cleanly.
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
 	path := strings.TrimSpace(*configPath)
-	if err := hexailsp.RunWithConfig(*logPath, path, os.Stdin, os.Stdout, os.Stderr); err != nil {
+	if err := hexailsp.RunWithConfig(ctx, *logPath, path, os.Stdin, os.Stdout, os.Stderr); err != nil {
 		log.Fatalf("server error: %v", err)
 	}
 }