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, 4 insertions, 4 deletions

diff --git a/internal/hexaicli/runner.go b/internal/hexaicli/runner.go
index eaae1cd..3929001 100644
--- a/internal/hexaicli/runner.go
+++ b/internal/hexaicli/runner.go
@@ -18,7 +18,7 @@ import (
 
 type cliConfigLoader func(context.Context, *log.Logger) appconfig.App
 
-type cliEditorOpener func([]byte) (string, error)
+type cliEditorOpener func(context.Context, []byte) (string, error)
 
 type cliClientFactory func(appconfig.App) (llm.Client, error)
 
@@ -85,7 +85,7 @@ func (r *Runner) Run(ctx context.Context, args []string, stdin io.Reader, stdout
 				}
 				cfgPath = p
 			}
-			if err := editor.OpenFile(cfgPath); err != nil {
+			if err := editor.OpenFile(ctx, cfgPath); err != nil {
 				_, _ = fmt.Fprintf(stderr, logging.AnsiBase+"hexai %s: %v"+logging.AnsiReset+"\n", sub, err)
 				return err
 			}
@@ -127,7 +127,7 @@ func (r *Runner) Run(ctx context.Context, args []string, stdin io.Reader, stdout
 
 	input, rerr := readInput(stdin, args)
 	if rerr != nil && len(args) == 0 {
-		if prompt, eerr := runner.openEditor(nil); eerr == nil && strings.TrimSpace(prompt) != "" {
+		if prompt, eerr := runner.openEditor(ctx, nil); eerr == nil && strings.TrimSpace(prompt) != "" {
 			args = []string{prompt}
 			input, rerr = readInput(stdin, args)
 		}
@@ -182,5 +182,5 @@ func normalizeRunner(r *Runner) Runner {
 }
 
 func loadConfigFromContext(ctx context.Context, logger *log.Logger) appconfig.App {
-	return appconfig.LoadWithOptions(logger, appconfig.LoadOptions{ConfigPath: configPathFromContext(ctx)})
+	return appconfig.LoadWithOptions(ctx, logger, appconfig.LoadOptions{ConfigPath: configPathFromContext(ctx)})
 }