fix: improve ResolvePartialID / ResolveID handling for bd show (issue #336)

- Add fast path for exact ID matches in ResolvePartialID
- Properly unmarshal ResolveID RPC responses used by `bd show`

Summary:
--------
Fixes regression introduced after v0.23.1 where `bd show <issue_id>`,
`bd update <issue_id>`, and `bd close <issue_id>` commands failed with
"operation failed: issue not found" errors even when the issue existed
in the database.

Root Cause:
-----------
The daemon's ResolveID RPC handler (handleResolveID in
internal/rpc/server_issues_epics.go) returns a JSON-encoded string
containing the resolved issue ID. For example, when resolving "ao-izl",
the RPC response contains the JSON string: "ao-izl" (with quotes).

After v0.23.1, the show/update/close commands in cmd/bd/show.go were
changed to use string(resp.Data) to extract the resolved ID, which
treats the raw bytes as a string without decoding the JSON. This caused
the resolved ID to literally be "ao-izl" (including the quotes),
which then failed to match the actual issue ID ao-izl (without quotes)
when passed to subsequent Show/Update/Close RPC calls.

In v0.23.1 (commit 77dcf55), the code correctly unmarshaled the JSON:
  var resolvedID string
  if err := json.Unmarshal(resp.Data, &resolvedID); err != nil {
      // handle error
  }

This unmarshal step was removed in later commits, causing the regression.

Fix:
----
Restored the JSON unmarshaling step in three places in cmd/bd/show.go:
1. showCmd - line 37-42
2. updateCmd - line 400-405
3. closeCmd - line 723-728

Each now properly decodes the JSON string response before using the
resolved ID in subsequent RPC calls.

Testing:
--------
- Verified `bd show <issue-id-with-prefix>` works correctly in both daemon and direct modes
- Tested with newly created issues to ensure the fix works for all IDs
- All Go tests pass (go test ./... -short)
- Confirmed behavior matches v0.23.1 working binary

The fix ensures that issue ID resolution works correctly regardless of
whether the ID prefix matches the configured issue_prefix.

cmd/bd/show.go

@@ -34,7 +34,12 @@ var showCmd = &cobra.Command{
 					fmt.Fprintf(os.Stderr, "Error resolving ID %s: %v\n", id, err)
 					os.Exit(1)
 				}
-				resolvedIDs = append(resolvedIDs, string(resp.Data))
+				var resolvedID string
+				if err := json.Unmarshal(resp.Data, &resolvedID); err != nil {
+					fmt.Fprintf(os.Stderr, "Error unmarshaling resolved ID: %v\n", err)
+					os.Exit(1)
+				}
+				resolvedIDs = append(resolvedIDs, resolvedID)
 			}
 		} else {
 			// In direct mode, resolve via storage
@@ -392,7 +397,12 @@ var updateCmd = &cobra.Command{
 					fmt.Fprintf(os.Stderr, "Error resolving ID %s: %v\n", id, err)
 					os.Exit(1)
 				}
-				resolvedIDs = append(resolvedIDs, string(resp.Data))
+				var resolvedID string
+				if err := json.Unmarshal(resp.Data, &resolvedID); err != nil {
+					fmt.Fprintf(os.Stderr, "Error unmarshaling resolved ID: %v\n", err)
+					os.Exit(1)
+				}
+				resolvedIDs = append(resolvedIDs, resolvedID)
 			}
 		} else {
 			var err error
@@ -710,7 +720,12 @@ var closeCmd = &cobra.Command{
 					fmt.Fprintf(os.Stderr, "Error resolving ID %s: %v\n", id, err)
 					os.Exit(1)
 				}
-				resolvedIDs = append(resolvedIDs, string(resp.Data))
+				var resolvedID string
+				if err := json.Unmarshal(resp.Data, &resolvedID); err != nil {
+					fmt.Fprintf(os.Stderr, "Error unmarshaling resolved ID: %v\n", err)
+					os.Exit(1)
+				}
+				resolvedIDs = append(resolvedIDs, resolvedID)
 			}
 		} else {
 			var err error