Align Copilot process filter indentation in backend infra

[Copilot]

The Copilot backend filter block in ai-code-backends-infra.el had inconsistent indentation around the original filter call and notification tracking path. This did not affect execution, but it obscured the structure of the process filter logic.

• What changed

  • Reindented the set-process-filter lambda for the Copilot session path in ai-code-backends-infra.el.
  • Aligned the when orig-filter and with-current-buffer forms to reflect the actual control flow and nesting.

• Result

  • The filter reads as a two-step pipeline:
    1. delegate to the original process filter
    2. record meaningful output and linkify recent session output

• Updated shape

  (lambda (process output)
    ;; Call original filter first
    (when orig-filter
      (funcall orig-filter process output))
    ;; Then track activity for notifications
    (with-current-buffer (process-buffer process)
      (when (ai-code-backends-infra--output-meaningful-p output)
        (ai-code-backends-infra--note-meaningful-output))
      (ai-code-session-link--linkify-recent-output output)))

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Incorrect indentation in copilot filter function</issue_title>
<issue_description>## Location
ai-code-backends-infra.el:938-944

Severity

Low

Problem

The filter function for the "copilot" backend has misaligned indentation.

(when orig-filter
    (funcall orig-filter process output))  ; Wrong indentation
  ;; Then track activity for notifications
   (with-current-buffer (process-buffer process)  ; Wrong indentation

Impact

This doesn't affect execution (Emacs is whitespace-tolerant in let-bindings), but it's a formatting issue that makes the code harder to read.

Suggested Fix

Fix the indentation to follow standard Elisp conventions.</issue_description>

Comments on the Issue (you are @copilot in this section)

@tninja Thanks

• Fixes Incorrect indentation in copilot filter function #253

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