Fix --missing flag ignored when using --assignment filter

[Copilot]

The --missing flag only worked with --assignment-group (-A) and --module (-M), but was silently ignored when filtering by individual assignments (-a), always returning grades instead.

Changes

Modified summarize_assignments() in results.nw:

• Added conditional branch to check args.missing flag
• When set, iterates through courses and invokes missing_assignments() function (same logic as assignment groups)
• Outputs format: <course> <assignment> <login_id> <assignment> <reason>
• Assignment name appears as both "component" and "missing item" to maintain CSV format consistency with groups/modules

Updated help text:

• Changed "This option only has effect when working with assignment groups" → "Works with assignment groups, modules, and individual assignments"

Example usage now supported

# Previously ignored --missing, returned grades
canvaslms results -M -a "Lab 1" -c "CS101"

# Now correctly returns missing results
# Output: CS101,Lab 1,student@edu,Lab 1,not submitted

Note: Uses login_id for missing results (student contact) vs integration_id for grades (system export) per existing convention in assignment groups.

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Using --assignment causes --missing to be ignored when retrieving results</issue_title>
<issue_description>When trying to retrieve missing results from a specific assignment (and not an assignment group) with "canvaslms results -M -a ASSIGNMENT" the -M or --missing flag is ignored and we instead receive passing grades.

expected result:
expected would be for results to work the same with the -a "assignment" flag as it does with the -A "group" flag;
Returning the missing results in the form of " "

actual result:
We receive passing grades for the submissions of the assignment, the same as if we didn't include the -M / --missing flag in the other format: " <graders ...>"

</issue_description>

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

• Fixes Using --assignment causes --missing to be ignored when retrieving results #253

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