Merge --count and --count-by into a single flag

[mepuka]

Problem

--count and --count-by are mutually exclusive but this isn't obvious:

skygent query arsenal-feed --count --count-by author
# Error: --count-by cannot be combined with --count.

Why this matters for agents

An agent might reasonably assume --count is a mode switch and --count-by adds grouping. The mutual exclusion is a minor friction point.

Proposed fix

Merge into a single --count [field] flag:

• --count alone → total count
• --count author → grouped by author
• --count hashtag → grouped by hashtag

This eliminates the mutual exclusion and simplifies the API surface.

[mepuka]

Triaged on 2026-03-04: still open and requires remediation.

Current behavior remains split:

• --count is a standalone boolean total-count mode.
• --count-by is a separate grouping flag.

The requested unified interface (count alone for total, count for grouped) is not implemented yet.

[mepuka]

Implemented on 2026-03-04 and verified by tests.

What changed:

• Query argv preprocessing now accepts merged count syntax:
  • count alone = total count
  • count with field (author, hashtag, date, hour) = grouped counts
• Added support for both count field syntaxes:
  • --count author
  • --count=author
• Existing count-by remains supported as a compatibility alias.
• Updated query help text/examples and README aggregation examples.
• Added argv tests for the new count normalization behavior.

Closing as resolved.