t.0vy: finalize empty-list stats footer behavior

[cs3b]

📋 Summary

• Reviewing and validating the empty-state output is easier now because ace-task list consistently shows the stats footer even when filters produce no tasks, so reviewers still see global context (0 of N and folder totals).
• Before this, empty-result output had two pain points: the footer could disappear on empty task lists, and fully empty status maps could render awkward spacing in the support formatter.
• This PR removes that friction by unifying empty/non-empty footer rendering in ace-task, hardening zero-status formatting in ace-support-items, and finalizing release/task metadata for the shipped behavior.

✏️ Changes

• TaskDisplayFormatter.format_list: consolidated empty and non-empty list rendering through one shared stats-line return path, keeping footer behavior consistent.
• StatsLineFormatter: fixed zero-status formatting so empty summaries render as Tasks: • 0 total without malformed spacing.
• Regression tests: added/expanded command and formatter coverage to lock empty-list footer output and folder summary behavior.
• Release metadata: updated ace-task, ace-support-items, and root changelogs/versions to reflect the final delivered state.

📁 File Changes

 +125,    -9   12 files   total

  +27,    -2    4 files      ace-support-items/
   +6,    -2    2 files   🧱 lib/
   +5,    -1                 ace/support/items/atoms/stats_line_formatter.rb
   +1,    -1                 ace/support/items/version.rb
  +13,    -0    1 files   🧪 test/
  +13,    -0                 atoms/stats_line_formatter_test.rb
   +8,    -0    1 files      
   +8,    -0                 CHANGELOG.md

  +52,    -6    5 files      ace-task/
  +13,    -4    2 files   🧱 lib/
  +12,    -3                 ace/task/molecules/task_display_formatter.rb
   +1,    -1                 ace/task/version.rb
  +18,    -2    2 files   🧪 test/
   +1,    -0                 commands/list_test.rb
  +17,    -2                 molecules/task_display_formatter_test.rb
  +21,    -0    1 files      
  +21,    -0                 CHANGELOG.md

   +1,    -1    1 files      .ace-tasks/
   +1,    -1                 8qp.t.0vy-show-stats-footer-in-ace/8qp.t.0vy-show-stats-footer-in-ace-task-list.s.md

  +29,    -0    1 files      .ace-retros/
  +29,    -0                 8qp1ai-t-0vy-empty-task-list/8qp1ai-t-0vy-empty-task-list-stats-footer.retro.md

  +16,    -0    1 files      ./
  +16,    -0                 CHANGELOG.md

🧪 Test Evidence

• StatsLineFormatterTest (ace-support-items/test/atoms/stats_line_formatter_test.rb) — validates zero-status formatting fallback; 20 tests, 27 assertions, 0 failures, 0 errors.
• ListTest (ace-task/test/commands/list_test.rb) — verifies command-level empty-list output includes the footer; 8 tests, 32 assertions, 0 failures, 0 errors.
• TaskDisplayFormatterTest (ace-task/test/molecules/task_display_formatter_test.rb) — verifies empty-list footer plus 0 of N folder-summary behavior; 30 tests, 101 assertions, 0 failures, 0 errors.

📦 Releases

• ace-support-items v0.15.4 — fixed empty-status footer formatting and added regression coverage.
• ace-task v0.31.1–v0.31.3 — delivered footer-on-empty behavior, aligned formatter output, and added command/formatter regression assertions.
• project v0.9.926–v0.9.928 — recorded final shipped fixes and test hardening in the root changelog.

🎮 Demo

Run

ace-task list --filter id:__no_match__

Expected Output

No tasks found.

Tasks: • 0 of 313 — archive 301 | maybe 10 | next 2

Artifacts

No generated files; output is printed directly to stdout.