fix(cli): state how complete every list output is

[ysyneu]

What

Every list output now states how complete it is, using one shared rule (listPage.statement in internal/cli/command.go), so a partial page is not mistaken for the whole set.

Rules, applied in order from what the API returned:

1. total known: showing N of T, plus a next-page hint while rows remain
2. else has_next_page / next cursor known: true warns, false is complete
3. else a full page (N == limit): more may exist
4. else only the plain count

A count is never printed as a total. Previously the generic renderer and several curated commands printed Total: <row count> when the response had no total.

Table mode prints the statement as a stdout footer. json/toon/jsonl print a note: line on stderr only when rows may be missing; stdout is byte-identical.

Examples (stub server):

$ fduty monit rule-list-basic --folder-id 7 --include-descendants --limit 2 --output-format json
stderr: note: showing 2 results (= limit 2); more may exist; raise --limit

$ fduty member list --output-format json      # total 45, 2 rows
stderr: note: showing 2 of 45 total results (page 1); raise --limit or use --page 2

$ fduty member list                           # table
Showing 2 results (page 1, total 45).

Changes

• generated commands: printGenericResult takes the request body (cligen emits it, zz_generated_* regenerated) to learn the page and limit the request carried
• alert events: adds --page / --limit (the SDK request supports them) and shows the real total
• incident feed, alert timeline: surface has_next_page
• incident alerts: adds --page; the total shows in every mode
• incident similar, insight top-alerts: a full top-N list notes that more may exist
• session list: notes when the fetch was capped by --limit
• PrintTotal removed; callers use PrintList / PrintPage
• skill cards regenerated for the new flags

Tests

New list_completeness_test.go: the four rules, a generated bare-array full page (stderr note, stdout unchanged), generic envelopes with has_next_page / next cursor in table mode, alert events, feed commands, incident similar. A few existing assertions on the old Total: N footer were updated.

make test, make build, make lint (0 issues) and make check-cards pass.