fix: make get_queue_info reader-callable

[NikolayS]

Bug

pgque.get_queue_info() and pgque.get_queue_info(text) are granted to pgque_reader and documented in docs/reference.md / docs/monitoring.md as reader-usable monitoring functions, but a pgque_reader session fails at runtime:

ERROR:  permission denied for function seq_getval
CONTEXT:  PL/pgSQL function pgque.get_queue_info(text) line 58 at assignment
PL/pgSQL function pgque.get_queue_info() line 26 at FOR over SELECT rows

Root cause

get_queue_info is inherited from upstream PgQ as SECURITY INVOKER. The 1-arg overload internally calls pgque.seq_getval(text) to compute ev_new, and that helper's ACL is admin-only ({postgres, pgque_admin}). A reader therefore cannot execute it. The sibling functions get_consumer_info and get_batch_info are SECURITY DEFINER for exactly this reason and work fine for readers — get_queue_info was the odd one out.

Fix

Promote both get_queue_info overloads to SECURITY DEFINER with SET search_path = pgque, pg_catalog (mandatory for all SECURITY DEFINER per CLAUDE.md), mirroring the existing get_consumer_info / get_batch_info pattern. This grants no privilege beyond reading queue metadata plus the queue event sequence — the same surface the function already exposes to its (intended) readers.

• Patch added to build/transform.sh (the source of truth for the generated installs), with a guard asserting exactly 2 overloads are promoted.
• Regenerated sql/pgque.sql and sql/pgque-tle.sql so generated and source stay consistent. Rebuild is reproducible (re-running transform.sh yields no diff).

Audited the other reader-granted observability functions for the same trap: only get_queue_info calls seq_getval under SECURITY INVOKER. get_batch_info / get_consumer_info are already DEFINER; status() is admin-only by design and left as-is.

Test (red/green TDD)

New regression tests/test_get_queue_info_reader.sql (registered in tests/run_all.sql) creates a queue, ticks it, then under set role pgque_reader calls both overloads and asserts success + populated ev_new.

• Against pre-fix SQL: fails with permission denied for function seq_getval (verified).
• Against the fix: passes. Full tests/run_all.sql suite passes on PostgreSQL 18.

Manual verification

select pgque.create_queue('bug_q');
set role pgque_reader;
select count(*) from pgque.get_queue_info();        -- was: permission denied; now: succeeds
select queue_name, ev_new from pgque.get_queue_info('bug_q');
reset role;

Fixes #265