extract_numbers.py: 'FY2023 to' parses as 2,023,000,000,000,000 — a lone letter is accepted as a magnitude suffix

[AB2006-personal]

Summary

skills/ib-check-deck/scripts/extract_numbers.py reads a four-digit year plus
the first letter of the following word as a magnitude-suffixed number.

The sentence "Revenue grew from $100.0 million in FY2023 to $120.0 million in
FY2024." yields a third figure: 2023t → 2,023,000,000,000,000, i.e. two
quadrillion dollars, categorised as revenue.

The t comes from the word "to".

Cause

# lines 118–125
r'(?P<number>[\d,]+(?:\.\d+)?)'
r'\s*'
r'(?P<unit>%|bps|x|'
r'[Tt]rillion|[Bb]illion|[Mm]illion|[Tt]housand|'
r'[TBMKtbmk]n?|mm|MM)?'   # a LONE letter counts as a magnitude
r'(?!\d)'                  # stops a following DIGIT, but not a following LETTER

\s* lets the unit sit across the space, [TBMKtbmk] accepts the bare t, and
(?!\d) only rules out a following digit — so ... 2023 to ... matches with
number=2023, unit=t.

Reproduce

from extract_numbers import extract_numbers
for n in extract_numbers("Revenue grew from $100.0 million in FY2023 to $120.0 million in FY2024."):
    print(n.value, n.unit, n.normalized, n.category)

$100.0million  USD_million             100000000  revenue
2023t          t          2023000000000000000     revenue   <-- 2.023e15
$120.0million  USD_million             120000000  revenue

Any "from FY20XX to FY20YY" sentence — routine in a deck — injects one. The
figure then dominates find_inconsistencies, since it is compared against real
revenue in the same category.

Suggested fix

Two changes, either of which kills this case; both together are safer:

1. Require a non-letter after the unit, not just a non-digit:

   r'(?![A-Za-z0-9])'

2. Reject a bare four-digit year carrying neither a currency symbol nor a
   unit — 1900–2099 with no $/€/£ and no suffix is a date:

   if re.fullmatch(r'(?:19|20)\d{2}', raw) and not currency and not unit:
       continue

Keep the genuine suffixes working: $1.2bn, $300m, 45k must still parse.

Scope

Two copies on main:

• plugins/vertical-plugins/financial-analysis/skills/ib-check-deck/scripts/extract_numbers.py
• plugins/agent-plugins/pitch-agent/skills/ib-check-deck/scripts/extract_numbers.py

Related but separate defect filed alongside this one (period-blind grouping).
Happy to open a PR.