rba-mcp 0.1.9 — describe_table freshness + yield-curve search routing

0.1.9 (2026-05-13)

Loop-audit value pass — three low-effort, high-value polish wins surfaced
by a focused review of the customer-facing surface.

• New: SeriesDetail.end_date — describe_table now reports the
  latest non-null observation per series alongside start_date. An
  LLM can answer "is this data fresh?" from a single describe_table
  call without a follow-up latest(). Populated via
  df[col].last_valid_index() in both curated and non-curated branches.
• Search: F2 / F2.1 keywords expanded. Added yield curve,
  bond yields, australian government securities, ags, and short
  bond tenors (2 year bond, 3 year bond, 5 year bond) to the
  f2-data and f2.1-data entries in tables.yaml. A user asking
  "what's the Australian yield curve?" now lands on F2 / F2.1
  immediately. Verified via two new search routing tests.
• Search ranker: phrase-match bonus (+20). Added alongside the
  existing curated +30 bonus. If the full query phrase appears as a
  substring in a table's haystack, that table gets +20. Lets strong
  non-curated matches (like "yield curve" → F2) compete with the
  curated boost when a query is highly specific to a non-curated
  table; curated tables that ALSO phrase-match still stack both
  bonuses, so common queries route correctly.
• Tests: +4 regressions — end_date populated for curated +
  non-curated, "yield curve" → F2 routing, "bond yields" → F2
  routing. 111 unit tests now (was 107).