AssetClass cleanup: rename treasury_note → treasury + add adr/cash/etn/forward/swap/warrant (0.5.0)

[mwlang]

Summary

• Renames :treasury_note → :treasury in Quant::AssetClass::CLASSES (the single symbol now covers the full US-government-debt family — bills, notes, bonds, TIPS; maturity becomes listing metadata, not an AssetClass distinction).
• Adds six new entries: :adr, :cash, :etn, :forward, :swap, :warrant.
• Final 19-entry catalog (alphabetical): adr, bond, cash, commodity, cryptocurrency, etf, etn, forex, forward, future, mbs, mutual_fund, option, preferred_stock, reit, stock, swap, treasury, warrant.
• Version bump 0.4.1 → 0.5.0 (pre-1.0 SemVer minor signals breaking).

Why this is breaking

Removing :treasury_note from CLASSES is breaking for consumers that exhaustively switch on the set or pattern-match on the retired symbol.

Migration: s/:treasury_note/:treasury/g across consumer code. Where maturity-aware behavior is needed (e.g., yield-curve segmentation), consult the listing metadata rather than the AssetClass label.

Commits

SHA	Subject
700e23d	T4b: AssetClass::CLASSES cleanup
97aed22	T4b: AssetClass specs for cleanup
4d9af33	T4b: version bump to 0.5.0
2490498	T4b: CHANGELOG — 0.5.0 entry + baseline capture
b0c9e1b	T4b: regenerate Gemfile.lock for quantitative 0.5.0
64e17f4	ci: bump codecov-action v4.0.1 → v5 + continue-on-error

Spec coverage

spec/lib/quant/asset_class_spec.rb gains:

• 19-count invariant assertion.
• Per-class acceptance: each of the 19 catalog entries initializes without raising and round-trips through #asset_class.
• Regression guard: :treasury_note (removed) now raises Quant::Errors::AssetClassError — protects against re-introducing the retired symbol.

Test plan

• Local suite: 1401 examples / 0 failures / 2 pending on this branch tip.
• After merge: tag v0.5.0 is already pushed; run gem build quantitative.gemspec && gem push quantitative-0.5.0.gem to publish to RubyGems.
• After publish: downstream consumers (virtuoso pinned to quantitative 0.5.0 on its main) resolve cleanly via bundle install.

Notes

• CHANGELOG.md is added in this PR; the file existed locally untracked from a prior session (the 0.4.1 entry documented the float-volume regression fix). The baseline [0.4.1] + [0.4.0] sections are captured alongside the new [0.5.0] entry in commit 2490498 so the file lands with full lineage.
• Tag v0.5.0 was created locally and pushed to origin before this PR was opened, so the GitHub release page already shows the tag.
• b0c9e1b regenerates Gemfile.lock's PATH section to quantitative (0.5.0) so CI's bundle install --frozen doesn't reject the gemspec/lockfile mismatch.
• 64e17f4 is unrelated to AssetClass cleanup but landed here because codecov/codecov-action@v4.0.1 had a Codecov-side bootstrap regression (CLI fetch returning HTML instead of JSON, then EPIPE during gpg signing) that was blocking the PR. v5 ships a different bootstrap path; added continue-on-error: true so future Codecov outages stay best-effort rather than build-gating. Last green CI on main was 2026-05-17; the regression landed in the intervening 5 days. Could be cherry-picked into its own grooming PR post-merge if a cleaner audit trail is wanted.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.15%. Comparing base (98173af) to head (64e17f4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #10   +/-   ##
=======================================
  Coverage   99.15%   99.15%           
=======================================
  Files          75       75           
  Lines        2243     2243           
=======================================
  Hits         2224     2224           
  Misses         19       19           

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