fix(antigravity): map model IDs 1418/1419 to gemini-4-argon - #1905

Upstream tip: c76874e (2026-10-20, chore(pricing): update models.dev snapshot)
Previous fork base: 0c58b88 (the upstream commit this fork was synced to)

Synced 83 upstream commits on top of 0c58b88: 56 automated pricing
snapshot refreshes and the following meaningful ones:

  1cd29f5 chore(deps): update pnpm to v12.13.0 (ccusage#1907)
  e4f63ba chore(deps): update node.js to >=24.22.0 (ccusage#1908)
  130e502 ci: regenerate bun.nix automatically (ccusage#1909)
  259ec33 feat(adapter): report stored cost in JSON model breakdowns (ccusage#1903)
  c1eb448 chore: release v20.0.35 (ccusage#1901)
  2a0875f ci(pricing): update snapshots on push to main and daily instead of hourly (ccusage#1914)
  b090428 chore(deps): update github/codeql-action action to v4.39.0 (ccusage#1912)
  4dcf7f5 fix(nix): pin models-dev-gen remeda to models.dev's version and stop Renovate drift (ccusage#1915)
  46edb28 fix(nix): stop the dev shell from copying the whole repository (ccusage#1917)
  58ec8f1 fix(nix): let commits succeed in worktrees without a loaded dev shell (ccusage#1920)
  a570a6f fix(nix): vendor Cargo deps without import-from-derivation (ccusage#1918)
  f6d28c5 fix(antigravity): map model IDs 1418/1419 to gemini-4-argon (ccusage#1905)
  ce439e5 fix(antigravity): map model ID 1050 to gemini-3.1-flash-lite (ccusage#1902)
  e62a66f chore(deps): update pnpm to v12.14.0 (ccusage#1923)
  117ae68 ci(nix): make the macOS Nix cache save a trimmed store with the Crane layers (ccusage#1921)
  7a063a0 ci: shorten the Windows native build critical path (ccusage#1924)
  85ebca3 perf(rust): move pricing snapshots into a leaf crate (ccusage#1922)
  8fe3f47 perf(nix): build Crane layers with the binary's feature resolution (ccusage#1925)
  ac289aa perf(pricing): give the pricing refresh a verify-only TLS 1.3 rustls provider (ccusage#1927)
  d097f74 chore(deps): update rust crate rustls to 0.23.46 (ccusage#1928)
  f8aaf89 docs: use the compact pkg.pr.new URL for bunx previews [ci skip] (ccusage#1929)
  f56bb3d chore: release v20.0.36 (ccusage#1916)
  aaafb41 chore(deps): update dependency vitepress-plugin-group-icons to ^1.8.1 (ccusage#1931)
  0861e7f fix(claude): count requestless resp_ content blocks once (ccusage#1935)
  867c9f3 chore: release v20.0.37 (ccusage#1933)
  fa40bfd chore(deps): update songmu/tagpr action to v1.21.3 (ccusage#1937)
  de99d15 chore(deps): update rust crate zstd to 0.14.3 (ccusage#1936)

Fork wins kept: the SQLite on-disk cache with --live-only and the per-namespace
ledger, the pi adapter and its per-path namespaces, the OpenCode V2 loader, the
FxHash/Cow hot paths, the table renderer, clear-cache, and the tag-only release
workflow. Upstream's own release and tagpr machinery stays out.

Hand-resolved conflicts:

  rust/adapters/claude/src/lib.rs: upstream's resp_ message-id dedupe (ccusage#1935) lands
    beside the fork's requestless replay and collapse_replays rules.
  rust/adapters/claude/src/README.md: upstream's wording for the msg_/resp_ exception.
  rust/Cargo.toml: zstd 0.14.3, keeping the fork's exact `=` pin style.
  .github/workflows/release.yaml: the fork's tag-only release, without upstream's
    tagpr job or the songmu/tagpr action bump.
  apps/ccusage/package.json, docs/package.json, package.json: keep 20.0.34;
    upstream's 20.0.37 bump is dropped.
  packages/ccusage-*/package.json (6 files): stay deleted; the fork ships no npm
    wrapper packages and the release workflow does not read them.
  rust/adapters/claude/src/daily.rs: stays deleted; the fork's daily path lives in
    lib.rs and shares the dedupe helper the fix changes.

Fixes made while landing this sync, folded in so the merge stands green on its own:

  fix(ci): save the Nix store from the native build composites. The nested
    cache-nix-action read an empty primary-key at post-job and every native
    build failed; upstream's defer-save pattern is the fix.
  fix(rust): keep the agent-recorded cost for deleted sources. The recorded_cost
    ledger column carries it, so storedCost survives a deleted file. The ledger
    schema version stays at 2: the column is not a LedgerEntry field, so the blob
    layout is unchanged and the previously released binary keeps working.
  fix(rust): make the file fingerprint helper private, the one hawk finding. It is
    inherited from the pre-sync master, not introduced here.

Keep 20.0.34 numbering; DO NOT push a v20.0.34 tag from this fork (release.yaml
would publish fork bytes under upstream identity).