Update Rust toolchains to nightly-2025-12-15

[hash-worker]

This PR contains the following updates:

Package	Update	Change
rust	patch	2025-12-01 -> 2025-12-15

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[codecov]

Codecov Report

❌ Patch coverage is 82.60000% with 87 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.79%. Comparing base (93c0279) to head (b3faf84).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
libs/@local/hashql/core/src/heap/clone.rs	18.60%	35 Missing ⚠️
libs/@local/hashql/core/src/heap/transfer.rs	72.46%	19 Missing ⚠️
libs/@local/hashql/core/src/heap/allocator.rs	82.08%	12 Missing ⚠️
libs/@local/hashql/core/src/heap/mod.rs	80.00%	10 Missing ⚠️
libs/@local/hashql/core/src/heap/scratch.rs	64.28%	10 Missing ⚠️
...ashql/syntax-jexpr/src/parser/string/combinator.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8172      +/-   ##
==========================================
+ Coverage   58.44%   58.79%   +0.35%     
==========================================
  Files        1181     1188       +7     
  Lines      111529   112204     +675     
  Branches     5012     5010       -2     
==========================================
+ Hits        65180    65975     +795     
+ Misses      45592    45471     -121     
- Partials      757      758       +1     

Flag	Coverage Δ
apps.hash-ai-worker-ts	1.32% <ø> (ø)
apps.hash-api	0.00% <ø> (ø)
blockprotocol.type-system	40.84% <ø> (ø)
local.claude-hooks	0.00% <ø> (ø)
local.harpc-client	51.24% <ø> (ø)
local.hash-graph-sdk	10.88% <ø> (ø)
local.hash-isomorphic-utils	0.00% <ø> (ø)
rust.antsi	0.00% <ø> (ø)
rust.error-stack	90.88% <ø> (ø)
rust.harpc-codec	84.70% <ø> (ø)
rust.harpc-net	96.16% <ø> (-0.05%)	⬇️
rust.harpc-tower	66.80% <ø> (ø)
rust.harpc-types	0.00% <ø> (ø)
rust.harpc-wire-protocol	92.23% <ø> (ø)
rust.hash-codec	72.76% <ø> (ø)
rust.hash-graph-api	2.89% <ø> (ø)
rust.hash-graph-authorization	62.47% <ø> (ø)
rust.hash-graph-postgres-store	25.61% <ø> (ø)
rust.hash-graph-store	30.54% <ø> (ø)
rust.hash-graph-temporal-versioning	47.95% <ø> (ø)
rust.hash-graph-types	0.00% <ø> (ø)
rust.hash-graph-validation	83.45% <ø> (ø)
rust.hashql-ast	87.25% <100.00%> (+<0.01%)	⬆️
rust.hashql-compiletest	46.65% <ø> (ø)
rust.hashql-core	82.34% <78.60%> (+0.13%)	⬆️
rust.hashql-diagnostics	72.43% <ø> (ø)
rust.hashql-eval	68.54% <ø> (ø)
rust.hashql-hir	89.10% <100.00%> (ø)
rust.hashql-mir	88.77% <ø> (+2.01%)	⬆️
rust.hashql-syntax-jexpr	94.05% <98.43%> (+<0.01%)	⬆️

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[cursor]

PR Summary

Bumps Rust toolchain to nightly-2025-12-15, updates badges/docs, adjusts feature gates in HashQL crates, and removes a clippy expect in test sampling code.

• Toolchain:
  • Update rust-toolchain.toml channel to nightly-2025-12-15.
• Docs/Badges:
  • Update Rust version badge to 1.83.0/nightly-2025-12-15 in libs/error-stack/README.md, libs/error-stack/macros/README.md, and libs/error-stack/src/lib.rs.
• HashQL crates:
  • Adjust #![feature(...)] gates in libs/@local/hashql/core/src/lib.rs and libs/@local/hashql/mir/src/lib.rs (e.g., drop array_windows, remove exact_length_collection, keep step_trait).
• Tests:
  • Remove #[expect(clippy::tuple_array_conversions, ...)] around WeightedIndex::new([..]) in tests/graph/.../domain.rs.

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