BE-455: HashQL: Introduce evaluation orchestrator

[indietyp]

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Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

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• are internal and do not require a docs change

🕸️ Does this require a change to the Turbo Graph?

The changes in this PR:

• do not affect the execution graph

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[indietyp]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• BE-474: HashQL: Take into account terminator target eligibility in execution backend placement #8587
• BE-455: HashQL: Introduce evaluation orchestrator #8586 👈 (View in Graphite)
• BE-306: HashQL: PostgreSQL translation #8526
• BE-457: HashQL: MIR execution pipeline extensions for postgres compilation #8525
• BE-456: HashQL: Entity type model enrichment and graph store query extensions #8524
• BE-429: HashQL: Add island dependency graph with data requirement resolution #8501
• BE-428: HashQL: Simplify traversal tracking to path recording #8498
• BE-434: HashQL: Refactor entity storage path resolution with centralized schema mapping #8496
• BE-427: Add hashql-macros crate with procedural macros for ID types and symbols #8495
• main

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[codecov]

Codecov Report

❌ Patch coverage is 62.91310% with 303 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.45%. Comparing base (c015a34) to head (95af2dc).

Files with missing lines	Patch %	Lines
libs/@local/hashql/compiletest/src/pipeline.rs	0.00%	123 Missing ⚠️
libs/@local/hashql/core/src/heap/pool.rs	29.67%	64 Missing ⚠️
...src/store/postgres/query/expression/conditional.rs	0.00%	41 Missing ⚠️
...src/module/std_lib/graph/types/knowledge/entity.rs	87.07%	34 Missing ⚠️
...l/hashql/core/src/module/std_lib/graph/temporal.rs	77.85%	31 Missing ⚠️
...ore/src/module/std_lib/graph/types/ontology/mod.rs	85.71%	5 Missing ⚠️
...e/std_lib/graph/types/principal/actor_group/web.rs	81.25%	3 Missing ⚠️
...e/std_lib/graph/types/principal/actor_group/mod.rs	87.50%	2 Missing ⚠️

Additional details and impacted files

@@                            Coverage Diff                             @@
##           bm/be-306-hashql-postgres-translation    #8586       +/-   ##
==========================================================================
- Coverage                                  63.93%   53.45%   -10.49%     
==========================================================================
  Files                                       1195      976      -219     
  Lines                                     130685    94048    -36637     
  Branches                                    5005     4035      -970     
==========================================================================
- Hits                                       83555    50272    -33283     
+ Misses                                     46263    43239     -3024     
+ Partials                                     867      537      -330     

Flag	Coverage Δ
apps.hash-ai-worker-ts	1.40% <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	9.63% <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> (ø)
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	2.52% <ø> (ø)
rust.hash-graph-authorization	62.34% <ø> (ø)
rust.hash-graph-postgres-store	26.74% <0.00%> (-0.07%)	⬇️
rust.hash-graph-store	37.76% <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	?
rust.hashql-compiletest	28.34% <0.00%> (-1.36%)	⬇️
rust.hashql-core	82.17% <78.51%> (-0.27%)	⬇️
rust.hashql-diagnostics	72.53% <100.00%> (+0.09%)	⬆️
rust.hashql-eval	?
rust.hashql-hir	?
rust.hashql-mir	?
rust.hashql-syntax-jexpr	94.05% <ø> (ø)

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[codspeed-hq]

Merging this PR will degrade performance by 17.99%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

❌ 1 regressed benchmark
✅ 79 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	unique[100]	20.2 µs	24.6 µs	-17.99%

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_{Comparing bm/be-455-hashql-create-evaluation-target-coordinator (95af2dc) with bm/be-306-hashql-postgres-translation (c015a34)}