fix(query): apply terminal-key conditionals per item

[QuantumExplorer]

Summary

• compute terminal keys by iterating queried items before applying conditional branches
• preserve first-matching conditional semantics and fall back to the default branch when no condition matches
• add terminal-key regressions plus an absence-proof verification case for unqueried conditional branches

Fixes #689.

Verification

• cargo test -p grovedb-query terminal_keys --test query_terminal_and_merge
• cargo test -p grovedb conditional_subquery_branches --lib
• cargo test -p grovedb verify_absence_ignores_unqueried_conditional_subquery_branches --lib
• git diff --check

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5f5fa02d-b27d-48cf-bc49-1d0ee7a07923

📥 Commits

Reviewing files that changed from the base of the PR and between a2129a9 and 503d3b8.

📒 Files selected for processing (5)

• grovedb-query/src/query.rs
• grovedb-query/tests/query_terminal_and_merge.rs
• grovedb-version/src/version/v3.rs
• grovedb/src/query/mod.rs
• grovedb/src/tests/proof_coverage_tests.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-689-terminal-keys-conditionals

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[codecov]

Codecov Report

❌ Patch coverage is 97.26027% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.42%. Comparing base (60f2968) to head (503d3b8).
⚠️ Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
grovedb-query/src/query.rs	97.67%	3 Missing ⚠️
grovedb/src/query/mod.rs	94.11%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #734      +/-   ##
===========================================
- Coverage    91.42%   91.42%   -0.01%     
===========================================
  Files          236      236              
  Lines        67053    67248     +195     
===========================================
+ Hits         61305    61481     +176     
- Misses        5748     5767      +19     

Components	Coverage Δ
grovedb-core	88.96% <94.11%> (+0.02%)	⬆️
merk	92.26% <ø> (ø)
storage	86.36% <ø> (ø)
commitment-tree	96.43% <ø> (ø)
mmr	96.79% <ø> (+0.03%)	⬆️
bulk-append-tree	89.39% <ø> (+0.13%)	⬆️
element	97.38% <ø> (+0.01%)	⬆️

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