refactor(exec): own path hydration and query resources

[DecisionNerd]

Path-node hydration previously performed storage reads inside graphforge-rel, outside execution-owned memory and cancellation controls. Move hydration into exec with retained authenticated providers, the query's memory pool, fallible reservations, and whole-query cancellation. Recursive expression binding preserves nested quantifier/list-comprehension evaluation and propagates resource errors.

Shared Arrow schemas now live in IR with storage compatibility reexports. Rel has no production storage dependency in Cargo or Bazel, and the unused StorageProvider stubs are removed. This completes the remaining boundary work after #1148.

Validation:

• Facade unit tests: 703 passed; API BDD: 118 passed; full TCK: 3,897 passed, zero regressions.
• Hydration: 11 passed, including actual pool refusal/release, nested error propagation, selected recovery-health refusal, sibling partitions, public write prefix/suffix owner drop, and retained rows across sixteen stems.
• Read/write integration: 8 + 21 passed; relational units/goldens: 232 + 15 passed.
• Workspace Clippy, fast gate, gate registry, formatting and Cargo/Bazel drift passed.
• Final rebase onto merged parser work: locked rel/exec/API check and hydration 11 + read 8 + write 21 rerun passed; full workspace and benchmark locked metadata passed. The benchmark lock change removes only rel’s former production storage edge.

The write cancellation regression proves owner drop before paused collection resumes; it does not claim interruption of an actively running synchronous callback. Output lifetime/RSS metering and new backend support are not introduced. The independently reproduced main-branch fixed-hop SET/path-return defect is tracked in #1153.

Closes #1006

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