chore: enable manual_is_variant_and and manual_let_else clippy lints

[MingweiSamuel]

No description provided.

[MingweiSamuel]

hmm idk if this was supposed to be removed actually

[shadaj]

I keep getting warnings recently about the expect not being hit when no features are enabled...

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Pull request overview

Enables additional Clippy lints (manual_is_variant_and, manual_let_else) at the workspace level and updates several call sites to align with the new lint expectations.

Changes:

• Turn on manual_is_variant_and and manual_let_else in workspace Clippy lint configuration.
• Refactor several match / if let patterns into let ... else forms.
• Remove a conditional expect(unreachable_code) attribute from the embedded runtime helper.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Cargo.toml	Enables the two new Clippy lints as warn at the workspace level.
hydro_lang/src/viz/json.rs	Refactors object extraction to let ... else (currently introduces a move/return issue).
hydro_lang/src/location/cluster.rs	Refactors if let into let ... else when extracting Cluster IDs.
hydro_lang/src/deploy/deploy_runtime_containerized.rs	Refactors frame reads to let Some(Ok(...)) = ... else { ... } for handshake steps.
hydro_lang/src/deploy/deploy_graph_containerized_ecs.rs	Refactors LocationId extraction in loops to let ... else unreachable!().
hydro_lang/src/compile/embedded_runtime.rs	Removes a conditional expect(unreachable_code) attribute block.

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