refactor(clippy): collapse nested if blocks across multiple files

[github-actions]

What clippy found

clippy::collapsible_if fired 8 times across 6 files:

error: this `if` statement can be collapsed
   --> src/compile/filter_ir.rs:635:5
error: this `if` statement can be collapsed
  --> src/compile/pr_filters.rs:33:5
error: this `if` statement can be collapsed
  --> src/compile/pr_filters.rs:51:5
error: this `if` statement can be collapsed
   --> src/logging.rs:101:13
error: this `if` statement can be collapsed
    --> src/mcp.rs:1528:17
error: this `if` statement can be collapsed
   --> src/runtimes/dotnet/extension.rs:113:9
error: this `if` statement can be collapsed
   --> src/runtimes/dotnet/extension.rs:123:9
error: this `if` statement can be collapsed
  --> src/update_check.rs:29:13

How it was fixed

Lint: clippy::collapsible_if
Fix: Collapse if outer { if inner { ... } } into a single if outer && inner { ... } (using && let-chain syntax where needed).

Files touched:

• src/compile/filter_ir.rs
• src/compile/pr_filters.rs
• src/logging.rs
• src/mcp.rs
• src/runtimes/dotnet/extension.rs
• src/update_check.rs

Verification

• cargo build --all-targets ✅
• cargo test ✅ (all tests pass)
• cargo clippy --all-targets --all-features --workspace -- -D warnings — all 8 collapsible_if errors resolved ✅

Warning

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