fix: preserve launcher PATH for daemon tools

[zackees]

Replaces the sudo /usr/local/bin workaround from #1178.\n\nThe detached daemon keeps its clean user environment but now preserves only the launching CLI PATH, which is required to discover explicitly installed build tools. This is cross-platform and recognizes Windows' case-insensitive Path spelling. All other parent-process variables remain excluded.\n\nValidation: workflow render check and git diff --check passed. The focused binary test was attempted twice but timed out during the cold fbuild dependency compilation without a compiler or test failure.

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📒 Files selected for processing (3)

• .github/workflows/template_build.yml
• crates/fbuild-cli/src/daemon_client.rs
• crates/fbuild-cli/src/daemon_client/tests.rs

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