fix(cache): revalidate staged sources before deploy

[zackees]

Fixes #1075

The daemon watch-set fingerprint cache no longer reuses a two-second-old source hash by default. This prevents AutoResearch staging from deploying a cached firmware artifact that predates the staged C++ source.

Validation:

• soldr cargo clippy -p fbuild-daemon --all-targets -- -D warnings
• soldr cargo test -p fbuild-daemon --lib (197 passed, 1 ignored)
• Regression test: default cache rejects an immediate post-staging lookup

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📥 Commits

Reviewing files that changed from the base of the PR and between 83a5018 and 8018b4e.

📒 Files selected for processing (2)

• crates/fbuild-daemon/src/context.rs
• crates/fbuild-daemon/src/watch_set_cache.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/1075-stage-cache-invalidation

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