[schmitch]

Fixes #604

What changed

package_delay_hides_then_reveals (crates/core/tests/proxy_read.rs) gave its proxy a 1-second package delay and expected both the listing and the direct download to fall inside it. On CI's test job, which runs test binaries side by side, that second could pass between the two calls (run 40574617151: direct download must 404 inside the delay window).

The test now:

• gives the proxy a one-hour delay, so no runner is slow enough to leave the window between the two in-window calls;
• ends the window by backdating the version's first_seen_at two hours instead of sleeping 1.1 s past it.

This is the deterministic form of the slack the issue asks for. The e2e test of the same name (crates/e2e/tests/proxy.rs) already works this way for the same reason, and the file's other delay tests backdate first_seen_at too. The test no longer reads the wall clock and no longer sleeps. The rest is unchanged: it still reuses the same ProxyRepo after the window, so the download that succeeds afterwards still shows the in-window 404 was not negatively cached in memory or in the database.

There is no changelog fragment because the change touches a test only and nobody running Forge would notice it (as with #486).

Checks

• cargo test -p forge-core --test proxy_read: all 56 pass
• cargo clippy -p forge-core --all-targets -- -D warnings: clean
• cargo fmt --all -- --check: clean

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