feat(dev-fkeys): propagate prefix-arg to projectile through F4 / F6

I had four call sites passing literal nil to `projectile-compile-project' / `projectile-run-project' / `projectile-test-project'. The literal nil ignored whatever prefix arg the user gave. So `C-u F4 → Compile' or `C-u F6 → All tests' didn't actually force projectile's re-prompt — the prefix arg got swallowed at our wrapper layer.

Switched all four to `current-prefix-arg':
- `cj/--f4-dispatch' — `compile-only' and `run-only' actions.
- `cj/f4-compile-only' — the C-F4 fast path's compiled-project branch.
- `cj/f6-test-runner' — the "All tests" menu entry.

Use case: when projectile's cached cmd is wrong (typo, stale, or whatever), `C-u' on any of these forces projectile to re-prompt instead of replaying the bad cmd silently. The compile-and-run and clean-rebuild paths still pass nil to their chained projectile calls because those run inside an async `compilation-finish-functions' hook, where `current-prefix-arg' has already reverted to nil. Refining those would need to capture the prefix at entry and thread it through; left for later.

TDD: 4 new tests (one per call site) bind `current-prefix-arg' to t and verify projectile receives t. Each test failed against the literal-nil version and passes against `current-prefix-arg'.

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