Run stubCall/expectCalled/expectNotCalled rewrites in setUp/tearDown/beforeEach/afterEach hooks

[chrisdp]

Summary

• m.stubCall(...), m.expectCalled(...), and m.expectNotCalled(...) are compile-time AST rewrites performed by the bsc-plugin. Until now the plugin only walked the bodies of @it-decorated methods, so the same calls inside @setup / @tearDown / @beforeEach / @afterEach hooks were left untouched and the underlying call executed unmodified at runtime.
• This PR walks each group's hook methods once per build (de-duped by lowercased function name) so the assertion-rewrite and global-stub-gathering passes run there too.
• Hooks already run on the same m.testSuite instance the tests use, and per-test cleanMocks/cleanStubs already happens after each test — so stubs and expectations set up in beforeEach persist into the test and are cleaned correctly afterwards.

Code changes

• src/lib/rooibos/TestGroup.ts — extracted the per-function walk into modifyAssertionsInFunction; added modifyAssertionsForHook(hookFuncName, ...) that reuses it.
• src/lib/rooibos/MockUtil.ts — gatherGlobalMethodMocks now walks each group's hook methods too, so free functions referenced only from a hook get registered in efficient global-stub mode.
• src/plugin.ts — beforeFileTranspile walks each group's four hook methods once per build (separate modifiedHookFunctions Set keyed on suite + path + lowercased funcName) before processing test cases.

Tests

• 6 new tests under transpilation in setup hooks in src/plugin.spec.ts covering: stubCall in @beforeEach, expectCalled with the early-exit guard, expectNotCalled in @afterEach, stubCall in both @setup and @tearDown, global-stub registration from @beforeEach (efficient mode), and the no-double-walk de-dup across groups that share a method name.
• New sample test-project/src/source/HookStubs.spec.bs (no existing samples changed) demonstrating each form for documentation/regression purposes.