fix: reject repeated done callbacks in TAP harness

[pmatos]

Summary:

• reject synchronous and post-settlement repeated done() calls in callback-style TAP tests and hooks
• buffer TAP rows so late duplicates update the original result without duplicate TAP IDs
• drain user one-shot timers and wait for at most the next tick of each user interval before freezing TAP output
• require one quiet macrotask turn so promise continuations can enqueue follow-up timers
• give each suite hook an idempotent failure recorder shared by its rejection and late-duplicate paths
• cover synchronous, promise/timer, interval, and suite-hook repeated completion regressions

Validation:

• node --check scripts/node-test-harness.js
• ./scripts/run-harness-selftest.sh --no-build
• forced-Node interval and suite-hook fixtures
• cargo fmt --check
• cargo clippy
• ./scripts/lint.sh
• cargo build --release
• cargo test --release (294 unit tests plus smoke oracle)
• uv run python scripts/run-custom-tests.py (7/7)
• ./scripts/run-library-tests.sh js-sha256 (916/916 on jsse and Node)
• full test262: 99,546/99,568; same 22 environment-sensitive Intl baseline mismatches and 323 existing new passes. This branch has no engine/Cargo diff, so README and the baseline remain unchanged.

Closes #272

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[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

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🎉 This PR is included in version 0.2.0 🎉

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