fix: capture transactional factsheet anchors

[ousamabenyounes]

Summary

• Extend factsheet extraction for issue 55 exact-token classes: email addresses, IBAN-like strings, and currency amounts such as $14,360.
• Keep those tokens in the protected priority tier alongside existing UUID, hex, flag, and number anchors.
• Add a focused factsheet regression test for transactional text.

Fix #55

Test verification (RED -> GREEN)

RED, new test before production extractor change:

> pxpipe-proxy@0.8.0 test
> vitest run tests/factsheet.test.ts

RUN  v4.1.6

❯ tests/factsheet.test.ts (15 tests | 1 failed) 65ms
    × captures issue 55 exact-token classes for transactional text 8ms

Test Files  1 failed (1)
Tests  1 failed | 14 passed (15)

RED, production factsheet changes temporarily reverted while keeping the test:

> pxpipe-proxy@0.8.0 test
> vitest run tests/factsheet.test.ts

RUN  v4.1.6

❯ tests/factsheet.test.ts (15 tests | 1 failed) 51ms
    × captures issue 55 exact-token classes for transactional text 5ms

Test Files  1 failed (1)
Tests  1 failed | 14 passed (15)

GREEN, focused test after fix:

> pxpipe-proxy@0.8.0 test
> vitest run tests/factsheet.test.ts

✓ tests/factsheet.test.ts (15 tests) 81ms

Test Files  1 passed (1)
Tests  15 passed (15)

GREEN, required checks:

> pxpipe-proxy@0.8.0 typecheck
> tsc --noEmit

> pxpipe-proxy@0.8.0 test
> vitest run

Test Files  32 passed (32)
Tests  646 passed (646)

> pxpipe-proxy@0.8.0 build
> node scripts/build.mjs

✓ emitted dist/ library modules + declarations
✓ built dist/node.js
✓ version smoke check: --version prints 0.8.0