fix: web profiler export records resolved params, not sparse currentOpts

[propcgamer20-png]

Problem

assets/profiler-ui.js and assets/profiler-compare.js both build the export's provenance as:

params: Object.assign({}, currentOpts),

currentOpts starts as {} on every upload and only gains a key when the user manually edits a threshold input. So for any plain run where no threshold is touched (the common case), provenance.params is exported as {} - not the 7 resolved defaults that SPEC.md section 10 requires ("the knobs of section 7 as resolved, defaults included") and that the Python CLI/MCP path already records via provenance.public_params.

python: {'cross': None, 'imbalance_flag': 3.0, 'intersection_floor': 0.01,
         'min_group_size': 100, 'min_share': 0.05, 'missing_flag': 0.05,
         'reference_flag': 0.05}
js:     {}

An export that omits every default threshold can't answer "was this produced from these thresholds" after the fact.

Fix

New E.publicParams(opts) in profiler-engine.js, mirroring faircode.provenance.public_params(faircode.profiler._resolve_opts(opts)):

function publicParams(opts) {
  var resolved = resolveOpts(opts);          // merge over DEFAULT_OPTS
  var out = {};
  Object.keys(resolved).sort().forEach(function (k) {
    if (!OPAQUE_PARAMS[k]) out[k] = resolved[k];   // drop the parsed `reference` object
  });
  return out;
}

Exported from the engine, and used at both params: sites. A user-set threshold still shows through (publicParams({min_share: 0.2}) -> min_share: 0.2, rest defaulted).

Test

test_python_js_public_params_parity_for_a_defaulted_run - asserts E.publicParams({}) (run under Node) equals public_params(_resolve_opts(None)) and carries exactly the 7 expected keys, reference not among them.

pytest tests/test_js_parity.py -> 22 passed, 1 failed (test_python_js_profiler_parity_sniffs_quoted_newlines, pre-existing on main on this platform, unrelated).

Closes #490

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[github-actions]

@yakew7 @ahmdkaml - new PR touching a path you own, please review.

[yakew7]

@propcgamer20-png fix the conflicts