fix(code_indexer): honor ensure_ascii config instead of inverting it

[Osamaali313]

Problem

Three JSON-writing paths in tools/code_indexer.py invert the ensure_ascii config flag:

json_indent = output_config.get("json_indent", 2)
ensure_ascii = not output_config.get("ensure_ascii", False)   # <-- stray `not`
...
json.dump(index_data, f, indent=json_indent, ensure_ascii=ensure_ascii)

(at lines 1131 / 1325 / 1341 — build_all_indexes, generate_statistics_report, generate_summary_report).

This is clearly meant to be a pass-through:

• the sibling option one line above, json_indent, is read verbatim with no not;
• the config field is literally named ensure_ascii — the same keyword it feeds to json.dump;
• json.dump is used with ensure_ascii=False directly elsewhere in the file (line 445).

The shipped default is ensure_ascii: false (tools/indexer_config.yaml:100), i.e. keep literal UTF-8. But not False → True, so the code escapes every non-ASCII character (Chinese text, accented identifiers in LLM-generated file summaries/concepts) as \uXXXX in the index/statistics/summary JSON — the opposite of the configured behavior.

Reproduction

Config {"ensure_ascii": false}, data {"summary": "推荐 café"}:

	output
before (not inverts)	{"summary": "推荐 café"} ❌
after (pass-through)	{"summary": "推荐 café"} ✅

These functions are live: workflows/codebase_index_workflow.py invokes build_all_indexes(), generate_summary_report(), and generate_statistics_report().

Fix

Drop the not at all three sites:

ensure_ascii = output_config.get("ensure_ascii", False)

No test suite currently covers code_indexer.py. python -m py_compile tools/code_indexer.py passes.

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