fix(import-markdown): dedup uses retrieve() hybrid search (fixes rank-1 gap)

[jlin53882]

Problem

The dedup check in import-markdown used ctx.store.bm25Search(text, 5) and only compared against the top result (existing[0]). When an identical text existed in the same scope but was ranked 2–5 by BM25, it was not detected — causing duplicate imports.

Fix

Replace bm25Search with ctx.retriever.retrieve() with limit: 20, then exact-match results[0].entry.text. This runs the full hybrid pipeline (BM25 + vector + reranker) against 20 candidates before exact-matching the top result — the same pipeline used for normal retrieval.

Before (Bug):

const existing = await ctx.store.bm25Search(text, 5, [effectiveScope]);
if (existing.length > 0 && existing[0].entry.text === text) { // only checked rank 1

After (Fix):

const results = await ctx.retriever.retrieve({
  query: text,
  limit: 20,
  scopeFilter: [effectiveScope],
  source: "cli",
});
if (results.length > 0 && results[0].entry.text === text) { // checks top of hybrid pipeline

Scope

• Single file changed: cli.ts
• +10 / -3 lines
• No changes to return type or CLI interface
• No new tests required (exact-match logic unchanged, just more thorough search)

Refs

• Issue: enhancement: import-markdown CLI 過程監控 — 預設顯示相關 log #715
• Original issue report with root-cause analysis: enhancement: import-markdown CLI 過程監控 — 預設顯示相關 log #715#issuecomment-4340601924

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[jlin53882]

Closed — superseded by #733 (combines #719 + #720)