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fix(core): symmetric bandar thresholds; bandar needs all investors

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- Basis points truncate toward zero instead of flooring, so a reading of
  -4.9952% stays neutral like its mirror image and -14.9952% stays
  distribution; tests cover both signs at both thresholds through
  bandar_tier. Goldens move by the rounding (BBCA top 5: -2426 -> -2425).
- With one investor side selected the summary has no total to weigh
  brokers against, so bandar and analyze_bandar reject it (INVALIDINPUT)
  instead of reading every tier as missing.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V3syn2fN2LNo5pvTSqc6eh
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crates/idx-cli/tests/golden/stocks-bandar-screen.json.golden
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crates/idx-cli/tests/golden/stocks-bandar-screen.jsonl.golden
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crates/idx-cli/tests/golden/stocks-bandar.json.golden
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--- stderr

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crates/idx-cli/tests/golden/stocks-bandar.table.golden
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--- stdout
Bandar reading for BBCA.JK, 2026-10-16
Signal (top 5): big distribution, -24.3% of value
Signal (top 5): big distribution, -24.2% of value
┌─────┬────────┬──────┬───────┬────────┬─────────┬──────────┬──────────────────┐
│ TOP ┆ BUY ┆ SELL ┆ NET ┆ NET % ┆ BUY AVG ┆ SELL AVG ┆ SIGNAL │
╞═════╪════════╪══════╪═══════╪════════╪═════════╪══════════╪══════════════════╡
@ -9,11 +9,11 @@ Signal (top 5): big distribution, -24.3% of value
├╌╌╌╌╌┼╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┤
│ 3 ┆ 2.0T ┆ 3.9T ┆ -1.9T ┆ -29.1% ┆ 5,212 ┆ 5,233 ┆ big distribution │
├╌╌╌╌╌┼╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┤
│ 5 ┆ 2.9T ┆ 4.5T ┆ -1.6T ┆ -24.3% ┆ 5,211 ┆ 5,229 ┆ big distribution │
│ 5 ┆ 2.9T ┆ 4.5T ┆ -1.6T ┆ -24.2% ┆ 5,211 ┆ 5,229 ┆ big distribution │
├╌╌╌╌╌┼╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┤
│ 10 ┆ 4.5T ┆ 5.6T ┆ -1.1T ┆ -16.3% ┆ 5,213 ┆ 5,228 ┆ big distribution │
└─────┴────────┴──────┴───────┴────────┴─────────┴──────────┴──────────────────┘
Total 6.6T IDR, average 5,228; foreign net -2.3T (-34.9% of value).
Total 6.6T IDR, average 5,228; foreign net -2.3T (-34.8% of value).
On both sides: AK, CC, MG, XL, YU, ZP; their gross figures overstate which way they traded.
Method top_concentration_v1: the top 5 buyers' value minus the top 5 sellers' value, as a share of value traded; 5% or more reads accumulation, 15% or more big (negative: distribution). Brokers trade for many clients, so this is a heuristic, not advice.
Note: the source rounds figures of a million and more to one decimal.