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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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hermes 2026-10-18 05:39:05 +00:00
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2
web/src/content/docs/cli/reference.md
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@ -355,7 +355,7 @@ Examples:
### `idx stocks bandar`
```text
Bandarmology from the broker summary: the top 1, 3, 5 and 10 buyers' value against the same number of sellers', as a share of value traded, with a signal from big accumulation to big distribution. Several symbols give a screen ranked by the headline tier (at most 100, one request each). A heuristic over end-of-day broker codes, not advice.
Bandarmology from the broker summary: the top 1, 3, 5 and 10 buyers' value against the same number of sellers', as a share of value traded, with a signal from big accumulation to big distribution. Several symbols give a screen ranked by the headline tier (at most 100, one request each). Counts all investors (`--investor` must be `all`). A heuristic over end-of-day broker codes, not advice.
Usage: idx stocks bandar [OPTIONS] <SYMBOLS>...

3
web/src/content/docs/cli/stocks.md
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@ -68,7 +68,8 @@ traded. The headline tier (`--top`, default 5) gives the signal:
| -15% or less | big distribution |
Several symbols give a screen ranked by that figure (at most 100, one request
each), and it takes the same date and filter flags as `broker`. It is a
each), and it takes the same date and board flags as `broker` (all investors
only: the summary has no total for one side). It is a
heuristic: a broker trades for many clients, and a broker on both sides of
the summary is listed, since its gross figures overstate which way it traded.
The JSON names the rules in `method` (`top_concentration_v1`).