feat: shareholder movements from the Stockbit session (ownership movements)

`idx ownership movements [SYMBOL]` and the MCP tool
`get_shareholder_movements` list reported changes in insiders' and major
holders' stakes, newest first, from Stockbit's
/insider/company/majorholder: IDX insider disclosures (any size, with the
trade price) and KSEI changes of holders at 5% and above (Stockbit's
estimated price). Stockbit filters by date range, holder id, action and
source; each page is 50 rows and one request, up to 10 pages, cached an
hour per page under every filter.

Rows keep exact signed share counts and the stake in basis points as
Stockbit rounds it; unknown action labels are kept as `other` rather than
dropped. JSON is {movements, more}; JSONL is one movement per line. The
command lives under `ownership` but needs no import, and `ownership`
commands now take --offline / --no-cache for it.

The per-symbol summary score is the next PR; docs/STOCKBIT.md records the
endpoint's parameters and action types as checked on 2026-11-03.

Claude-Session: https://claude.ai/code/session_01RqPPVeVDrnLoP7NUZmLRxY

docs/ARCHITECTURE.md

@@ -296,6 +296,13 @@ WIB as the fallback.
   `get_corporate_calendar` filter by `CorporateAction::date` (the cum date
   for entitlements) and sort oldest first. Endpoint notes and the wider
   design: `docs/STOCKBIT.md`.
+- Shareholder movements (`movements`, `api/stockbit/movement.rs`) read
+  `/insider/company/majorholder`: IDX insider disclosures and KSEI 5% holder
+  changes, 50 rows a page, filtered by Stockbit (`symbol`, `date_start`,
+  `date_end`, `insider` (holder id), `action_type`, `source_type`). Each page
+  is cached an hour under `stockbit-movements`, keyed by every filter and the
+  page. `ownership movements` and `get_shareholder_movements` read up to 10
+  pages; the KSEI register in SQLite is not involved.
 
 ### Capability Gating
 ```
@@ -310,6 +317,7 @@ Factory functions:
   intraday_provider() → Box<dyn IntradayProvider>
   orderbook_provider() → Box<dyn OrderBookProvider>
   corporate_action_provider() → Box<dyn CorporateActionProvider>
+  shareholder_movement_provider() → Box<dyn ShareholderMovementProvider>
 ```
 
 `ProviderKind::Stockbit` serves quotes (and, with a session, daily history):

docs/STOCKBIT.md

@@ -167,19 +167,33 @@ lists are not errors. A row whose dates are all placeholders is dropped.
 
 ### Endpoint
 
-`GET /insider/company/majorholder?symbol=&insider=&date_start=&date_end=&page=`;
-all parameters optional. 50 rows a page, `data.is_more` for the next page.
+Rows shipped as `idx ownership movements` and `get_shareholder_movements`;
+the summary score is next.
+
+`GET /insider/company/majorholder?symbol=&insider=&date_start=&date_end=&action_type=&source_type=&page=`;
+all parameters optional, all filtered by Stockbit (checked 2026-11-03).
+`date_start` / `date_end` are YYYY-MM-DD; `insider` is the holder id, which is
+the row's `id` (not unique per row); `action_type` takes `ACTION_TYPE_BUY`,
+`_SELL`, `_TRANSFER`, `_CROSS` or `_CORPACTION` (the app's filter list);
+`source_type` takes `SOURCE_TYPE_IDX` or `_KSEI`. `page` counts from 1. 50 rows
+a page, `data.is_more` for the next page; a busy day has more than 50 rows.
 Without `symbol` it is market-wide, newest first: on 2026-11-03 the newest rows
 were from 2026-11-02. BBCA's 50 rows span 2024-03-22 to 2026-03-25.
 
 Each row (`data.movement[]`): `name`, `symbol`, `date` (`"25 Mar 26"`),
 `previous` / `current` / `changes` `{value: shares as "193,206", percentage}`,
-`action_type` (`ACTION_TYPE_BUY|SELL|TRANSFER`), `nationality`
+`action_type` (`ACTION_TYPE_BUY`, `_SELL`, `_TRANSFER`, `_CROSS`,
+`_RIGHT_ISSUE`, `_PRIVATE_PLACEMENT`, `_TENDER_OFFER`; the bundle also names
+`_BONUS_STOCK`, `_DIVIDEND_STOCK`, `_DIVIDEND_CASH`), `nationality`
 (`NATIONALITY_TYPE_LOCAL|FOREIGN`), `badges` (`SHAREHOLDER_BADGE_DIREKTUR`,
 `..._KOMISARIS`), `price.raw.value`, `value.raw.value` (IDR),
 `is_estimated_price`, `purpose` (free text such as "Pembelian", "Investasi"),
 `data_source.type` (`SOURCE_TYPE_IDX` for insider disclosures,
 `SOURCE_TYPE_KSEI` for 5% holder changes), `broker_detail` (empty so far).
+KSEI rows carry an estimated price (`is_estimated_price`: true); IDX rows
+mostly the trade price, though crossings can be estimated too. `CROSS` rows
+name securities firms as the holder. A rights issue can change the stake
+with no change in shares (dilution).
 
 ### Relation to `ownership`
 
@@ -208,10 +222,15 @@ Yahoo prices, forward 5/20/60-session returns against IHSG).
 
 ### Surface
 
-- `idx ownership movements [SYM] [--from DATE] [--to DATE] [--holder NAME]
-  [--action buy|sell|transfer] [--pages N]`: rows, newest first.
-- `idx ownership movements --summary [--from DATE]`: the per-symbol score.
-- MCP: `get_shareholder_movements {symbol?, from?, to?, holder?, pages?}`.
+- `idx ownership movements [SYM] [--from DATE] [--to DATE] [--holder ID]
+  [--action buy|sell|transfer|cross|corporate-action] [--source idx|ksei]
+  [--pages N]`: rows, newest first (shipped). `--holder` takes the holder id
+  rather than a name: Stockbit filters by id, and a name search would only see
+  the pages already read.
+- MCP: `get_shareholder_movements {symbol?, from?, to?, holder_id?, action?,
+  source?, pages?}` (shipped).
+- Next: `idx ownership movements --summary [--from DATE]`, the per-symbol
+  score.
 
 ## P2 and P3
 
@@ -236,7 +255,7 @@ Yahoo prices, forward 5/20/60-session returns against IHSG).
    states (done 2026-11-03).
 2. Corporate actions (parsers, `stocks actions`, `stocks calendar`, MCP,
    goldens) (done).
-3. Shareholder movements, rows first, then `--summary`.
+3. Shareholder movements, rows first (done), then `--summary`.
 4. Event study for the movement score; P2 by demand.
 
 ## Open questions