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Part 1 — close-positions CLI (#65): - Add `close-positions` subcommand delegating to `close_open_positions()`. - Accepts repeated `--symbol` and `--ticket` filters (AND semantics). - Supports `--dry-run` (no `--yes` required); live execution requires `--yes`. - Fails closed with `BadParameter` when neither `--symbol` nor `--ticket` is given. - Exports normalized `OrderExecutionResult` list as a DataFrame (request/response serialized as JSON strings for clean CSV/JSON/Parquet/SQLite output). - `order-send` remains the raw expert path; `close-positions` is the safer high-level helper that builds correct close requests automatically. Part 2 — ProjectionMode and replace_symbol (#66): - Add `ProjectionMode = Literal["add", "replace_symbol"]` type alias. - Add optional `projection_mode` parameter to `calculate_symbol_group_margin_ratio`. Default `"add"` preserves existing additive behavior. `"replace_symbol"` subtracts current margin for `new_symbol`, then adds candidate margin — the subtraction and addition are atomic (suppressed together). - Export `ProjectionMode` from `mt5cli` and add to `STABLE_SDK_EXPORTS`. - No mteor-specific strategy, risk-threshold, or policy logic added. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>