feat: add batch orchestration rules

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

rules/batch-orchestration.md

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+# Batch Orchestration Rules
+
+## Orchestrator Constraints
+- The orchestrator only reads task.md and subagent summaries — never full output files
+- The orchestrator only processes tasks from the active phase (defined in CLAUDE.md "Aktiver Scope")
+- Shared state files (status.md, decisions-log.md, task.md) are only written by the orchestrator, never by subagents
+- Phase-specific shared artifacts (e.g., capabilities-inventory.md) are updated only by the orchestrator during consolidation
+- The orchestrator never triggers /project:phase-transition or starts tasks from the next phase
+- When all DoD items of the active phase are complete: hard stop, inform user
+- Missing batch parameters (items, checkpoint mode) are always queried interactively before starting
+
+## Subagent Constraints
+- Each subagent writes only its own assigned output file
+- Subagents never write to task.md, status.md, decisions-log.md, or CLAUDE.md
+- Each subagent returns a 2-3 sentence summary as its return value
+
+## Task Parsing
+- The orchestrator parses the first section in task.md that contains ### sub-headings with - [ ] checkboxes (the work section)
+- Flat checkbox lists without sub-headings are treated as Definition of Done and ignored for dispatching
+- Tasks under the same ### heading form a parallelization group (can run concurrently)
+- Tasks under different ### headings are sequential (Group N+1 starts after Group N completes and checkpoint passes)
+
+## Context Loading
+- Base context (always): project rules of active phase + status.md
+- Phase-specific context: follow phase rules if they define context requirements (e.g., discovery-waves.md)
+- Task-specific context: if task declares (context: file1, file2), load those; otherwise load output files from prior groups
+- Prefer condensed documents over raw sources
+
+## Checkpoint Modes
+- after-each (default): pause after each group, show summaries, wait for user input
+- after-batch:N: run N groups, then pause
+- at-end: run all groups, consolidated review at end
+- Phase boundary: always a hard stop regardless of selected mode
+
+## Error Handling
+- On subagent failure: mark task as failed in checkpoint summary, do not block other parallel tasks in the same group
+- Failed tasks stay - [ ] in task.md (not marked as completed)
+- Failures are reported at the next checkpoint with the error details