P2.2: Verify write path implementation - all acceptance tests pass

Verified the complete write path implementation in
crates/miroir-proxy/src/routes/documents.rs:

- POST /indexes/{uid}/documents - Add documents
- PUT /indexes/{uid}/documents - Replace documents
- DELETE /indexes/{uid}/documents/{id} - Delete single document
- DELETE /indexes/{uid}/documents - Delete by IDs array or filter

All key features verified:
- Primary key extraction on hot path
- _miroir_shard injection into every document
- Reserved field validation (400 error for _miroir_shard)
- Two-rule quorum (per-group quorum + overall success)
- X-Miroir-Degraded header when groups miss quorum
- HTTP 503 miroir_no_quorum when no group meets quorum
- Per-batch document grouping by shard
- Independent per-shard routing for DELETE by IDs
- Broadcast routing for DELETE by filter

Acceptance tests: 11/11 passing
Build: Successful

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.beads/traces/miroir-cdo.6/metadata.json

@@ -3,13 +3,13 @@
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   "provider": "zai",
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+  "outcome": "success",
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.beads/traces/miroir-cdo.6/stderr.txt

@@ -0,0 +1,2 @@
+SessionEnd hook [/home/coding/.ccdash/hooks/session-end.sh] failed: /bin/sh: line 1: /home/coding/.ccdash/hooks/session-end.sh: cannot execute: required file not found
+

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@@ -1 +1 @@
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