docs: claim mission rfc-0201-phase-2c for Blob projection/selection testing

Move from open to claimed. Phase 2c verifies Blob works in SQL
projection/selection contexts - primarily integration testing.

Author: mmacedoeu

missions/claimed/rfc-0201-phase-2c-blob-projection-selection.md

@@ -0,0 +1,76 @@
+# Mission: RFC-0201 Phase 2c — Blob in Projection/Selection
+
+## Status
+
+Claimed
+
+## Claimant
+
+@claude-agent
+
+## RFC
+
+- RFC-0201 (Storage): Binary BLOB Type for Deterministic Hash Storage — Phase 2c
+- RFC-0127 (Numeric): DCS Blob Amendment — Accepted
+
+## Dependencies
+
+- Phase 1 (core BYTEA): DataType::Blob, Value::Blob, wire tag 12 — **Complete**
+- Phase 2b (Blob Equality in Expression Evaluation) — recommended before this phase
+
+## Context
+
+Phase 2c verifies that Blob columns work correctly in SQL projection and selection contexts:
+
+```sql
+SELECT key_hash, signature FROM usage_ledger WHERE event_id = $1;
+```
+
+**What's needed:**
+- Integration tests verifying Blob columns appear correctly in SELECT results
+- Verify `Value::Blob` serializes correctly through the query result encoding path
+- Hash index usage for Blob equality in WHERE clauses
+
+**stoolap implementation status:**
+- `Value::Blob` already has full comparison (byte-by-byte), hashing, and Display implemented
+- `serialize_value` / `deserialize_value` handle wire tag 12 correctly
+- Hash table hashing already handles `Value::Blob`
+- Phase 2a (hash index) and 2b (expression equality) are likely already satisfied by existing code
+
+## Acceptance Criteria
+
+- [ ] Integration test: `CREATE TABLE t (id INTEGER, key_hash BYTEA(32)); INSERT INTO t VALUES (1, $1); SELECT key_hash FROM t WHERE id = 1;`
+- [ ] Verify result set correctly returns Blob value (hex-encoded in wire response)
+- [ ] Verify Blob equality works in WHERE clause with hash index available
+- [ ] `cargo test --lib` passes with 0 failures
+- [ ] `cargo clippy --all-targets --all-features -- -D warnings` passes
+
+## Technical Notes
+
+### Blob Wire Format (per RFC-0201)
+
+Format: `[u8:12][u32_be:length][u8..len:data]`
+- Tag 12 for Blob
+- Big-endian length prefix
+- Raw bytes (no UTF-8 validation)
+
+### Result Set Encoding
+
+stoolap's result set uses `serialize_value` for encoding column values. This already handles `Value::Blob` correctly — no special result encoding needed.
+
+## Key Files to Modify
+
+| File | Change |
+|------|--------|
+| `tests/` | Add integration tests for Blob in projection/selection |
+
+## Design Reference
+
+- RFC-0201 Phase 2c specification: `rfcs/accepted/storage/0201-binary-blob-type-support.md` §Phase 2c
+- Existing Blob implementation: `src/core/value.rs`, `src/storage/mvcc/persistence.rs`
+
+---
+
+**Mission Type:** Testing / Verification
+**Priority:** Medium
+**Phase:** Phase 2c