v0.10.0 memory-plus axes 1-4: Merkle manifests, dedup pool, aged zlib, substrate tokenizer

Pushing compression ceiling beyond v1.0's 297× context ratio along four
orthogonal axes. All four ship with round-trip verification.

Axis 1 — Merkle manifest hashes (omc_memory_create_manifest +
omc_memory_recall_manifest). One manifest hash references N leaf hashes.
Tested on 19 stored chapters: 1 manifest hash (5 tokens) replaces 19
flat hash refs (95 tokens). Context cost reduction: 19× over v1.0,
5,356× vs raw chapter content in context.

Axis 2 — Cross-namespace dedup pool. Bodies live in shared
~/.omc/memory/_pool/<shard>/<hash>.txt; namespace dirs hold only index.
Same content stored in K namespaces = 1 body file. Tested 5-way dup:
naive 29,505 bytes → pool 5,901 bytes (5× disk).

Axis 3 — fibtier-aware progressive compression (omc_memory_compact).
Aged pool bodies rewritten as zlib-deflated with `OMCZ` magic prefix.
Tested on real chapter: 6,008 → 2,743 bytes (2.19× disk).

Axis 4 — substrate-aware tokenizer compaction (omc_memory_compact_substrate).
Aged bodies re-encoded via tokenizer::encode + varint + deflate with
`OMCT` magic. Tested on OMC code: 8,018 → 3,383 bytes (2.37× disk).
Honest comparison: roughly ties OMCZ zlib (2.48× on similar content).
The substrate-native path is a substrate-tokenizer integration win
even though raw compression is on par with zlib.

Architecture:
  recall path transparently inflates OMCZ + OMCT bodies
  legacy per-namespace storage still works as fallback
  6 new MCP tools (compact, compact_substrate, create_manifest,
                   recall_manifest, plus the existing 5)
  flate2 added to omnimcode-core deps (rust_backend, no system zlib)

Compounding ceiling so far:
  Axis 1: 5,356× context compression (manifest hash for 19 chapters)
  Axis 2: 5× disk on duplicated content (linear with namespace count)
  Axis 3: 2.19× disk on aged content via zlib
  Axis 4: 2.37× disk on aged content via substrate tokenizer (ties Axis 3)

Tests: 1111/1111 OMC tests still pass; round-trip verified for OMCZ
and OMCT bodies via MCP integration test.

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

Author: RandomCoder-lab

Cargo.lock

@@ -15,6 +15,10 @@ path = "src/lib.rs"
 [dependencies]
 regex = "1.10"
 thiserror = "1.0"
+# v0.9.3 Axis 3 — aged-tier memory compression. Used by the MemoryStore
+# `compact_namespace` operation to rewrite old pool bodies as zlib-deflated
+# blobs. Adds <100KB to the binary.
+flate2 = { version = "1.0", default-features = false, features = ["rust_backend"] }
 serde_json = "1.0"
 sha2 = "0.10"
 base64 = "0.22"