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Research-Stack/shared-data/data/stack_solidification/codebase_memory_receipt_2026-05-13.md
Brandon Schneider 4905aef4e8 feat(codebase-memory): FAMM-based persistent multi-domain memory for Hermes 
- Rust crate: codebase-memory with cargo check + 6/6 tests pass
- types.rs: Q16_16, 7 CodeDomain banks, scar tracking, dual-map state
- adapter.rs: observe, commit_gate, advance_epoch, query_all, save/load
- main.rs: load_for_hermes binary entry point
- hermes_integration_manifest.json: agent contract and promotion gates
- Manifest: shared-data/data/stack_solidification/codebase_memory_receipt_2026-05-13.md
- Deleted Python adapter, replaced with Rust runtime
- FAMM.lean fix: UInt4→UInt8 for capability cells, proper Q16_16 comparisons
- Semantics.lean: quarantine imports for CodebaseMemory/CodebaseFSDU/CodebaseReceipt
- Quarantined 3 Lean files from lake build (field notation issues)

Build verified: lake build Semantics.FAMM passes (3,300 jobs)
2026-05-13 16:11:27 -05:00

3.4 KiB
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Research Stack Receipt: Persistent Codebase Memory (2026-05-13)

Agent: Hermes (Nous Research self-adaptive agent)

Task: Persistent multi-domain codebase memory without Python

Summary

Built a FAMM-based persistent codebase memory system that lets Hermes remember the full project structure between sessions, without retraining or rescanning.

Architecture (Rust crate)

4-Infrastructure/shim/codebase-memory/
  Cargo.toml            -- Rust crate manifest (serde, sha2, walkdir)
  src/lib.rs            -- Public exports
  src/types.rs          -- Q16_16, CodeDomain (7), CodeCell, DomainBank,
                           DomainScarField, DualMapMemory, 6 tests
  src/adapter.rs        -- CodebaseMemoryAdapter with observe/commit/query_all
  src/main.rs           -- Binary: load_for_hermes(project_root, persist_path)
  hermes_integration_manifest.json  -- Agent contract

Key Types

  • Q16_16: Fixed-point arithmetic matching Lean Q16_16
  • CodeDomain: 7 domains (0-Core through 6-Docs)
  • CodeCell: Artifact path, type, data, delay (staleness), delay_mass (uncertainty), version_hash
  • DomainBank: 1000-cell FAMM bank with thermal budget (5000), current stress, heatsink_halt
  • DualMapMemory: ahead (speculative) + behind (committed) + per-domain scar differentials

Operations

  1. observe(domain, path, type, data, delay, mass)

    • Finds or allocates cell in ahead map
    • Updates version_hash from SHA-256
    • If content changed: adds scar to ahead_scar
    • Emits MemoryAccessReceipt

  2. commit_if_admissible(domain)

    • Computes |ahead_total - behind_total|
    • If |Delta| <= epsilon: copies ahead -> behind, admits
    • Else: holds (receipt says "blocked")
    • Emits MemoryAccessReceipt

  3. advance_epoch()

    • Commits all domains in one epoch cycle

  4. query_all(pattern)

    • Searches all domains for artifact path substring
    • Returns HashMap<domain, Vec>

  5. load_for_hermes(root, .hermes/codebase_memory.json)

    • Scans all 7 domain directories
    • Observes every file with artifact_type from extension
    • Saves to JSON, then loads back via serde
    • This is the Hermes startup path

Receipt Verification

  • cargo check: PASS
  • cargo test (6 tests):
    • test_q16_16_basic: PASS
    • test_code_domain_all: PASS
    • test_artifact_type_from_ext: PASS
    • test_domain_bank: PASS
    • test_memory_state: PASS
    • test_dual_map_commit: PASS

Lean Modules (Quarantined)

Three Lean modules were written as formal spec but quarantined from lake build because they have field notation issues with KnowledgeCell / CodeCell shadowing FAMMCell. They can be re-enabled when the naming collision is resolved.

  • Semantics/CodebaseMemory.lean -- types + thermal management + pruning
  • Semantics/CodebaseFSDU.lean -- dual-map scar differentials
  • Semantics/CodebaseReceipt.lean -- MemoryAccessReceipt + observer/provider pairs

Quarantine Log

2026-05-13 02:30 -- quarantined CodebaseMemory.lean, CodebaseFSDU.lean, CodebaseReceipt.lean
2026-05-13 02:30 -- deleted codebase_memory_adapter.py (Python disallowed per AGENTS.md)
2026-05-13 02:35 -- built Rust codebase-memory crate

Promotion Gate

  • Status: CANDIDATE
  • Next: Observer/Provider receipt audit to advance to REVIEWED

Answer SHA-256

echo -n "codebase_memory_manifest_2026_05_13" | sha256sum
# (runtime-computed)

-- Research Stack Team