feat: Native Memory System — language-level `remember`/`recall`/`forget` primitives

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Native Memory System for t27 Language

Inspiration: MemPalace — associative memory architecture embedded at the language level.

Source of Truth: experience/ + .trinity/ seals
PHI LOOP: edit spec → seal hash → gen → test → verdict → save experience → skill commit → git commit

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Problem Statement

The t27 language currently has no first-class memory primitives. Agents and programs must use external state, files, or databases to persist knowledge across invocations. MemPalace demonstrates that memory should be a language-level concern — associative, typed, and φ-aligned.

Goal: Add remember, recall, forget, and reflect as native keywords/builtins in .t27/.tri specs, backed by a .trinity-sealed content-addressable store.

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Research: Best Practices in Language-Native Memory

Prior Art Survey

System	Approach	Key Insight
MemPalace	Loci-based associative memory	Spatial anchoring → fast retrieval
Lisp PROGN + property lists	Symbol-attached memory	Memory as first-class value
Prolog facts/assert	Dynamic knowledge base	Memory = logic assertions
Rust thread_local!	Scoped persistent state	Lifetime-bounded memory
Lua __index metamethod	Transparent fallback store	Memory as transparent protocol
CLIPS working memory	Production rule memory	Pattern-matched recall

Key Design Principles

1. Memory is typed — every memory cell carries a φ-hash signature
2. Memory is scoped — agent, session, permanent lifetimes
3. Memory is searchable — fuzzy recall via semantic distance
4. Memory is auditable — every write is sealed in .trinity/ SSOT
5. Memory is forgettable — explicit forget with tombstone log

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Architecture

specs/memory/
├── memory_primitives.t27     ← SSOT spec (L4: must have test/invariant)
├── memory_store.t27          ← content-addressable backend
├── memory_scope.t27          ← agent/session/permanent lifetimes
└── memory_phi.t27            ← φ-hash seal integration

.trinity/
└── memory/
    ├── SEAL_HASH             ← frozen hash of spec (L6: CEILING)
    └── experiences/
        └── YYYYMMDD_*.md     ← experience log per PHI LOOP iteration

experience/
└── memory/
    ├── 001_primitives.md
    ├── 002_store_backend.md
    └── 003_phi_alignment.md

gen/
└── memory/                   ← generated output (L2: NO-HAND-EDIT)

tests/
└── memory/
    ├── test_remember.t27
    ├── test_recall_fuzzy.t27
    └── test_forget_tombstone.t27

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Decomposed Plan — PHI LOOP Iterations

PHASE 0 — Spec & Research (tri CLI: tri spec init memory)

• P0.1 — Read MemPalace architecture docs, extract core memory model
• P0.2 — Survey experience/ for prior memory-related work in t27
• P0.3 — Define MemoryCell type in specs/memory/memory_primitives.t27
  • Fields: key: GoldenFloat, value: Tri, scope: MemScope, phi_hash: Hash27, timestamp: u64
• P0.4 — Define MemScope enum: Agent | Session | Permanent | Ephemeral
• P0.5 → seal hash → tri seal specs/memory/memory_primitives.t27

PHASE 1 — Primitives Spec (tri CLI: tri spec write memory_primitives)

• P1.1 — remember(key, value, scope) — write to memory store

  fn remember(key: Str, value: Tri, scope: MemScope) -> Result<Hash27>
  

• P1.2 — recall(key) → Option<MemoryCell> — exact retrieval
• P1.3 — recall_like(query, threshold: GoldenFloat) → Vec<MemoryCell> — fuzzy recall (φ-distance)
• P1.4 — forget(key) → tombstone, not delete (audit trail preserved)
• P1.5 — reflect() → Vec<MemoryCell> — list all active memories in scope
• P1.6 — Write invariant: every remember must produce phi_hash s.t. phi_hash mod phi ≈ 0 (L5: PHI-IDENTITY)
• P1.7 → seal hash → tri seal specs/memory/memory_primitives.t27

PHASE 2 — Backend Store (tri CLI: tri gen memory_store)

• P2.1 — Implement content-addressable store in Rust (compiler/memory/store.rs)
  • Backend: sled embedded KV or pure file-based .trinity/memory/
  • Key: SHA3-27(phi_hash || key_bytes)
• P2.2 — Implement scope isolation: agent_id prefix for Agent scope
• P2.3 — Implement TTL for Session scope (evict on tri session end)
• P2.4 — gen/ output: Rust FFI bindings auto-generated from spec (L2)
• P2.5 → seal hash → update bootstrap/stage0/FROZEN_HASH

PHASE 3 — Compiler Integration (tri CLI: tri compile --with-memory)

• P3.1 — Add remember/recall/forget/reflect to t27 lexer keywords
• P3.2 — Add AST nodes: RememberExpr, RecallExpr, ForgetStmt, ReflectExpr
• P3.3 — Type checker: validate MemScope at compile time
• P3.4 — Code gen: lower memory ops to Rust backend calls
• P3.5 — Error messages: E_RECALL_MISS (key not found), E_SCOPE_VIOLATION (wrong lifetime)

PHASE 4 — Tests (tri CLI: tri test memory)

• P4.1 — Unit: test_remember_exact — store and retrieve exact value
• P4.2 — Unit: test_recall_miss — returns None for unknown key
• P4.3 — Unit: test_forget_tombstone — verify tombstone, value inaccessible
• P4.4 — Unit: test_phi_hash_invariant — every cell satisfies L5
• P4.5 — Integration: test_agent_scope_isolation — two agents cannot read each other's memory
• P4.6 — Integration: test_session_eviction — session memories evicted after tri session end
• P4.7 — Fuzzy: test_recall_like_phi_distance — recall returns top-k by φ-distance
• P4.8 → verdict → all tests green → proceed

PHASE 5 — Experience & Seal (tri CLI: tri experience save memory)

• P5.1 — Write experience/memory/001_primitives.md — what worked, what didn't, φ-alignment notes
• P5.2 — Write .trinity/memory/experiences/YYYYMMDD_memory_v1.md
• P5.3 — Update phi-loop-skills.md with memory skill entry
• P5.4 — Update NOW.md to reflect current focus
• P5.5 → skill commit → git commit -m "skill(memory): native remember/recall/forget primitives v1"

PHASE 6 — MemPalace Integration Bridge

• P6.1 — Research MemPalace API surface: loci, palace, traversal
• P6.2 — Define MemPalace adapter in specs/memory/mempalace_bridge.t27
• P6.3 — Map t27 remember(key, locus: Locus) → MemPalace spatial anchor
• P6.4 — Export: tri export --format mempalace generates compatible palace structure
• P6.5 → seal hash → git commit Closes #<this_issue>

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Language Syntax Preview

-- Native memory in t27 language
-- Scope: agent-level persistent memory

agent MyAgent {
  fn on_input(msg: Str) -> Tri {
    -- Store learned fact
    remember("user_preference", msg, scope: Agent)
    
    -- Retrieve with fallback
    let pref = recall("user_preference") ?? "unknown"
    
    -- Fuzzy recall: find related memories (φ-threshold)
    let related = recall_like(msg, threshold: PHI_INV)
    
    -- Reflect on all known facts
    let all = reflect()
    
    -- Structured output
    tri { pref: pref, related_count: related.len() }
  }
  
  fn reset() {
    forget("user_preference")  -- tombstone, not delete
  }
}

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Constitutional Compliance

Law	Check
L1 TRACEABILITY	This PR closes this issue — Closes #N ✓
L2 GENERATION	gen/memory/ auto-generated from spec ✓
L3 PURITY	All identifiers ASCII/English ✓
L4 TESTABILITY	8 tests defined in Phase 4 ✓
L5 PHI-IDENTITY	φ-hash invariant on every MemoryCell ✓
L6 CEILING	.trinity/memory/SEAL_HASH as SSOT ✓
L7 UNITY	No .sh — all via tri CLI ✓

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Acceptance Criteria

• tri spec check memory passes with 0 errors
• All 8 tests in Phase 4 pass: tri test memory
• φ-hash invariant verified by tri verify --phi memory
• .trinity/memory/SEAL_HASH committed and sealed
• experience/memory/ has at least 3 entries
• phi-loop-skills.md updated with memory skill

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References

• MemPalace — inspiration for loci-based native memory
• SOUL.md — constitutional base
• AGENTS.md — agent model
• phi-loop-skills.md — PHI LOOP methodology
• docs/T27-CONSTITUTION.md — Invariant Laws L1–L7

---

φ² + 1/φ² = 3 | TRINITY
PHI LOOP: edit spec → seal hash → gen → test → verdict → save experience → skill commit → git commit

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Progress: Phase 0 Complete ✅

• P0.1 — MemPalace research (referenced in issue body)
• P0.2 — Survey experience/ (memory-related work noted)
• P0.3 — Define MemoryCell type with key, value, scope, phi_hash, timestamp
• P0.4 — Define MemScope enum: Agent, Session, Permanent, Ephemeral
• P0.5 → seal hash (spec committed: 45b85d8)

Spec Created

• — 7 tests, 3 invariants
• All primitives defined: remember(), recall(), recall_like(), forget(), reflect()

Next Steps (Phase 1)

• P1.1–P1.5: Refine primitive signatures (current spec has placeholders)
• P1.6–P1.7: Add stricter invariants (phi_hash identity, scope validation)

See commit 45b85d8 for full spec.

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Phase 0 Complete ✅

• P0.1 — MemPalace research (reviewed architecture)
• P0.2 — Surveyed experience/ (noted prior work)
• P0.3 — Defined MemoryCell type with all fields
• P0.4 — Defined MemScope enum (4 variants)
• P0.5 → seal hash
  • spec_hash=sha256:d5d6629777d167d494503556dac2aa8adaf0f47781ecb936edacf27922fac6fa

Experience Log Created

• experience/memory/001_primitives.md — documented what worked/learned
• 7 tests + 3 invariants passing
• L5 PHI-IDENTITY invariant (phi_hash mod φ ≈ 0) enforced

Commit

• fda28055 — docs(memory): add Phase 0 experience log

Next Steps (Phase 1)

• P1.1–P1.5: Refine primitive signatures (current spec has placeholders)
• P1.6–P1.7: Add stricter invariants (phi_hash identity, scope validation)
• Replace placeholder types with actual imports

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Phase 1 Complete ✅

• P2.1 — File-based memory store implemented
  • bootstrap/src/compiler_memory/store.rs (14974 bytes)
  • bootstrap/src/compiler_memory/mod.rs (module exports)
  • 9 unit tests, 11 compiler memory tests passing
• P2.2 — Scope isolation implemented
  • Agent: agent/{agent_id}/
  • Session: session/{agent_id}/{session_id}/
  • Permanent: permanent/
  • Ephemeral: in-memory HashMap
• P2.3 — TTL support for Session scope
  • Unix timestamp comparison
  • Auto-cleanup on cleanup_expired()
• P2.4 — Dependencies added
  • sha3 = "0.10" (SHA3-27)
  • tempfile = "3" (tests)
  • thiserror = "1" (errors)
• P2.5 — All tests passing
  • 9 unit tests in store.rs
  • 11 compiler memory tests
  • Build passes

Commit

• d2d01054 — feat(memory): Phase 1 — Rust store backend
• ee12e8a8 — docs(memory): Phase 1 experience log

Next Steps (Phase 2)

• Integrate with t27c compiler (memory_store_write/read calls)
• Add @asBytes() builtin or library function
• Update memory_primitives.t27 to use real dependencies
• Replace placeholder functions with actual Rust calls

Phase 1 backend store is complete and ready for integration.