PR-1.1 — Bytecode Legacy Inventory & Deletion Map

Goal
- Provide an explicit, reviewable inventory of all RC/HIP-era artifacts (opcodes, traps, types, helpers, docs, tests) and a deletion map for the ISA reset.
- No code changes in this PR — documentation only. Follow-up PRs will execute the deletions/edits.

Repository root
- runtime (this file lives at docs/bytecode/RESET_LEGACY_MAP.md)

Quick grep guide (reviewers)
- Use these commands from the project root. They avoid target/ and other generated dirs.

```
# Core RC/HIP signal words
grep -RIn --exclude-dir target --exclude-dir dist-staging --exclude-dir dist-workspace \
  -e '\bHIP\b' -e '\bgate\b' -e 'GATE_' -e '\bretain\b' -e '\brelease\b' -e '\bscope\b' .

# Legacy opcodes (bytecode + VM handlers)
grep -RIn --exclude-dir target \
  -e 'GateLoad' -e 'GateStore' -e 'GateBeginPeek' -e 'GateEndPeek' \
  -e 'GateBeginBorrow' -e 'GateEndBorrow' -e 'GateBeginMutate' -e 'GateEndMutate' \
  -e 'GateRetain' -e 'GateRelease' -e 'Alloc' \
  crates/console/prometeu-bytecode crates/console/prometeu-vm

# Scope-related (inventory only; not necessarily to delete)
grep -RIn --exclude-dir target -e 'PushScope' -e 'PopScope' crates/console

# Trap codes inventory (post-reset, check for any lingering gate-specific traps)
grep -RIn --exclude-dir target \
  -e '\bTRAP_\w\+' \
  crates/console/prometeu-bytecode crates/console/prometeu-vm | grep -Ei 'gate|heap|hip' -n || true

# Value::Gate usages
grep -RIn --exclude-dir target -e 'Value::Gate' crates/console

# Docs that describe HIP/RC model
grep -RIn --exclude-dir target --include '*.md' -e '\bHIP\b' docs files
```

Legend for the deletion map
- Remove: file or symbol slated for deletion in follow-up PRs.
- Edit: file will survive but needs edits to remove/rename legacy parts.
- Keep: file or symbol remains under the GC stack+heap model (not part of RC/HIP removal) — listed here when helpful for context.


1) Legacy opcodes (RC/HIP)

Remove — OpCode variants (definitions and all references)
- prometeu-bytecode
  - crates/console/prometeu-bytecode/src/opcode.rs
    - OpCode::Alloc
    - OpCode::GateLoad
    - OpCode::GateStore
    - OpCode::GateBeginPeek, OpCode::GateEndPeek
    - OpCode::GateBeginBorrow, OpCode::GateEndBorrow
    - OpCode::GateBeginMutate, OpCode::GateEndMutate
    - OpCode::GateRetain, OpCode::GateRelease
    - Notes: also appears in TryFrom<u16> mapping and in cycles() table inside same file.
  - crates/console/prometeu-bytecode/src/opcode_spec.rs
    - Spec entries for each of the above (names: GATE_LOAD, GATE_STORE, GATE_BEGIN_PEEK, ... GATE_RELEASE; ALLOC).
  - crates/console/prometeu-bytecode/src/decoder.rs
    - Keep file. No direct legacy handling beyond general decoding; remains after removing legacy opcodes.
  - crates/console/prometeu-bytecode/src/model.rs
    - Keep file. No opcode definitions here; only payload helpers like imm_u32x2 are generic. No deletion but re-check comments if they reference ALLOC semantics.
  - crates/console/prometeu-bytecode/src/value.rs
    - Edit: enum Value includes Gate(usize). This is HIP-only; plan to remove variant and downstream usages when ISA reset lands.
  - crates/console/prometeu-bytecode/src/program_image.rs
    - Edit: maps Value to ConstantPoolEntry; has a Value::Gate arm that turns into Null. Will be adjusted once Value::Gate is removed.

- prometeu-vm (execution semantics for legacy opcodes)
  - crates/console/prometeu-vm/src/virtual_machine.rs
    - Match arms for: Alloc, GateLoad/Store, GateBegin*/End* (Peek/Borrow/Mutate), GateRetain/Release.
    - Gate pool and heap structures (GateEntry, GateId), resolve_gate() helper, and related fields in VM state.
    - Unit tests tied to HIP/RC model, e.g.:
      - fn test_hip_traps_oob()
      - fn test_hip_traps_type()
      - fn test_invalid_gate_traps()
      - fn test_gate_ids_distinct_and_round_trip()
  - crates/console/prometeu-vm/src/scope_frame.rs
    - Inventory only (scope handling). Scope is not inherently HIP, keep or revise later under GC if needed.

- prometeu-hal / prometeu-system (touch points)
  - crates/console/prometeu-hal/src/host_return.rs
    - Pushes Value::Gate in some host return paths. Will require edits once Value::Gate is removed.
  - crates/console/prometeu-system/*
    - No direct HIP opcode handling expected, but grep for Value::Gate and GATE_ in formatting/printing if any.


2) Trap codes (RC/HIP)

Remove — gate-specific traps (delete constants and all usages)
- crates/console/prometeu-bytecode/src/abi.rs
  - Remove identifiers tied to HIP/gate semantics

Keep — still meaningful under GC model (names may be revised later, but remain functionally)
- crates/console/prometeu-bytecode/src/abi.rs
  - TRAP_OOB (0x03) — out-of-bounds (generic)
  - TRAP_INVALID_SYSCALL (0x0000_0007)
  - TRAP_STACK_UNDERFLOW (0x0000_0008)
  - TRAP_INVALID_LOCAL (0x0000_0009)
  - TRAP_DIV_ZERO (0x0000_000A)
  - TRAP_INVALID_FUNC (0x0000_000B)
  - TRAP_BAD_RET_SLOTS (0x0000_000C)
  - TRAP_TYPE — retained; semantics generalized to non-HIP type mismatches

Usages to edit alongside removal
- crates/console/prometeu-vm/src/virtual_machine.rs
  - Imports: remove any gate-specific trap imports
  - resolve_gate() and gate handlers construct TrapInfo with those codes
  - Tests asserting these trap codes


3) Legacy terminology occurrences (inventory)

Gate/GATE_
- Files containing gate-centric logic or names:
  - crates/console/prometeu-bytecode/src/opcode.rs — Gate* opcodes
  - crates/console/prometeu-bytecode/src/opcode_spec.rs — GATE_* names
  - crates/console/prometeu-bytecode/src/value.rs — Value::Gate
  - crates/console/prometeu-vm/src/virtual_machine.rs — GateEntry, GateId, handlers, tests
  - docs/specs/pbs/Prometeu VM Memory model.md — extensive HIP/gate sections
  - docs/specs/pbs/Prometeu Scripting - Prometeu Bytecode Script (PBS).md — HIP/gate model and APIs

Retain/Release (RC semantics)
- Opcode names: GateRetain, GateRelease — bytecode + VM
- Docs: reference counting sections in PBS and VM Memory model docs

Scope
- Opcode names: PushScope, PopScope — present in opcode.rs/opcode_spec.rs and executed in VM
- VM scope_frame.rs and scope_stack usage — not inherently HIP, but inventoried here per task wording

HIP (Heap Interface Protocol)
- Labelled sections/comments:
  - crates/console/prometeu-bytecode/src/opcode.rs — comment header “HIP (Heap Interface Protocol)” above Gate* opcodes
  - docs/specs/pbs/Prometeu VM Memory model.md — HIP-specific architecture
  - docs/specs/pbs/Prometeu Scripting - Prometeu Bytecode Script (PBS).md — HIP world, borrow/mutate/peek, RC
  - files/Borrow Mutate - Compiler GC.md — discusses removing RC/HIP in favor of GC; keep as design context but will need text updates after reset


4) Deletion map (by module)

Will be removed outright (symbols or blocks)
- prometeu-bytecode
  - opcode.rs: all Gate* variants and Alloc variant; TryFrom/encoding IDs and cycles for those
  - opcode_spec.rs: corresponding spec arms (GATE_*, ALLOC)
  - abi.rs: gate-specific trap constants
- prometeu-vm
  - virtual_machine.rs: handlers for Alloc and all Gate* opcodes; GateEntry/GateId data structures; resolve_gate(); HIP-focused unit tests listed above

Will be edited (kept but changed)
- prometeu-bytecode
  - value.rs: remove Value::Gate and update Display/eq code paths
  - program_image.rs: remove/adjust Value::Gate mapping in constant pool materialization
  - decoder.rs: no semantic change; ensure UnknownOpcode remains deterministic (already the case)
- prometeu-vm
  - virtual_machine.rs: remove trap imports for legacy codes; update match to exclude removed opcodes; prune gate/heap fields
  - scope_frame.rs: keep unless later ISA changes require scope model changes (not part of HIP removal)
- prometeu-hal
  - host_return.rs: stop producing Value::Gate once Value enum loses Gate

Docs to remove or rewrite (architecture reset)
- docs/specs/pbs/Prometeu VM Memory model.md — replace HIP/RC model with GC stack+heap model
- docs/specs/pbs/Prometeu Scripting - Prometeu Bytecode Script (PBS).md — remove HIP world/RC sections; update storage semantics
- Any disasm examples or golden outputs referring to GATE_* or ALLOC — update after opcode removal

Tests/fixtures affected
- Unit tests in prometeu-vm referencing HIP traps or Gate behavior:
  - test_hip_traps_oob, test_hip_traps_type, test_invalid_gate_traps, test_gate_ids_distinct_and_round_trip
- Golden disassemblies under test-cartridges/*/build/program.disasm.txt may include GATE_* lines — grep and update in follow-up PRs


5) Reviewer checklist for follow-up PRs
- Bytecode enum/spec cleaned: no Gate*/Alloc variants remain
- VM execution has no references to Gate/GateEntry/resolve_gate
- Value enum no longer has Gate; all Display/eq/serde paths fixed
- Trap ABI contains only GC-era traps (OOB, stack underflow, invalid func/local/syscall, div by zero, bad ret slots, etc.)
- Disassembler/printers do not print legacy names (GATE_*, ALLOC)
- Docs no longer mention HIP/RC; updated to GC model
- All tests green (`cargo test`) after deletions and necessary test updates


6) Notes
- This document inventories occurrences proactively, but exact refactors in the reset may slightly shift responsibilities (e.g., how storage allocation appears under GC). Use the grep guide to double-check any stragglers during code deletion PRs.