test(INT-OBJECT-01G): accept construction protocols offline

.github/workflows/ci.yml

@@ -93,6 +93,8 @@ jobs:
       - run: uv run --no-sync python runtime/check_classes.py --target browser --corpus tests/fixtures/interpreter/generators.json --stepped --report build/generators-browser-stepped-report.json
       - run: uv run --no-sync python runtime/check_classes.py --target browser --corpus tests/fixtures/interpreter/generators.json --profile core-source/1 --report build/generators-core-browser-report.json
       - run: uv run --no-sync python runtime/check_classes.py --target browser --corpus tests/fixtures/interpreter/generators.json --profile core-source/1 --stepped --report build/generators-core-browser-stepped-report.json
+      - run: uv run --no-sync python runtime/check_classes.py --target browser --corpus tests/fixtures/interpreter/construction.json --report build/construction-browser-report.json
+      - run: uv run --no-sync python runtime/check_classes.py --target browser --corpus tests/fixtures/interpreter/construction.json --stepped --report build/construction-browser-stepped-report.json
       - run: uv run --no-sync python runtime/check_classes.py --target browser --corpus tests/fixtures/interpreter/object-protocols.json --report build/object-protocols-browser-report.json
       - run: uv run --no-sync python runtime/check_classes.py --target browser --corpus tests/fixtures/interpreter/object-protocols.json --stepped --report build/object-protocols-browser-stepped-report.json
       - run: uv run --no-sync python runtime/check_classes.py --target browser --report build/classes-browser-report.json
@@ -165,6 +167,7 @@ jobs:
       - run: node --test runtime/syntax.test.mjs
       - run: node --test runtime/function-binding.test.mjs
       - run: node --test runtime/object-protocols.test.mjs
+      - run: node --test runtime/construction.test.mjs
       - run: node --test runtime/generators.test.mjs
       - run: node --test runtime/functions.test.mjs
       - run: node --test runtime/execution.test.mjs
@@ -199,6 +202,8 @@ jobs:
       - run: python runtime/check_classes.py --target node --corpus tests/fixtures/interpreter/generators.json --stepped --report build/generators-node-stepped-report.json
       - run: python runtime/check_classes.py --target node --corpus tests/fixtures/interpreter/generators.json --profile core-source/1 --report build/generators-core-node-report.json
       - run: python runtime/check_classes.py --target node --corpus tests/fixtures/interpreter/generators.json --profile core-source/1 --stepped --report build/generators-core-node-stepped-report.json
+      - run: python runtime/check_classes.py --target node --corpus tests/fixtures/interpreter/construction.json --report build/construction-node-report.json
+      - run: python runtime/check_classes.py --target node --corpus tests/fixtures/interpreter/construction.json --stepped --report build/construction-node-stepped-report.json
       - run: python runtime/check_classes.py --target node --corpus tests/fixtures/interpreter/object-protocols.json --report build/object-protocols-node-report.json
       - run: python runtime/check_classes.py --target node --corpus tests/fixtures/interpreter/object-protocols.json --stepped --report build/object-protocols-node-stepped-report.json
       - run: python runtime/check_classes.py --target node --report build/classes-node-report.json

IMPLEMENTATION_PLAN_INTERPRETER.md

@@ -815,3 +815,25 @@ relations, metaclasses, builtin subclasses, custom attribute hooks, dynamic
 source, comprehension assignment expressions and async remain separately gated.
 The broader #120/#123 and #33/#34 milestones remain open; this checkpoint does
 not select a publication, deployment, dependency or host capability.
+
+### Construction and type checkpoint (2026-10-26)
+
+The finite O3/O4/O5 [construction contract](docs/interpreter-construction.md)
+adopts owned allocation/initialization, explicit and zero-argument super,
+lexical class cells, canonical adopted types and tuple type relations.
+Type-derived metaclasses support selection/conflicts, construction/call hooks,
+descriptors, ordinary dictionary namespaces and class-cell propagation through
+type.__new__. The additive class-meta opcode stays in explicit bytecode 5;
+core-source/1 remains bytecode 4.
+
+Independent Node/Chromium draining/stepped references, collection at instruction
+boundaries, callback resource failures and offline source/Stop/Restart acceptance
+are required. All eight existing composed resource observations remain unchanged.
+The [construction console](examples/interpreter_construction.py) composes
+metaclasses and super with suspended generators.
+
+Builtin instance layouts, custom preparation/mappings, extra class keywords,
+callable metaclass factories, additional metaclass special slots, broader
+reflection, dynamic source and async remain separately tracked in #123/#34.
+The parent milestones remain open. No publication, dependency, service or host
+capability is selected by this construction checkpoint.

README.md

@@ -172,8 +172,12 @@ functions, yield-from delegation, next/send/throw/close and scoped list/dict/set
 generator comprehensions in both profiles. [Object protocols](docs/interpreter-object-protocols.md)
 add attribute reflection and forward/reflected/in-place arithmetic in the class
 profile. Run `python -m examples.interpreter_generators`, adding `--core` for
-generators without classes. Construction, richer reflection and async retain
-separate contracts.
+generators without classes. The finite [construction profile](docs/interpreter-construction.md)
+adds owned __new__/__init__, super and lexical __class__ cells, type relations
+and type-derived metaclasses with ordinary dictionary namespaces. Run
+`python -m examples.interpreter_construction` for a console composing these
+protocols with suspended generators. Builtin instance layouts, custom namespace
+preparation, further reflection and async retain separate contracts.
 
 The [continuing interpreter roadmap](docs/interpreter-roadmap.md) targets broad
 Python 3.14+ compatibility through finite supported profiles. Execution ownership

docs/interpreter-construction.md

@@ -48,3 +48,25 @@ The semantic anchors are the Python 3.14
 and [super builtin](https://docs.python.org/3.14/library/functions.html#super).
 The pinned executable reference decides the finite cases when later patch-level
 documentation differs.
+
+## Accepted evidence
+
+The 113-case matrix has 105 adopted comparisons and eight explicit future
+refusals. Node and Chromium each pass draining and instruction-boundary execution:
+452 observations, including 436 measured zero logical teardown records. Source,
+corpus and driver hashes are checked against the retained reports. Dedicated
+tests cover callback source frames, temporary metaclasses, missing/conflicting
+class cells, notification destinations, suspended generators, every-instruction
+collection, cancellation/close and real recursion/work/allocation failures.
+All 385 Node tests pass, including the eight unchanged composed resource cases.
+
+Installed offline console acceptance has 487 program comparisons, 44 acceptance
+groups and 98 Stop/Restart cycles. New source composes construction, super,
+metaclasses and generators after offline reload. Constructor/metaclass errors
+retain their Python source diagnostics; custom preparation remains a refusal.
+The waiting class-to-core update still removes class/library authority.
+
+The [payload and source record](measurements/2026-10-26-construction.json)
+contains all 38 file sizes and hashes for the 592,822-byte construction console,
+including the receipt and deterministic compression observations. This is a
+complete local payload measurement, with no timing, device or package claim.

docs/interpreter-object-protocols.md

@@ -41,5 +41,7 @@ outer-destination roots; logical teardown must be zero.
 
 The generator console composes these protocols with suspended source functions
 and comprehensions. Offline acceptance includes freshly entered source, callback
-errors and Stop/Restart. INT-OBJECT-01 remains open for its construction, super,
-type-relation, metaclass, builtin-subclass and broader reflection slices.
+errors and Stop/Restart. The finite [construction, super, type-relation and
+metaclass slices](interpreter-construction.md) are also adopted. INT-OBJECT-01
+remains open for builtin instance layouts, additional metaclass protocols,
+custom attribute hooks and broader reflection.