docs: add MIR13 mode doc and set PHI-off as default; bridge lowering split (if/loop/try); llvmlite resolver stabilization; curated runner default PHI-off; refresh CURRENT_TASK.md

docs/specs/aot_plan_v1.md

@@ -1,37 +0,0 @@
-# AOT-Plan v1 Schema (Phase 15.1)
-
-Status: draft-frozen for Phase 15.1 (extensions via `extensions` object only)
-
-- version: string, must be "1"
-- name: optional plan/module name
-- functions: array of PlanFunction
-- externs: optional array of extern identifiers (reserved; not required in 15.1)
-- exports: optional array of export names (reserved)
-- units: optional array of link units (reserved)
-- extensions: optional object for forward-compatible keys
-
-PlanFunction:
-- name: string
-- params: array of { name: string, type?: string } (informational in 15.1)
-- return_type: optional string; one of: integer, float, bool, string, void (or omitted → Unknown)
-- body: optional object with tagged `kind`
-  - kind = "const_return": { value: any-json (int/bool/float/string supported) }
-  - kind = "empty": returns default 0 with Unknown type (Phase 15.1 importer behavior)
-
-Notes:
-- 15.1 importer does not emit object code; it constructs MIR13 skeletons only.
-- If `return_type` is omitted, importer uses Unknown to keep VM dynamic display.
-- `extensions` is a free-form map; the importer ignores unknown keys.
-
-Example:
-```
-{
-  "version": "1",
-  "name": "mini_project",
-  "functions": [
-    { "name": "main", "return_type": "integer", "body": { "kind": "const_return", "value": 42 }},
-    { "name": "greet", "return_type": "string",  "body": { "kind": "const_return", "value": "hi" }}
-  ]
-}
-```
-