create-alias & stage-scoped ops use frozen COREZOID_STAGE_ID -> cryptic "Object is not in stage"

[vladyslavsamokysh-beep]

Context

create-alias (and listAliasesByStage / env-var ops) resolve the stage from COREZOID_STAGE_ID, read once at MCP spawn (main.go). When that value isn't the stage where the target process lives, create-alias fails with Object is not in stage, which doesn't hint at the stage mismatch.

Example: a process living in project stage 10605 while the env had COREZOID_STAGE_ID=9026 (another project's stage) -> create-alias failed; push-process still worked (it targets by obj_id from the file).

Suggestions (any one would help)

1. Derive the stage from the target process's actual location instead of the env stage.
2. Accept an optional stage_id override param on stage-scoped tools.
3. Improve the error: include expected vs configured stage_id.

Note on the alias-create contract

Creating an alias via the raw API needs obj_to_id + obj_to_type: "conv" (plus project_id), not obj_id/obj_type. Using obj_id creates an alias with obj_to_id: null, which then resolves at runtime as not_found_conv_by_alias. Worth guarding in create-alias.

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