#583 extension push --dry-run --json reports local helper imports as bogus model entries

Summary

swamp extension push --dry-run --json reports local helper imports as bogus model entries in the dry-run preview. The real registry/catalog record appears clean, so this looks like a cosmetic dry-run preview bug rather than actual publication corruption.

Reproduction

No AWS credentials needed; this is only publisher dry-run metadata.

git clone https://github.com/jentz/swamp-extensions.git
cd swamp-extensions

swamp extension push aws-rds-inventory/manifest.yaml --dry-run --json \
  | jq -s 'map(select(type == "object" and has("models")))[0].models'

Actual output

The dry-run preview includes _lib/retry.ts as a model:

[
  {
    "type": "aws-rds-inventory/_lib/retry.ts",
    "fileName": "aws-rds-inventory/_lib/retry.ts"
  },
  {
    "type": "@jentz/aws-rds-inventory",
    "fileName": "aws-rds-inventory/aws_rds_inventory.ts",
    "globalArguments": [
      {
        "name": "region",
        "type": "string",
        "required": false
      },
      {
        "name": "selector",
        "type": "string",
        "required": true
      }
    ]
  }
]

The manifest only declares the real entrypoint:

models:
  - aws_rds_inventory.ts

The model imports the helper normally:

import { withRetry } from "./_lib/retry.ts";

Expected output

The dry-run preview should list only the manifest-declared model entry:

[
  {
    "type": "@jentz/aws-rds-inventory",
    "fileName": "aws-rds-inventory/aws_rds_inventory.ts",
    "globalArguments": [...]
  }
]

_lib/retry.ts should be bundled as an internal dependency, not surfaced as a model.

Second confirming repro

Same behavior with sibling extension:

swamp extension push aws-rds-reservations/manifest.yaml --dry-run --json \
  | jq -s 'map(select(type == "object" and has("models")))[0].models'

Actual includes:

{
  "type": "aws-rds-reservations/_lib/retry.ts",
  "fileName": "aws-rds-reservations/_lib/retry.ts"
}

Why this looks like a dry-run preview bug, not a registry corruption bug

The already-published registry record for @jentz/aws-rds-inventory is clean:

swamp extension info @jentz/aws-rds-inventory --json \
  | jq '{contentTypes, contentNames}'

Returns only the real model:

{
  "contentTypes": ["models"],
  "contentNames": ["aws-rds-inventory"]
}

So the actual catalog does not appear to publish _lib/retry.ts; only the local extension push --dry-run --json preview is misleading.

Impact

This is cosmetic but outward-facing: dry-run suggests helper modules will be published as bogus model surfaces. That makes pre-publish review confusing and could lead extension authors to avoid normal static imports or restructure helpers unnecessarily.

Suspected cause

The dry-run model preview likely walks the resolved/bundled module graph and classifies any local .ts file under the extension root as a model, instead of filtering display rows back to manifest.yaml's declared models: entrypoints.

Environment

Observed with swamp CLI version 20260606.235053.0-sha.d4ff2b04.