diff --git a/docs/MIGRATION_LOG.md b/docs/MIGRATION_LOG.md
index 5aac4b4..69f7cb4 100644
--- a/docs/MIGRATION_LOG.md
+++ b/docs/MIGRATION_LOG.md
@@ -126,11 +126,12 @@ Source: code exploration 2026-06-24 on `deploy-test` @ `93f6f62`. Version **0.9.
 - [x] Bugs the SDL gate can't see, **caught by the harness**: relay global-id encoding (`to_global_id`, Model C1), float opacity defaults, and the input-instance-vs-mapping default coercion (×2).
 - [x] CI already on `-uv`; `branches:` filter removed (Phase 1). Legacy suite still drives graphene (unchanged); the harness proves the Strawberry schema matches.
 
-### Phase 4 — Deploy / CI / deps
-- [ ] Validate container build + dep install path (Dockerfile vs SF requirements); image-size pass (multi-stage)
-- [ ] Yarn resolutions hygiene — validate `serverless-s3-local` + `serverless-dynamodb` plugin chain loads (`node -e "require('s3rver')"`, `yarn sls package --stage dummy`)
-- [ ] vuln audit (pip-audit) — bumps via `pyup`
-- [ ] memory watch (keep 2096 unless evidence)
+### Phase 4 — Deploy / CI / deps ✅
+- [x] Container build path: deploy is on the shared **`deploy-to-aws-uv.yml`** (uv-aware, `docker: true`) which exports `requirements.txt` from `uv.lock` → `Dockerfile` `pip install`. Local amd64 build green; **360 MB** (< the §A3 500 MB aim → no multi-stage needed); `app.handler` (Mangum) + full Strawberry schema import in-image.
+- [x] Plugin chain loads: `require('s3rver')` + `serverless-dynamodb` OK; **no `resolutions` block needed** (no fast-xml-parser/s3rver conflict here, unlike toshi-api §4.7).
+- [x] **`pip-audit` (runtime deps): no known vulnerabilities.**
+- [x] Removed dead `serverless-wsgi` npm plugin + stale `requirements_*` scripts from `package.json`; `yarn install --mode update-lockfile` then `--immutable` clean (§4.6).
+- [x] memory kept **2096 MB** (no evidence to change).
 
 ### Phase 5 — Cutover
 - [ ] Deploy to test stage; **`cli_ab_test` prod-vs-new** differential validation (the built-in harness)
@@ -209,4 +210,12 @@ Source: code exploration 2026-06-24 on `deploy-test` @ `93f6f62`. Version **0.9.
 - SDL parity byte-identical; **11 differential checks** + full suite **88 passed / 10 skipped**; ruff + mypy(new) clean.
 - **Next:** Phase 4 (container build/deps hardening, yarn resolutions, image size) → Phase 5 cutover (`cli_ab_test` vs live).
 
+### 2026-06-24 — Phase 4: deploy/CI/deps hardening (clean pass)
+- **Container:** amd64 `docker build` green with the migrated deps (strawberry/fastapi/mangum in, pynamodb out); image **360 MB** (geo stack: matplotlib/geopandas/pyproj/shapely/solvis) — under the 500 MB aim, so single-stage is fine. `docker run … import solvis_graphql_api.app` → Mangum handler + full schema load in-image. Dep path: shared `deploy-to-aws-uv.yml` exports `requirements.txt` from `uv.lock` before the build (the local build mirrors it).
+- **Plugins / §4.7:** `require('s3rver')` + `serverless-dynamodb` load fine; **no `resolutions` needed** (solvis doesn't hit the fast-xml-parser/s3rver clash toshi-api did). `sls package --stage dummy` reaches plugin init cleanly.
+- **Vulns:** `pip-audit` on runtime deps → **none**. No `pyup` bump required.
+- **Hygiene:** dropped the dead `serverless-wsgi` npm plugin (no longer in `serverless.yml`) + stale `requirements_1/2` scripts; lockfile updated, `--immutable` clean.
+- CI already on the `-uv` test + deploy workflows. Memory stays 2096 MB.
+- **Next:** Phase 5 — deploy to test stage, run `cli_ab_test` (prod-vs-new differential), promote with a pre-staged revert, then post-healthy legacy cleanup (delete `schema/` graphene + Flask + `handler.py`, rename `strawberry_schema.py` → `schema.py`).
+
 <!-- Append new dated entries above this line as the migration proceeds. -->
diff --git a/package.json b/package.json
index c7e61e1..57931ef 100644
--- a/package.json
+++ b/package.json
@@ -6,13 +6,10 @@
     "serverless": "^4.29.0",
     "serverless-dynamodb": "^0.2.56",
     "serverless-plugin-warmup": "^8.3.0",
-    "serverless-s3-local": "^0.8.5",
-    "serverless-wsgi": "^3.1.0"
+    "serverless-s3-local": "^0.8.5"
   },
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "requirements_1": "serverless requirements clean",
-    "requirements_2": "serverless requirements cleanCache",
     "dummy_pkg": "serverless package --stage dummy",
     "deploy": "serverless deploy --stage ${STAGE}",
     "sls_doctor": "serverless doctor"
diff --git a/yarn.lock b/yarn.lock
index b602675..ab7e542 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1939,13 +1939,6 @@ __metadata:
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-  languageName: node
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   resolution: "bowser@npm:2.12.1"
@@ -2156,13 +2149,6 @@ __metadata:
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   resolution: "commander@npm:5.1.0"
@@ -2230,16 +2216,6 @@ __metadata:
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@@ -2259,19 +2235,6 @@ __metadata:
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-"esniff@npm:^2.0.1":
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-    event-emitter: "npm:^0.3.5"
-    type: "npm:^2.7.2"
-  checksum: 10c0/7efd8d44ac20e5db8cb0ca77eb65eca60628b2d0f3a1030bcb05e71cc40e6e2935c47b87dba3c733db12925aa5b897f8e0e7a567a2c274206f184da676ea2e65
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@@ -2509,15 +2405,6 @@ __metadata:
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-"ext@npm:^1.4.0, ext@npm:^1.7.0":
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-  dependencies:
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-  checksum: 10c0/a8e5f34e12214e9eee3a4af3b5c9d05ba048f28996450975b369fc86e5d0ef13b6df0615f892f5396a9c65d616213c25ec5b0ad17ef42eac4a500512a19da6c7
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@@ -2632,22 +2519,6 @@ __metadata:
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-"fs2@npm:^0.3.9":
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-  resolution: "fs2@npm:0.3.16"
-  dependencies:
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-    deferred: "npm:^0.7.11"
-    es5-ext: "npm:^0.10.64"
-    event-emitter: "npm:^0.3.5"
-    ext: "npm:^1.7.0"
-    ignore: "npm:^5.3.2"
-    memoizee: "npm:^0.4.17"
-    type: "npm:^2.7.3"
-  checksum: 10c0/9faaf5568aa6b5176dfa850c1da0dad09e96e8d1eb91b19a25c5ad7c1d411660feab65d603e7435b222914f0397be5c1a57a5be7f80b3c498515bf70da1939c5
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@@ -2819,13 +2690,6 @@ __metadata:
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-"ignore@npm:^5.3.2":
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   resolution: "immediate@npm:3.0.6"
@@ -2906,13 +2770,6 @@ __metadata:
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-"is-promise@npm:^2.2.2":
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@@ -3148,7 +3005,7 @@ __metadata:
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-"lodash@npm:^4.17.21, lodash@npm:^4.17.5":
+"lodash@npm:^4.17.5":
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@@ -3183,15 +3040,6 @@ __metadata:
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-  dependencies:
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@@ -3213,22 +3061,6 @@ __metadata:
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-"memoizee@npm:^0.4.14, memoizee@npm:^0.4.17":
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-"next-tick@npm:^1.0.0, next-tick@npm:^1.1.0":
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@@ -3516,18 +3341,6 @@ __metadata:
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@@ -3748,19 +3561,6 @@ __metadata:
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-"serverless-wsgi@npm:^3.1.0":
-  version: 3.1.0
-  resolution: "serverless-wsgi@npm:3.1.0"
-  dependencies:
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-    command-exists: "npm:^1.2.9"
-    fs-extra: "npm:^11.2.0"
-    lodash: "npm:^4.17.21"
-    process-utils: "npm:^4.0.0"
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@@ -3834,7 +3634,6 @@ __metadata:
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     serverless-plugin-warmup: "npm:^8.3.0"
     serverless-s3-local: "npm:^0.8.5"
-    serverless-wsgi: "npm:^3.1.0"
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@@ -3980,16 +3779,6 @@ __metadata:
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-"timers-ext@npm:^0.1.7":
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-  resolution: "timers-ext@npm:0.1.8"
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