diff --git a/SPECS/Workplan.md b/SPECS/Workplan.md
index e9bb0c20..87b1a443 100644
--- a/SPECS/Workplan.md
+++ b/SPECS/Workplan.md
@@ -61,6 +61,9 @@ Create a Python-based protocol compatibility wrapper that intercepts MCP respons
 ### Phase 13: Persistent Broker & Shared Xcode Session
 **Intent:** Introduce a long-lived broker connection to Xcode MCP so multiple short-lived clients can reuse one upstream session and reduce repeated Xcode permission prompts.
 
+### Phase 14: Release 0.4.0 Readiness
+**Intent:** Close release-blocking findings from the 0.4.0 readiness review across broker runtime safety, package metadata, versioning, and build compliance.
+
 ---
 
 ## 3. Tasks
@@ -2306,6 +2309,68 @@ Phase 9 Follow-up Backlog
 
 ---
 
+### Phase 14: Release 0.4.0 Readiness
+
+#### ⬜️ P14-T1: Bound per-session ID restore maps in broker transport
+- **Description:** Prevent unbounded memory growth in long-lived broker sessions by pruning/removing alias/restore entries once responses are routed (and define safe behavior when local ID space wraps).
+- **Priority:** P1
+- **Dependencies:** FU-P13-T11, FU-P13-T15
+- **Parallelizable:** no
+- **Outputs/Artifacts:**
+  - Updated `src/mcpbridge_wrapper/broker/transport.py` map lifecycle management for `id_restore`, `string_id_map`, and `int_id_map`
+  - Regression tests in `tests/unit/test_broker_transport.py` for long-lived/large-ID request streams
+- **Acceptance Criteria:**
+  - [ ] Per-session restore/alias maps do not grow unbounded for completed requests
+  - [ ] Existing ID round-trip fidelity guarantees remain intact for int and string IDs
+  - [ ] Tests cover wrap/prune behavior and pass in CI
+
+---
+
+#### ⬜️ P14-T3: Reconcile declared Python support with tested matrix
+- **Description:** Resolve mismatch between declared Python compatibility and CI coverage by aligning `requires-python`/classifiers/docs with supported and continuously-tested interpreter versions.
+- **Priority:** P1
+- **Dependencies:** none
+- **Parallelizable:** yes
+- **Outputs/Artifacts:**
+  - Updated compatibility declarations in `pyproject.toml` and documentation badges/text
+  - Updated `.github/workflows/ci.yml` matrix and/or version floor to match declared support
+- **Acceptance Criteria:**
+  - [ ] Declared Python support exactly matches tested CI versions
+  - [ ] README and packaging metadata communicate the same minimum Python version
+  - [ ] CI passes on the finalized support matrix
+
+---
+
+#### ⬜️ P14-T4: Replace deprecated setuptools license metadata with SPDX format
+- **Description:** Remove packaging deprecation warnings by migrating license metadata to modern SPDX-based fields and dropping deprecated classifiers/structures.
+- **Priority:** P2
+- **Dependencies:** none
+- **Parallelizable:** yes
+- **Outputs/Artifacts:**
+  - Updated `pyproject.toml` license metadata (`project.license` / `license-files` / classifiers as needed)
+  - Validation evidence from `python -m build` showing deprecation warnings are resolved
+- **Acceptance Criteria:**
+  - [ ] Build output no longer emits setuptools license deprecation warnings
+  - [ ] Package metadata remains valid for PyPI and MCP registry publication
+  - [ ] Existing `make check` pipeline remains green
+
+---
+
+#### ⬜️ P14-T2: Align release metadata and changelog for 0.4.0
+- **Description:** Prepare publishable 0.4.0 release metadata by updating package/registry versions and adding a complete changelog entry matching delivered functionality.
+- **Priority:** P1
+- **Dependencies:** P14-T1, P14-T3, P14-T4
+- **Parallelizable:** no
+- **Outputs/Artifacts:**
+  - Updated version fields in `pyproject.toml` and `server.json`
+  - New `0.4.0` entry in `CHANGELOG.md` with release date, key changes, and release link
+- **Acceptance Criteria:**
+  - [ ] `pyproject.toml`, `server.json`, and `CHANGELOG.md` all reference `0.4.0` consistently
+  - [ ] Changelog includes accurate notes for broker and Web UI work shipped since `0.3.2`
+  - [ ] Release metadata passes existing build/publish validation checks
+
+---
+
 
 #### ✅ FU-BUG-T7-1: Cap `pending_methods` map to guard against unbounded growth
 - **Status:** ✅ Completed (2026-02-18)