chore: prepare 0.4.0 release

[whoisjayd]

What changed / why

• Change: Bump release version to 0.4.0 across all synchronized locations: pyproject.toml, package version, UI template, k8s deployment manifest, tests, and changelog.
• Why: Delivers the 0.4.0 minor release containing machine-readable CLI outputs, local contributor smoke environment, live IPv6 testing, offline deployment validation, compatibility policy, and CodeQL security hardening.

AI assistance disclosure

• AI assistance was used and disclosed; the ai-assisted label should be applied.
• Tools and use: Automated release synchronization according to Section 16 of AGENTS.md.
• Accountable human: Jaydeep Solanki (@whoisjayd).

Evidence and tests

• Full quality gates and test suite passed locally with 88.37% coverage.
• Python package distribution built and twine check passed.

Summary by Sourcery

Prepare the 0.4.0 release with synchronized version metadata and the documented feature, testing, and security improvements included in the release.

New Features:

• Add machine-readable JSON output modes for diagnostic and benchmark CLI commands.
• Add contributor smoke testing, live IPv6 integration coverage, offline deployment validation, compatibility guidance, and expanded protocol integration tests.

Bug Fixes:

• Harden path traversal protections for upload and ZIP endpoints.
• Prevent HTTP response splitting through attachment filename sanitization.

Build:

• Bump the project and synchronized release artifacts to version 0.4.0.

Documentation:

• Publish the 0.4.0 changelog and normative compatibility policy.

[sourcery-ai]

Reviewer's Guide

This release-preparation PR synchronizes all tracked version references to 0.4.0, updates the deployment image and version tests, and adds the 0.4.0 changelog entry summarizing the shipped CLI, testing, deployment, compatibility, protocol, and security improvements. Reviewers should verify that no version-bearing locations remain stale and that the lockfile, package metadata, runtime endpoint, UI, and Kubernetes tag agree.

File-Level Changes

Change	Details	Files
Synchronize the project version to 0.4.0 across packaging, runtime metadata, user-facing UI, deployment configuration, and version assertions.	Update the package metadata and lockfile release version. Update the exported runtime version and operational endpoint expectations. Update the UI display and Kubernetes image tag. Record the 0.4.0 changelog entry and release date.	pyproject.toml uv.lock blazeserve/__init__.py blazeserve/ui.py deploy/k8s/deployment.yaml tests/integration/test_operational_endpoints.py tests/unit/test_version.py CHANGELOG.md
Document the functionality and security improvements included in the 0.4.0 release.	Summarize machine-readable CLI output, contributor smoke testing, IPv6 coverage, offline deployment validation, compatibility policy, and protocol tests. Document path traversal barriers and response-splitting sanitization.	CHANGELOG.md

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[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 5ceb58db-8b3a-4052-859b-a32245e6e1ed

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="pyproject.toml" line_range="7" />
<code_context>
 [project]
 name = "blazeserve"
-version = "0.3.1"
+version = "0.4.0"
 description = "⚡ Ultra-fast HTTP file server with advanced performance optimizations, real-time metrics, and production-ready architecture — supports byte-range/multi-range downloads, TLS, Basic Auth, throttling, uploads, streaming ZIP, CORS, and a polished CLI."
 readme = { file = "README.md", content-type = "text/markdown" }
</code_context>
<issue_to_address>
**nitpick:** The 0.4.0 release is not listed as supported in SECURITY.md; its supported-version table still marks only 0.3.x, so users of the current release are incorrectly told that their version is unsupported.

**Triggers:** When users consult the security policy after upgrading to 0.4.0.

**Suggested fix:** Update SECURITY.md to include 0.4.x as the supported release range and adjust the older-version entry accordingly.
</issue_to_address>

Sourcery assessment

Needs a human reviewer. The Kubernetes manifest now deploys the v0.4.0 container image; if that tag is missing or faulty, a rollout could fail to start pods or cause an outage. Reverting restores the previous image reference, but any outage during the rollout has already occurred.

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[sourcery-ai]

nitpick: The 0.4.0 release is not listed as supported in SECURITY.md; its supported-version table still marks only 0.3.x, so users of the current release are incorrectly told that their version is unsupported.

Triggers: When users consult the security policy after upgrading to 0.4.0.

Suggested fix: Update SECURITY.md to include 0.4.x as the supported release range and adjust the older-version entry accordingly.