Prepare v0.4.0-alpha.1 release

[flyingrobots]

Summary

• bump edict-syntax to 0.4.0-alpha.1
• add publish-ready v0.4.0-alpha.1 release notes
• move v0.4 changes into a dated changelog section
• refresh release-process policy, topic shelf, docs index, README, and roadmap signposts
• add the v0.4 release-policy regression

Closes #39

Verification

• RED: cargo test -p xtask release_policy failed before v0.4 release policy and changelog metadata existed
• GREEN: cargo test -p xtask release_policy
• cargo xtask verify

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 2460e7e0-dd91-4eb2-bf86-20b44779fa80

📥 Commits

Reviewing files that changed from the base of the PR and between 6dcea15 and 71c4600.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (11)

• CHANGELOG.md
• README.md
• ROADMAP.md
• crates/edict-syntax/Cargo.toml
• docs/README.md
• docs/releases/v0.3.0-alpha.1.md
• docs/releases/v0.4.0-alpha.1.md
• docs/topics/release-process/README.md
• docs/topics/release-process/policy.toml
• docs/topics/release-process/test-plan.md
• xtask/src/main.rs

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