Add entry alias redirects

[samdark]

Summary

• parse aliases front matter on entries
• write redirect pages from aliases to the resolved entry permalink
• include aliases in dry-run/output tracking while keeping them out of feeds and sitemap
• document aliases and mark the roadmap item complete

Tests

• make test -- --filter testParseEntryAliases
• make test -- --filter testBuildGeneratesRedirectsForEntryAliases
• make psalm
• make test

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9440f107-d75b-44e0-8aa4-26fade326147

📥 Commits

Reviewing files that changed from the base of the PR and between 7c44058 and 6fb9654.

📒 Files selected for processing (8)

• docs/content.md
• psalm-baseline.xml
• roadmap.md
• src/Console/BuildCommand.php
• src/Content/Model/Entry.php
• src/Content/Parser/EntryParser.php
• tests/Unit/Console/BuildCommandTest.php
• tests/Unit/Content/Parser/EntryParserTest.php

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-entry-aliases

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