Create 2026-06-04-content.md

[jc-sumo]

Purpose of this pull request

This pull request adds CSIEM Content release notes for today

Select the type of change

• Minor Changes - Typos, formatting, slight revisions
• Update Content - Revisions, updating sections
• New Content - New features, sections, pages, tutorials
• Site and Tools - .clabot, version updates, maintenance, dependencies, new packages for the site (Docusaurus, Gatsby, React, etc.)

Ticket (if applicable)

[kimsauce]

Suggested change

	- log mappers
	- parsers
	- schema
	- rules

[kimsauce]

Suggested change

	* This content release includes:
	- Updated MITRE ATT&CK tactic and technique tags across 89 rules to align with the MITRE ATT&CK v19 framework update, which reorganized the former Defense Evasion tactic into Stealth and the new Defense Impairment tactic
	- Affected rules now reference the correct successor techniques and tactic identifiers, ensuring accurate threat classification in detection workflows
	- Additional changes are enumerated below
	This content release includes:
	- Updated MITRE ATT&CK tactic and technique tags across 89 rules to align with the MITRE ATT&CK v19 framework update, which reorganized the former Defense Evasion tactic into Stealth and the new Defense Impairment tactic
	- Affected rules now reference the correct successor techniques and tactic identifiers, ensuring accurate threat classification in detection workflows
	- Additional changes are enumerated below

[kimsauce]

had a few suggestions @jc-sumo