docs: refresh README to reflect current addon state (#45)

[Xerrion]

Description

Refreshes README.md so it accurately reflects the addon as it sits on master. No source code changes.

Type of Change

• Documentation update

Related Issues

Closes #45

Testing

• Luacheck passes (luacheck .) - no Lua changes
• All claims verified against current source on master (TOC, listener files, slash dispatcher, event registration, defaults)
• Tested in-game manually - N/A, docs only
• WoW version(s) tested on: N/A (documentation only)

Changes

• Removed all Cataclysm Classic references (no Interface-Cata in TOC, no Core_Cata.lua exists)
• Fixed Supported Versions table to match the current TOC and actual listener filenames at the repo root
• Corrected the Configuration scope claim from per-character to account-wide (matches ## SavedVariables: RaidLogAutoDB)
• Added the 5-second M+ post-completion grace period to How It Works
• Added a new Events Handled table covering the 5 registered events
• Added a Dependencies note highlighting zero external libraries (no Ace3, no LibStub)
• Added Wago.io badge and link
• License link uses master branch

Checklist

• My code follows the project's code style (4-space indent, 120 char lines)
• I have tested my changes in-game - N/A, docs only
• Luacheck reports no warnings
• My commits follow conventional commit format

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 8011d08d-4fdb-45f8-bbea-cf9f19ec09b3

📥 Commits

Reviewing files that changed from the base of the PR and between c38749b and 50cd820.

📒 Files selected for processing (1)

• README.md

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