Set flash_chip: generic

[bharvey88]

Version: 26.9.18.2

What does this implement/fix?

The CAST-1 flash runs on the generic driver (the device reports Set flash_chip: generic), so the vendor drivers linked beside it never run but keep their code in IRAM. flash_chip: generic drops them, freeing about 5 KB of internal RAM: 4,784 B measured on a CAST-1 while streaming.

flash_chip ships in ESPHome 2026.10.0. Depends on #81, which carries the min_version bump; merge after it. Draft until 2026.10.0 is out.

Types of changes

• Bugfix (fixed change that fixes an issue)
• New feature (thanks!)
• Breaking change (repair/feature that breaks existing functionality)
• Dependency Update - Does not publish
• Other - Does not publish
• Website of github readme file update - Does not publish
• Github workflows - Does not publish

Checklist / Checklijst:

• The code change has been tested and works locally
• The code change has not yet been tested

If user-visible functionality or configuration variables are added/modified:

• Added/updated documentation for the web page

🤖 Generated with Claude Code

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