Keep Bluetooth Proxy on for legacy BLE builds

[bharvey88]

Version: 26.7.29.1

What does this implement/fix?

The Bluetooth Proxy switch does restore from flash, but the _OFF half of
RESTORE_DEFAULT_OFF only decides the boot where nothing is stored yet, which is
the first boot after the switch shipped. MSR-1_BLE.yaml inherited that mode from
Core, so a legacy BLE device that had always proxied comes up with the proxy off
after updating and stays that way until the user finds the switch. Reported in ApolloAutomation/MSR-2#92.

Core now reads the mode from a bluetooth_proxy_restore_mode substitution
defaulting to RESTORE_DEFAULT_OFF, and MSR-1_BLE.yaml overrides it to
RESTORE_DEFAULT_ON, the same override pattern that file already uses for its OTA
manifest URLs. The unified image is unchanged, and a user's saved choice still wins
on every later boot.

Validated with esphome config on 2026.7.2 across MSR-1.yaml, MSR-1_BLE.yaml
and MSR-1_Factory.yaml. Rendered switch: standard RESTORE_DEFAULT_OFF, BLE
RESTORE_DEFAULT_ON.

Matching PRs go to AIR-1, MSR-2 and MTR-1, which carry the identical switch and BLE variant.

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

Summary by CodeRabbit

• New Features
  • Added configurable Bluetooth Proxy restoration behavior.
  • Bluetooth Proxy can restore its configured state after startup, factory reset, or firmware updates.
  • Legacy BLE device support remains enabled by default on MSR-1 devices during updates.
• Improvements
  • BLE scanning now follows the restored Bluetooth Proxy state, improving consistency after restart or reset.
  • Updated firmware to version 26.8.18.1.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: c8d26a05-757a-4aec-bbc8-2b9e6ed9b569

📥 Commits

Reviewing files that changed from the base of the PR and between 388de43 and 1370f2a.

📒 Files selected for processing (1)

• Integrations/ESPHome/Core.yaml

🚧 Files skipped from review as they are similar to previous changes (1)

• Integrations/ESPHome/Core.yaml

Included review availability: Your plan includes up to 2 reviews per rolling hour; 1 remains after this review.

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Walkthrough

The ESPHome core configuration now exposes Bluetooth Proxy restore behavior as a substitution. It defaults to off and applies to the proxy switch. The BLE configuration overrides it to restore on. The firmware version is updated.

Changes

Bluetooth Proxy restore configuration

Layer / File(s)	Summary
Core restore-mode wiring Integrations/ESPHome/Core.yaml	Updates the firmware version, defines the default restore mode, updates the boot comment, and applies the substitution to the Bluetooth Proxy switch.
BLE restore override Integrations/ESPHome/MSR-1_BLE.yaml	Sets Bluetooth Proxy restoration to RESTORE_DEFAULT_ON for the BLE variant.

Estimated code review effort: 2 (Simple) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 1370f

The change preserves saved Bluetooth Proxy choices while enabling the intended default for legacy BLE builds; no actionable merge-blocking risk remains beyond normal checks and review.

Poem

A rabbit checks the proxy light,
Core keeps its default mode right.
BLE restores the setting on,
Firmware hops to version dawn.
YAML settles in just right.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: keeping Bluetooth Proxy enabled for legacy BLE builds.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ble-proxy-restore-on

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