fix(macos): codesign KDF with hardened runtime and timestamp

[CharlVS]

This PR ensures KDF artifacts are properly codesigned for macOS notarization.

Available for testing in KomodoPlatform/komodo-wallet#3175

Changes:

• Codesign KDF executable and libkdflib.dylib in all build configurations.
• Use --options runtime and --timestamp=auto on all signatures.
• Keep Release-only re-sign step after arch thinning (lipo) to maintain valid signature.

Result:

• All executable Mach-O files embedded by the plugin should verify with Apple timestamp in notarization checks.

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[Copilot]

Pull Request Overview

This PR enhances macOS code signing for the KDF (Komodo DeFi Framework) executable and library to satisfy notarization requirements by adding hardened runtime and timestamp options to all codesign operations.

• Updates existing Release-only codesign operations to include --options runtime and --timestamp=auto
• Adds new codesign operations for all configurations (not just Release) with the same hardened runtime options
• Improves error messaging with additional troubleshooting instructions

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[github-actions]

Visit the preview URL for this PR (updated for commit ffa7663):

https://komodo-playground--pr240-fix-kdf-signing-beek61zp.web.app

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[github-actions]

Visit the preview URL for this PR (updated for commit ffa7663):

https://kdf-sdk--pr240-fix-kdf-signing-mq2hdvwh.web.app

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[CharlVS]

Fixes per review: codesign helper, newline formatting, avoid Release double-signing

• Implemented kdf_codesign to DRY codesign calls with --options runtime and --timestamp=auto.
• Use printf for proper newline formatting in missing-files error; removed backticks around the flutter command guidance line.
• Prevent double signing: generic signing only for non-Release; Release re-signs after lipo thinning.
• Changes in: sdk/packages/komodo_defi_framework/macos/komodo_defi_framework.podspec
• Commit: ffa7663