[codex] Fix math progression and prepare TestFlight 1.1.3

[yagomp]

What changed

• fixed premature chapter completion during math sessions by tracking completed exercises explicitly and guarding against duplicate submissions
• fixed comparison exercises so both sides can no longer resolve to the same value
• restored the missing match-connect instruction text in all supported app languages
• bumped the iOS project versioning for the new TestFlight train to 1.1.3 (77)
• included the current local doc and video assets that were in the working tree

Why

• chapter completion could trigger in the middle of a 20-exercise run because resume state was inferred too loosely
• comparison exercise generation could produce equal-valued choices like 10-10 and 2-2
• the match-connect instruction strings existed but were dropped by the SwiftUI view structure
• App Store Connect rejected uploads to the closed 1.1.2 train, so the project had to move to 1.1.3

Validation

• built and archived the iOS app successfully for App Store distribution
• exported an IPA successfully with explicit signing
• uploaded TestFlight build 77 for version 1.1.3, now VALID in App Store Connect

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