feat(ledger-protocol-transition-map): map protocol version changes in ledger ranges

[Caneryy]

Summary

Adds a read-only Ledger Protocol Transition Map that scans a bounded Horizon ledger range and groups adjacent protocol versions.

• Validates start ledger + bounded count before fetching
• Groups contiguous same-version ledgers into runs
• Marks exact transitions only when both neighboring sequences were fetched
• Flags sequence gaps / partial pages so upgrades are not asserted across missing data
• Shows network, range, and a copyable transition summary

Files

Entire slice under features/ledger-protocol-transition-map/ (35 files).

Out of scope

• No unbounded history scan
• No prediction of future upgrades
• No changes outside this feature folder

Test plan

• npm run verify:features -- ledger-protocol-transition-map
• npm test -- --run features/ledger-protocol-transition-map (43 tests)

Closes #470

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