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fe9d919299
Adds the CreatePriceObservations instruction to the TWAP oracle program. The instruction initialises a PriceObservations PDA for a given price source account and time window, writing the initial tick and timestamp as the first entry. Key design decisions: - Per-window accounts: each (price_source, window_duration) pair maps to a distinct PriceObservations PDA. The window duration is baked into the PDA seed so a single price source can support multiple TWAP windows (24h, 7d, 30d) at independent sampling rates without sharing a buffer. - window_duration not stored on struct: it is implicit in the PDA address. Any reader that located the account already knows the window duration used to derive it. Storing it would be redundant. - Authorization is implicit: the PriceObservations PDA is derived from the price source account ID, so is_authorized = true on the price source proves the caller controls it without a redundant authority field. - Impersonation is prevented by the PDA check: passing a controlled price source with a victim's observations account ID fails immediately because the computed PDA (from the attacker's source) does not match. Closes #126