v0.2.0

0.2.0

• Parse pda.seeds metadata from Anchor IDL account specs (const and arg seed kinds).
• Auto-derive PDA addresses in generated instruction builders — no more manual address math for programs that use #[account(seeds = [...], bump)].
• Instruction.account DSL accepts a pda: kwarg with declarative seed specs.
• Pda.seed_type_for_idl translates IDL arg type strings to Pda.to_seed symbols.
• Generator raises a clear error when a PDA seed path does not match any instruction argument (after stripping leading underscores).
• Generator normalizes leading-underscore arg names (e.g., Rust _poll_id → Ruby :poll_id).
• Bugfix: Pda.on_curve? now strips the Ed25519 sign bit (top bit of byte 31) before interpreting the y coordinate. Previously, ~50% of on-curve addresses were misclassified as off-curve, causing find_program_address to pick a higher bump than Anchor and produce a mismatched PDA. Also rejects non-canonical y values (y >= 2^255 - 19) and handles the x² = 0 edge case correctly.