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feat: Add hybrid fee estimation using mempool.space oracle for RBF (#235)

* feat: Add hybrid fee estimation using mempool.space oracle for RBF

Use Math.max(localEstimate, oracleEstimate) so estimateSmartFee with a
thin mempool doesn't produce an under-fee that stalls transactions.
Oracle URL is configurable via ARCHON_SAT_FEE_ORACLE_URL (defaults to
mempool.space for mainnet, empty/disabled for testnet/signet).

Closes #234

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix: Apply hybrid fee rate to initial anchor transaction too

Previously getHybridFeeRateSatPerVb() was only used in RBF bumps.
The initial walletAnchor call used conf_target which falls back to
Bitcoin Core's thin-mempool estimateSmartFee, producing too-low fees.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix: Off-by-one in RBF block count check

>= caused RBF to wait 2 blocks instead of feeConf blocks.
Change to > so it fires after exactly feeConf missed blocks.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* feat: Add reanchor-opid.js script to recover unconfirmed DID versions

Re-queues a dropped operation by CID directly into the gatekeeper DB,
allowing the mediator to re-anchor it on-chain and restore the
confirmation chain for affected DID versions.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix: Address PR review comments on hybrid fee estimation

- Wrap estimateSmartFee in try/catch, fall back to feeFallback on error
- Default feeOracleUrl to mempool.space only on BTC:mainnet; empty for
  testnet4/signet to avoid mainnet fee rates on test networks

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix: Remove hard-coded default for feeOracleUrl

Defaults to empty (disabled). Set ARCHON_SAT_FEE_ORACLE_URL explicitly
in .env to enable (sample.env provides the mempool.space URL).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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