docs: sync with ckb v0.207.0

[humble-little-bear]

This PR syncs the Nervos CKB documentation with the upstream ckb v0.207.0 release (2026-06-10). The previous recorded release was v0.206.0, so the diff range is v0.206.0...v0.207.0.

Changes applied

CKB change	Docs file	What changed
script/src/syscalls/load_header.rs: load_header now treats unconfirmed tx-pool Cells (PoolCell) as missing and returns CKB_ITEM_MISSING instead of panicking.	website/docs/script/syscalls-for-script.mdx	Updated ckb_load_header description to note CKB_ITEM_MISSING for unconfirmed Cells.
script/src/syscalls/load_block_extension.rs: same CKB_ITEM_MISSING behavior for unconfirmed tx-pool Cells.	website/docs/script/syscalls-for-script.mdx	Updated ckb_load_extension description to note CKB_ITEM_MISSING for unconfirmed Cells.
docs/devnet-from-existing-data.md: split Mainnet/Testnet [params] examples; Mainnet requires genesis_epoch_length = 1743, Testnet keeps the default 1000.	website/docs/node/run-devnet-node.mdx	Added a note under the epoch-length section explaining that devnets initialized from existing Mainnet/Testnet data must preserve the source chain's genesis_epoch_length.

Release diff reference

• Full compare: nervosnetwork/ckb@v0.206.0...v0.207.0
• Key files reviewed:
  • script/src/syscalls/load_header.rs
  • script/src/syscalls/load_block_extension.rs
  • docs/devnet-from-existing-data.md
  • rpc/README.md (only a grammar fix; no docs.nervos.org page references this text)
  • rpc/src/util/fee_rate.rs (internal overflow/robustness fix; no user-facing RPC change)
  • util/constant/src/default_assume_valid_target.rs / latest_assume_valid_target.rs (assume-valid target updates; not documented on docs.nervos.org)

Items needing manual confirmation

• None of the RPC grammar changes in rpc/README.md / util/jsonrpc-types/src/indexer.rs are reflected on docs.nervos.org because the site does not currently include the generated RPC type descriptions. If a dedicated RPC reference page is added later, the phrasing "An array representing..." should be used.
• The rpc/src/server.rs HTTP timeout status-code change and the fee_rate.rs internal averaging fix are implementation details with no visible configuration or RPC contract change, so they are not documented here.

Breaking / high-priority notes

• Script behavior: ckb_load_header and ckb_load_extension now return CKB_ITEM_MISSING (error code 2) for unconfirmed tx-pool Cells instead of aborting the VM. Scripts that previously relied on the abort behavior should handle CKB_ITEM_MISSING explicitly.

Autopilot record

.autopilot/last_ckb_release.txt is updated to v0.207.0.

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Project	Deployment	Actions	Updated (UTC)
nervos-ckb-docs	Ready	Preview, Comment	Jun 16, 2026 6:38am

[Copilot]

Pull request overview

This PR updates docs.nervos.org to match the upstream CKB v0.207.0 release, primarily documenting updated syscall behavior around tx-pool (unconfirmed) Cells and clarifying devnet initialization requirements when reusing Mainnet/Testnet data.

Changes:

• Documented that ckb_load_header and ckb_load_extension return CKB_ITEM_MISSING for unconfirmed tx-pool Cells (instead of aborting).
• Added guidance that devnets initialized from existing Mainnet/Testnet data must preserve the source chain’s genesis_epoch_length to avoid genesis hash mismatches.
• Bumped the autopilot tracked upstream release to v0.207.0.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
website/docs/script/syscalls-for-script.mdx	Updates syscall table descriptions to reflect CKB_ITEM_MISSING behavior for unconfirmed tx-pool Cells.
website/docs/node/run-devnet-node.mdx	Adds a note warning about genesis_epoch_length requirements when initializing from Mainnet/Testnet data.
.autopilot/last_ckb_release.txt	Records the synced upstream CKB version as v0.207.0.

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