docs(bot): document ov_server.api_key_type and exp_write_tools (#1994 + #2007)

[r266-tech]

Summary

Document two bot.ov_server config fields added by recent feat PRs:

• api_key_type (added by feat(bot):Support user-key OpenViking mode and align memory namespaces #1994, merged 2026-05-13): root (default) keeps the original root-key fanout behavior; user switches the bot to the user-key flow for OpenViking client calls.
• exp_write_tools (added by feat(vikingbot): self-evolving agent memory with experience injection #2007, merged 2026-05-13): list of tool names that trigger experience-memory injection before invocation (self-evolving agent memory loop). Defaults to ["write_file", "edit_file"].

Both fields exist in OpenVikingConfig (bot/vikingbot/config/schema.py) but were not documented in bot/README.md or bot/README_CN.md. This patch adds 2 bullets per file (4 lines total, additive only) to the existing ov_server sub-list — same byte-mirror style as the surrounding root_api_key / account_id entries.

Why call out the agent_memory_enabled gate on exp_write_tools

exp_write_tools only takes effect when the OpenViking server has memory.agent_memory_enabled = true (defined in openviking_cli/utils/config/memory_config.py as MemoryConfig.agent_memory_enabled: bool = False, checked by openviking/session/compressor_v2.py). That gate lives in a different config namespace (server-side memory.*, not bot-side bot.ov_server.*), so the bullet states it explicitly to avoid the surprise of "I set exp_write_tools but nothing happens."

Verification

• api_key_type: schema line api_key_type: Literal["root", "user"] = "root" (bot/vikingbot/config/schema.py:513), validator strips/lowercases input. Doc keeps to the verified contract from feat(bot):Support user-key OpenViking mode and align memory namespaces #1994 body wording; full client flow deferred to the source PR.
• exp_write_tools: schema line exp_write_tools: list[str] = Field(default_factory=lambda: ["write_file", "edit_file"]) (bot/vikingbot/config/schema.py:519). Gate verified at compressor_v2.py:46 (if not getattr(config.memory, "agent_memory_enabled", False): return []).
• No competing PR touches bot/README*.md for these fields (sibling-PR check clean).

Diff scope

• 4 line additions total (2 bullets in EN, 2 bullets in ZH).
• No formatting/style edits on existing content.
• No code changes.

Codex adversarial review

• Round 1 (gpt-5.5 xhigh): VERDICT: needs-attention — flagged missing agent_memory_enabled gate on exp_write_tools (0.85) and overclaimed api_key_type lifecycle (0.55).
• Round 2 (gpt-5.5 xhigh) on this V2: VERDICT: approve — both findings resolved by tightening wording and adding the gate disclosure.

🤖 Generated with Claude Code

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PR Reviewer Guide 🔍

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🎫 Ticket compliance analysis ✅ 2007 - Fully compliant Compliant requirements: Document api_key_type and exp_write_tools config fields Update both English and Chinese README files 1994 - Fully compliant Compliant requirements: Document api_key_type config field Update both English and Chinese README files

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🏅 Score: 100

🧪 No relevant tests

🔒 No security concerns identified

✅ No TODO sections

🔀 No multiple PR themes

⚡ No major issues detected

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