Reconcile config/docs for TOML-only rate-limit fields and legacy JSON stdin aliases

[Copilot]

Nightly docs reconciliation flagged three drift points: TOML-only rate-limit fields in ServerConfig still advertised JSON tags, TAVILY_API_KEY missing from AGENTS.md, and undocumented legacy JSON stdin timeout aliases. This PR aligns implementation metadata and operator-facing docs with current behavior.

• Config metadata: make TOML-only intent explicit

  • Updated ServerConfig.RateLimitThreshold and ServerConfig.RateLimitCooldown to json:"-" in internal/config/config_core.go.
  • Keeps TOML support unchanged while removing misleading JSON deserialization signals.

• Behavior guardrail: assert tag contract

  • Added a focused test in internal/config/rate_limit_config_test.go to assert both rate-limit fields are excluded from JSON tags.

• Docs: close gaps in agent/operator references

  • Added TAVILY_API_KEY to the environment variable list in AGENTS.md.
  • Documented accepted legacy JSON stdin aliases connect_timeout and tool_timeout (preferred: connectTimeout/toolTimeout) in:
    • README.md
    • AGENTS.md

// internal/config/config_core.go
RateLimitThreshold int `toml:"rate_limit_threshold" json:"-"`
RateLimitCooldown  int `toml:"rate_limit_cooldown" json:"-"`

[Copilot]

Pull request overview

Aligns configuration metadata and operator/agent documentation with the gateway’s actual behavior around TOML-only rate-limit fields and legacy JSON stdin timeout aliases, reducing drift flagged by nightly docs reconciliation.

Changes:

• Mark ServerConfig rate-limit fields as TOML-only by excluding them from JSON tags (json:"-").
• Add a unit test asserting the JSON tag exclusion contract for those rate-limit fields.
• Update README/AGENTS docs to mention legacy JSON stdin timeout aliases and add TAVILY_API_KEY to the environment variable list.

Show a summary per file

File	Description
README.md	Documents legacy JSON stdin timeout aliases for backward compatibility.
internal/config/rate_limit_config_test.go	Adds a reflection-based test asserting rate-limit fields are excluded from JSON tags.
internal/config/config_core.go	Updates rate-limit struct tags to json:"-" to reflect TOML-only support.
AGENTS.md	Documents legacy JSON stdin timeout aliases and adds TAVILY_API_KEY to env var list.

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• Files reviewed: 4/4 changed files
• Comments generated: 1