docs: add Continue MCP integration guide

[Soumoditya]

What & why

Adds integrations/continue-dev/CONNECT.md and TOOLS.md for the Continue integration requested in #149's body (its title currently says Windsurf). The guide covers Streamable HTTP, requestOptions.headers, local secrets, and an always-applied project rule. It preserves the distinction between agent instructions and executor-side enforcement.

References: Continue's current MCP guide, config.yaml reference, local-secret documentation, and rules guide, linked in CONNECT.md.

Test plan

• Parsed the YAML configuration and rule frontmatter with js-yaml; verified the secret reference remains literal and alwaysApply is true.
• Checked relative documentation links and git diff --cached --check.
• Compared the five tool names and action policy with the existing integrations.
• An authenticated Continue session was not available. The guide explicitly says this and includes manual connection and blocked/needs_human checks. Draft pending that validation.

Before you open this

• Commit has an author-matching DCO sign-off.
• Documentation-only; no runtime, tenant, or extraction behavior changes.
• Follows the existing CONNECT.md / TOOLS.md structure.
• Authenticated Continue smoke test.

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