feat: add explicit opt-in CLI telemetry controls

[affaan-m]

Summary

Adds a public, explicit-consent control surface for privacy-minimized ECC CLI usage telemetry.

This PR does not enable collection:

• telemetry is off by default and has no install-time hook;
• no default collection endpoint is shipped;
• ecc telemetry enable is the only persisted opt-in;
• ECC_TELEMETRY=0 is a hard override;
• the Itō/RFQ command is excluded entirely;
• arguments, prompts, paths, usernames, repositories, credentials, RFQs, prices, supply, and demand are absent from the schema;
• failed delivery is dropped rather than queued and never changes the parent command result;
• endpoint-bound rotating IDs support deletion against every original receiver.

The architecture note explicitly blocks configuring a public endpoint until the privacy notice, lawful basis, processor terms, retention, source-IP logging, deletion behavior, and small-cohort controls are reviewed.

Validation

• npm test: 3,191/3,191
• npm run lint: pass
• npm run prepack: pass
• npm pack --dry-run: pass
• git diff --check: pass

Release boundary

Draft intentionally. Do not publish a package version or configure ECC_TELEMETRY_ENDPOINT from this PR. Server-side privacy and legal controls still require independent review.

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[ecc-tools]

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[ecc-tools]

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[ecc-tools]

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[ecc-tools]

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[ecc-tools]

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