Fix: SafeHarbor script output

[SidestreamFrostyFig]

Description

While working on the spell 2026-03-26, we identified three minor points regarding Safe Harbor:

• The script outputs additional header // ---------- Bug Bounty Updates ----------, which resulted in two headers inside the spell and made it slightly confusing to read, so to address this, we have removed the harcoded header generated by the script
• The README of the Safe Harbor script contained a broken link. We have updated it to point to the audited commit referenced in the forum post, which contains the registry contracts
• The script output was somewhat noisy, so we added --silent flag to Safe Harbor commands to reduce noise and removed ; cd - since make runs commands in subshells and no need to return to the previous directory manually

Contribution Checklist

• PR title starts with (PE-<TICKET_NUMBER>)
• Code approved
• Tests approved
• CI Tests pass

Checklist

• Every contract variable/method declared as public/external private/internal
• Consider if this PR needs the officeHours modifier override
• Verify expiration (30 days unless otherwise specified)
• Verify hash in the description matches here
• Validate all addresses used are in changelog or known
• Notify any external teams affected by the spell so they have the opportunity to review
• Deploy spell ETH_GAS_LIMIT="XXX" ETH_GAS_PRICE="YYY" make deploy
• Verify mainnet contract on etherscan
• Change test to use mainnet spell address and deploy timestamp
• Run make archive-spell or make date="YYYY-MM-DD" archive-spell to make an archive directory and copy DssSpell.sol, DssSpell.t.sol, DssSpell.t.base.sol, and DssSpellCollateralOnboarding.sol
• squash and merge this PR

[SidestreamBurningBanana]

Approving after running both scripts:

$ make safeharbor-generate
cd scripts/safeharbor && npm --silent ci && npm run --silent generate
Fetching chains details CSV...
Fetching CSV from https://docs.google.com/spreadsheets/d/1e_KOYOeBGaA5EG3Xqco6lOP_a0zV4Vrm3w5-dqFk00U/export?format=csv&gid=1620276618
Downloading contracts in scope CSV...
Fetching CSV from https://docs.google.com/spreadsheets/d/1e_KOYOeBGaA5EG3Xqco6lOP_a0zV4Vrm3w5-dqFk00U/export?format=csv&gid=1121763694
Fetching on-chain state...
Generating updates...
No updates to generate

$ make safeharbor-inspect
cd scripts/safeharbor && npm --silent ci && npm run --silent inspect
Fetching chains details CSV...
Fetching CSV from https://docs.google.com/spreadsheets/d/1e_KOYOeBGaA5EG3Xqco6lOP_a0zV4Vrm3w5-dqFk00U/export?format=csv&gid=1620276618
Downloading contracts in scope CSV...
Fetching CSV from https://docs.google.com/spreadsheets/d/1e_KOYOeBGaA5EG3Xqco6lOP_a0zV4Vrm3w5-dqFk00U/export?format=csv&gid=1121763694
Fetching on-chain state...
Generating updates...
No updates to generate