Fix broken wiki links from monthly audit

[Copilot]

Monthly link audit identified 50+ broken links including Wikipedia URLs with parentheses, stale external links, and incorrect relative paths.

Wikipedia links with parentheses

Fixed markdown parsing for URLs containing parentheses by wrapping in angle brackets:

# Before - markdown interprets ) as end of link
[Blake2b](https://en.wikipedia.org/wiki/BLAKE_(hash_function))

# After
[Blake2b](<https://en.wikipedia.org/wiki/BLAKE_(hash_function)>)

Affected: Blake2b, Pipeline, Scheduling, Multithreading, Concurrency

Internal path fixes

• learn-system-chains.md: /learn/learn-smart-contracts.md → ./learn-smart-contracts.md
• contributors.md, how-to-dyor.md, build-open-source.md: Standardized scams.md → ./scams.md

External link updates

• Avalanche docs: Migrated to docs.avax.network domain
• Ledger docs: Updated Zondax/metadata portal references
• ANSSI: ssi.gouv.fr → cyber.gouv.fr
• Signet: talisman.xyz/signet → signet.talisman.xyz
• Grants: Updated Aleph Zero, OAK; removed deprecated Edgeware

Removed dead links

• polkadotphilosophy.com article
• grillapp.net blog posts (JAM link replaced with YouTube video)
• PolkaVerse reference

Not modified

Medium/Reddit/Dune links return 403 to bots but work in browsers—not actually broken.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• docs.avax.network
  • Triggering command: /usr/bin/curl curl -sI --max-time 10 REDACTED (dns block)
• grillapp.net
  • Triggering command: /usr/bin/curl curl -sI REDACTED (dns block)
  • Triggering command: /usr/bin/curl curl -sI --max-time 10 REDACTED (dns block)
• kusama.subscan.io
  • Triggering command: /usr/bin/curl curl -sI --max-time 10 REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Monthly Audit of Wiki/Guide Links</issue_title>
<issue_description># Audit Results

File	Error	Tag	Url
/kusama/kusama-getting-started.md	404	Adversarial Cheatsheet	kusama-adverserial-cheatsheet.md
/kusama/kusama-getting-started.md	404	KSM Inflation	kusama-inflation.md
/learn/learn-comparisons-avalanche.md	404	Avalanche Consensus	https://build.avax.network/docs/quick-start/avalanche-consensus
/learn/learn-cryptography.md	404	Blake2b	https://en.wikipedia.org/wiki/BLAKE_(hash_function
/learn/learn-account-advanced.md	403	new resolver	https://medium.com/the-ethereum-name-service/ens-registry-migration-is-over-now-what-a-few-things-to-know-fb05f921872a
/learn/learn-account-advanced.md	403	ENS Multi-chain announcement	https://medium.com/the-ethereum-name-service/ens-launches-multi-coin-support-15-wallets-to-integrate-92518ab20599
/learn/learn-nominator.md	404	"Fast Unstake" section in this support article	https://support.polkadot.network/support/solutions/articles/65000169433-can-i-transfer-dot-without-unbonding-and-waiting-28-days-
/learn/learn-hyperbridge.md	403	Hyperbridge: The New Interoperability Coprocessor on Polkadot	https://medium.com/simplystaking/hyperbridge-the-new-interoperability-coprocessor-on-polkadot-b532ae622d8e
/learn/learn-xcm.md	403	XCM: The Cross-Consensus Message Format	https://medium.com/polkadot-network/xcm-the-cross-consensus-message-format-3b77b1373392
/learn/learn-xcm.md	403	XCMP Scheme	https://medium.com/web3foundation/polkadots-messaging-scheme-b1ec560908b7
/learn/learn-staking.md	403	How Nominated Proof of Stake will work in Polkadot	https://medium.com/web3foundation/how-nominated-proof-of-stake-will-work-in-polkadot-377d70c6bd43
/learn/learn-async-backing.md	404	Pipelining	https://en.wikipedia.org/wiki/Pipeline_(computing
/learn/learn-async-backing.md	404	coretime allocation	../general/polkadot-v2.md#polkadot-20-core-usage-and-functionalities
/learn/learn-async-backing.md	404	Synchronous	https://grillapp.net/10124/polkadot-s-synchronous-backing-explained-40627?ref=10124
/learn/learn-async-backing.md	404	Asynchronous Backing	https://grillapp.net/10124/polkadot-s-asynchronous-backing-explained-40701?ref=10124
/learn/learn-bridges.md	403	Wave 5	https://medium.com/web3foundation/web3-foundation-grants-wave-5-recipients-2205f4fde096
/learn/learn-bridges.md	403	Case study	https://medium.com/giveth/ethereum-dapp-scaling-poa-network-acee8a51e772
/learn/learn-parachains.md	403	Polkadot: The Parachain	https://medium.com/polkadot-network/polkadot-the-parachain-3808040a769a
/learn/learn-agile-coretime.md	404	Scheduling	https://en.wikipedia.org/wiki/Scheduling_(computing
/learn/learn-agile-coretime.md	404	Multi-threading	https://en.wikipedia.org/wiki/Multithreading_(computer_architecture
/learn/learn-agile-coretime.md	404	Concurrency	https://en.wikipedia.org/wiki/Concurrency_(computer_science
/learn/learn-jam-faq.md	404	this blog post	https://grillapp.net/@filippoweb3/gavin-s-talk-about-jam-at-token2049-dubai-136004?ref=...

• Fixes Monthly Audit of Wiki/Guide Links #6948

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