ci: re-enable escrow, token-swap, external-delegate anchor examples

These three Anchor examples were already migrated to Anchor 1.0.0 with
complete Rust (litesvm/solana-kite) test suites, but were still listed in
.ghaignore for reasons that no longer apply:

- finance/escrow/anchor: old reason was a JS helpers bug (#40); the test
  is now pure Rust, so that bug is irrelevant. Verified: anchor test green
  (4/4 + lib test).
- finance/token-swap/anchor: verified anchor build + 18/18 tests pass.
- tokens/external-delegate-token-master/anchor: verified 3/3 tests pass.

All three verified locally with Anchor 1.0.0, Solana CLI, and surfpool,
matching the CI flow (anchor keys sync -> anchor build -> anchor test).

Also clarifies basics/pyth/anchor's ignore reason: it fails because
pyth-solana-receiver-sdk 1.1.0 pulls a borsh version incompatible with
Anchor 1.0 / Solana 3.x (PriceUpdateV2 fails BorshDeserialize). Left
ignored pending a compatible upstream SDK.

https://claude.ai/code/session_013dpnF6uSGWXjkJJZseqzcP

Author: claude

.github/.ghaignore

@@ -12,9 +12,9 @@ tokens/transfer-tokens/native
 tokens/token-minter/native
 tokens/create-token/native
 
-finance/token-swap/anchor
-
-# not building
+# not building: pyth-solana-receiver-sdk 1.1.0 pulls a borsh version that
+# conflicts with Anchor 1.0 / Solana 3.x (PriceUpdateV2 fails BorshDeserialize).
+# Blocked on an upstream SDK release compatible with solana 3.x.
 basics/pyth/anchor
 
 # not building
@@ -23,10 +23,6 @@ compression/cnft-vault/anchor
 # builds but need to test on localhost
 compression/cnft-burn/anchor
 
-# test failing
-# https://github.com/solana-developers/helpers/issues/40
-finance/escrow/anchor
-
 # not live
 tokens/token-extensions/group/anchor
 tokens/token-extensions/group/quasar
@@ -35,10 +31,6 @@ tokens/token-extensions/group/quasar
 basics/cross-program-invocation/quasar
 
 
-
-# error in tests
-tokens/external-delegate-token-master/anchor
-
 # build failed - program outdated
 tokens/token-extensions/metadata/anchor