tinyhttp / tinyhttp / 21562883674 / 2

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Remove ipaddrjs (#484)

* refactor(proxy-addr): use native net.isIP for IP validation

Replace ipaddr.isValid with Node.js built-in net.isIP function
for basic IP address validation.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* refactor(proxy-addr): replace ipaddr.js with native Node.js net.BlockList

- Remove ipaddr.js dependency entirely
- Use net.BlockList for subnet matching
- Add helper functions for:
  - IPv4-mapped IPv6 detection and conversion
  - Netmask to CIDR prefix conversion
  - IP address normalization
- All 83 proxy-addr tests pass

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* test(proxy-addr): add tests for uncovered code paths

- Test long-form IPv4-mapped address (0:0:0:0:0:ffff:x.x.x.x)
- Test /32 netmask (255.255.255.255)
- Test malformed IPv4-mapped address (::ffff:1)
- Fix substring index for long-form mapped addresses (14 -> 15)
- Update pnpm-lock.yaml after removing ipaddr.js

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* chore: changeset

* refactor(proxy-addr): remove redundant validation in netmaskToPrefix

The check for valid IPv4 parts (length === 4, values 0-255) was unreachable
because net.isIP() already validates the format before this code runs.
Removing it improves branch coverage to 100%.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

982 of 1003 branches covered (97.91%)

Branch coverage included in aggregate %.

1309 of 1314 relevant lines covered (99.62%)

87.16 hits per line