v0.16.2

fix(release): match the MCP registry namespace casing (#448)

Follow-up to #446. The v0.16.1 `publish-mcp-registry` job failed with a
403: the registry's GitHub OIDC grant is case-sensitive
(`io.github.Ataraxy-Labs/*`, the org's exact casing) while we published
as `io.github.ataraxy-labs/sem`. The registry also compares the npm
package's `mcpName` to the server name with exact equality, so the
already-published 0.16.1 wrapper (lowercase `mcpName`) can't be reused.

- Renames the server to `io.github.Ataraxy-Labs/sem` in `server.json`,
`package.json` (`mcpName`), and the CHANGELOG entry
- Bumps 0.16.1 → 0.16.2 (no code changes) so merging republishes npm
with the corrected `mcpName` and reruns the registry publish

`server.json` re-validated against the registry schema (the name pattern
allows uppercase).