chore(plugin): release plugin v0.2.4 with server v0.2.2

[Platonenkov]

Ships the code_search payload reduction from #29 to plugin users. Release server-v0.2.2 is published.

Two A/B measurements found this tool costing more tokens than plain Grep — most recently +25.7% on a clean index while making 26% fewer tool calls. The mechanism was isolated rather than guessed at: code_search averaged 9,086 tokens per call against Grep's 5,348. It finds things in fewer searches and then loses on what each one returns.

	before	after
excerpt lines per hit	15	5
default limit	10	5
measured response, 8 queries	11,421 chars	5,187 chars

−54.6%, roughly a third of it from the shorter excerpt and the rest from the lower default.

Whether that is enough to make the tool cheaper than Grep is not yet known — the third measurement runs next, and the published benchmark numbers are historical until it lands.

The release cut cleanly on the second run this time, which is the first evidence that the fixed-point fix from #26 actually works: placeholder → read CI's checksum → commit → re-tag → green.

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