refactor(lsp): make prog-general the single owner of LSP config

prog-lsp.el was required by nothing. The (require 'prog-lsp) line was commented out and later deleted, so none of its config ever ran. prog-general's LSP block was the only policy in effect, which is why the build/cache file-watch ignore list added in April never applied and the "watch all files?" prompt kept firing.

Fold prog-lsp's settings into prog-general and delete the module. This adopts its quiet, performance-first policy. Doc popups, symbol highlighting, snippets, signature help, and modeline diagnostics go off. Idle-delay drops to 0.5, the eldoc provider is stripped from the global hook, and read-process-output-max rises to 1MB. The file-watch ignore list now applies: the daemon carries all thirteen build/cache patterns, six of which lsp-mode already ships by default.

Language-specific server variables and the lsp-deferred mode hooks stay in the per-language modules.

Consolidate the two prog-lsp test files into one test-prog-general-lsp.el: twelve tests covering the file-watch and eldoc helpers across Normal, Boundary, and Error, plus the load-time invariants.

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