* feat(completion): complete known argument values
* fix(completion): hide Commander-hidden subcommands from completions
Replace the `__`-prefix name heuristic with Commander's `_hidden` flag so
internal subcommands registered with { hidden: true } (e.g. `mcp serve-internal`)
are excluded from completions, mirroring `ktx --help`.
* test: cover wiki and sl read command routing
* test: cover raw wiki and sl reads
* feat: add wiki read command
* feat: add sl read command
* feat: complete read command entity names
* docs: document wiki and sl read commands
* test: include read commands in command tree
* feat(sl): read and validate unique sources by name
* feat(sl): make read and validate connection id optional
* fix(completion): dedupe semantic source names
* docs(sl): document connection-optional read and validate
* fix(sl): require connection id for query command
* docs(sl): clarify query connection requirement
* fix(completion): don't resolve option values as subcommands
resolveCommand skipped flag tokens but not the value consumed by a
value-taking option in the `--flag value` form, so a connection id like
`query` was matched as the `sl query` subcommand and yielded no `sl`
completions. Track value-taking options and skip their consumed value
before matching subcommands.
* test(telemetry): assert first-run notice via TELEMETRY_NOTICE constant
CI (which tests this branch merged with main) failed because #243 changed
the first-run notice wording in identity.ts (dropped "anonymous") but left
this test grepping for the old literal 'ktx collects anonymous usage data',
so indexOf returned -1. Assert against the exported TELEMETRY_NOTICE
constant instead so the test tracks the source of truth and cannot drift
when the notice text changes again.
