Delete ticket 018/019 files (already resolved by merged branch)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o

tickets/018-boolean-param-kind.md

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-# Support a boolean param kind that's always present (true/false, not omitted)
-
-Discovered while scoping the "IsError" docs use case (see ticket 019): declaring a param today always requires a capture group, and a param is *omitted* from a line's fields (not `false`/empty) whenever its regex doesn't match (`src/engine.rs`, `LogEntryDto::params` build path — "A param is omitted (not included as null/empty) when its regex/capture group doesn't match"). There's also no boolean kind — `MetricPrimitiveKind` (`src/data_value.rs`) only has `String`, `Number`, `Timestamp`, `Duration`.
-
-This blocks a use case like declaring a param `IsError` that's `true` for any message matching `error` (case-insensitively) and `false` for every other message — today a non-matching line just doesn't get the param at all, and there's no boolean type to hold the result even if it did.
-
-## Acceptance criteria
-- `MetricPrimitiveKind` gains a `Boolean` variant (`src/data_value.rs`), serialized as `"boolean"` consistent with the other lowercase kinds.
-- A param declared with kind `Boolean` doesn't require (or use) a capture group for its value — its value is whether `message_match_regex` matches the line, case-insensitively or per the regex's own flags.
-- A `Boolean`-kind param is present on every line as `true` or `false` (never omitted), unlike capture-based params.
-- Params UI (`Params.tsx`) offers `boolean` as a kind option and hides/disables the capture-group input when it's selected (or clarifies it's unused).
-- Existing string/number/timestamp/duration param behavior (including the "omitted when unmatched" semantics for those) is unchanged.

tickets/019-docs-isError-use-case.md

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-# Add an "IsError" worked example to the Parameters docs
-
-From WISHLIST.md: add a use case to the docs showing how to create a parameter `IsError` that's `true` for any message containing "error" (case-insensitive) and `false` otherwise.
-
-Add a worked example to the "Parameters" section in `webapp/src/components/Docs.tsx` (alongside the existing `duration` worked example) showing how to declare a boolean `IsError` param: regex `(?i)error`, kind `boolean`, no capture group needed, true/false on every line.
-
-This use case surfaces missing functionality — today params always need a capture group and are *omitted* (not `false`) on non-matching lines, and there's no boolean kind. Ticket 018 (boolean param kind) was created to cover that missing functionality; this docs ticket depends on it landing first (so the worked example describes real, working behavior) — indicate in the doc's example that it relies on the boolean param kind.
-
-## Acceptance criteria
-- Depends on ticket 018 (boolean param kind) — implement/land that first.
-- "Parameters" section in `Docs.tsx` gets a new worked example: declaring `IsError` with regex `(?i)error`, kind `boolean`, showing it as `true`/`false` on every log line.
-- The existing `duration` worked example and surrounding prose are otherwise unchanged.