build(deps): bump kysely from 0.27.4 to 0.28.14 in /console - #35669

### Motivation

`yarn gen:types` fails with `function "pg_get_serial_sequence" does not
exist`. kysely-codegen runs kysely's Postgres introspector for its table
query. Since the bump to kysely 0.28 (#35669), that query calls
`pg_get_serial_sequence`, which Materialize lacks. kysely 0.29 still
does. The query also lists only relkinds `r`, `v` and `p`, so the
catalog's builtin materialized views (`m`) never reached the types under
kysely-codegen 0.17. #40044's types were generated with both patched by
hand in `node_modules`.

This also bumps kysely to 0.29 and kysely-codegen to 0.20, superseding
#39686.

### Description

- `bin/kysely-codegen.ts` runs kysely-codegen programmatically with an
introspector that overrides only the table query. kysely-codegen's
materialized view query, enum handling and serializer still apply.
- The script writes the copyright header to `types/materialize.d.ts`.
The codegen output lacks it, and the copyright lint fails without it.
- `bin/generate-types` exits on errors, pulls the requested image (a
cached `latest` went stale), and stops the container on exit. Before,
each run left a container bound to port 6875, and the next run generated
types from that old container.
- kysely 0.28.17 → 0.29.8 and kysely-codegen 0.17 → 0.20.0:
- 0.29 rejects `limit(sql.raw(...))`. `rawLimit` and the lag history
limit now call `query.limit(sql.lit(n))`, which still inlines the limit
as a literal, as Materialize requires.
- `rawLimit` used to append its limit with `modifyEnd`. In 0.29,
compiling end modifiers calls `Array.prototype.toSorted`, which Chrome
109 lacks. No console query uses end modifiers now. Neither `rawLimit`
caller has an OFFSET or another end modifier, so the compiled SQL is
unchanged.
- kysely 0.29 is ESM-only and kysely-codegen 0.20 `require`s it, so
`yarn gen:types` needs Node 22.12 or later. CI and the Volta pin run
Node 26, and #39683 updates `engines.node`.
- `types/materialize.d.ts` is regenerated against v26.49.1.
kysely-codegen 0.17 and 0.20 produce identical output.
  - Adds `mz_builtin_columns` and `mz_builtin_index_columns`.
- Builtin columns lose their `Generated<>` wrappers, because #40316
changed `pg_attribute.atthasdef` to report no default for them. The
console only selects from these relations, where `Generated<T>` and `T`
read the same.
- Drops the two hand-added `TODO` markers from #39992. The generator now
emits `mz_cluster_auto_scaling_strategies` and
`mz_cluster_reconfigurations`, and `AUTO_SCALING_MIN_VERSION` still
gates them at runtime. The file is now exactly the generator output.

Worth checking on the preview, since these run the changed limits:
- the Query History list;
- a sink's Errors tab;
- the freshness lag charts on the environment overview and the cluster
pages.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

### Motivation

Renovate opens a batch of dependency PRs every week. CI catches most
breaks, but last month's Console upgrades hit several it can't see:

- renamed config that the new version silently ignores (msw 3's
`onUnhandledRequest`);
- dev scripts CI never runs (`yarn gen:types` was broken from #35669
until #40550);
- APIs and syntax old browsers lack (kysely 0.29's `toSorted`,
string-width 8's `v`-flag regexes);
- Node floors above `engines.node`;
- layout jsdom can't measure (visx 4's `ParentSize`);
- version holds a later bump undid (react-virtualized-auto-sizer in
#40521).

### Description

Adds the `mz-renovate-triage` skill.

- `SKILL.md` sorts open Renovate PRs by risk, checks what CI can't, and
posts one verdict comment per PR for the approver (Ready to approve,
Needs changes, Needs a decision, Waiting on CI, Superseded). It edits
that comment in place on later runs and skips PRs whose head hasn't
changed. It never approves, merges, closes, labels or pushes.
- `lessons.md` records what the Console upgrades of October and November
needed, as rules and as a table by package, each with the PR that taught
it.
- A row in `.agents/skills/README.md`.

A scheduled routine runs the skill twice a week. It can also be run by
hand, where it shows the comments and asks before posting.

🤖 Generated with [Claude Code](https://claude.com/claude-code)