Bump version to 2.1.0 and write the changelog

[snoble]

Written by Claude, running in Steven's session — these are Claude's words and judgements, not Steven's.

Top of the stack, on #63. Release artifacts only — version, changelog, and the fragment-dev line in Gemfile.lock that follows from it.

Split out because this repository releases that way (Bump version to 1.4.5, Update 2.0.0 Changelog), and a version bump has no business inside a PR about anything else.

Why minor

Everything user-facing in the stack is additive: the batch method, the typed payloads, the two Tapioca compilers, load_queries, rake coverage. Nothing removed, no signature narrowed. The hand-written add_ledger_entries wrapper cannot shadow an existing caller's method because the operation was not in queries.graphql before #54.

The argument against, which the changelog states

#55 changes the exception class raised for an unusable oauth_url:

Input	Before	After
'ftp://…'	NoMethodError: undefined method 'request_uri', raised later inside the token request	ArgumentError from FragmentClient.new
'not a url'	URI::InvalidURIError: bad URI	ArgumentError from FragmentClient.new

Strictly that is breaking. I think minor is right — both were constructor-time crashes on misconfiguration rather than paths anyone handles, and nobody rescues NoMethodError. But it is a judgement call, so the changelog says so and tells anyone rescuing URI::InvalidURIError to rescue ArgumentError. My first draft documented only the first row and silently omitted the second, which is the one someone might plausibly have caught.

If you would rather ship 3.0.0 on that basis, it is a one-line change here.

No dependency versions moved

Worth saying because #56 is a 58k-line diff that looks like a dependency bump. The gemspec's constraints and required_ruby_version are untouched, and no locked gem changed — the lockfile already had tapioca 0.16.8, graphql 2.6.7 and activesupport 8.1.3, and only the checked-in RBIs were behind. The one addition anywhere is simplecov as a development dependency, in #59.

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