Files
Sameen Karim e208dfc488 Create/update stack on remote during sync (#156)
* Create/update the remote stack on sync and fix false "Stack synced"

`gh stack sync` reported "Stack synced" even when it had not created or
updated the stack object on GitHub. After running `gh stack init` to
adopt existing branches and then opening PRs outside the CLI, `gh stack
sync` detected the open PRs and printed "Stack synced" — but no stack had
ever been created on the server.

There were two distinct bugs:

1. Sync never reconciled the remote stack object. `runSync` called
   `syncStackPRs`, which only *reads* PR state and links PRs to local
   branches; it never called the create/update path. So the branches were
   rebased and pushed and the PRs were detected, but the stack on GitHub
   was never created.

2. The final message was unconditional. `runSync` always printed "Stack
   synced", which is supposed to mean "the stack object on GitHub now
   reflects the local stack" — something that can only be true when two or
   more open PRs exist and the remote stack was actually created/updated.

Fix

Reconcile the remote stack from sync, and make the closing message reflect
what actually happened.

* cmd/sync.go
  - Add a reconciliation step (5b) after PR-state sync: when the stack has
    two or more open PRs, link them into a stack on GitHub via the new
    `syncRemoteStack` helper. It inspects existing stacks first and:
      - short-circuits quietly when a remote stack already lists exactly
        these PRs (records the ID, prints "Stack already up to date on
        GitHub") so routine syncs don't issue a redundant, misleading
        update;
      - otherwise delegates to `syncStack` to create a new stack, adopt an
        untracked one, or update a partially-formed one.
    Sync never opens PRs — that remains `gh stack submit`'s job.
  - Replace the unconditional "Stack synced" with a result-driven message:
    "Stack synced" when the remote stack object was created/updated/in
    sync, otherwise "Branches synced" (fewer than two PRs, stacked PRs
    unavailable, a cross-stack divergence, or no GitHub client).
  - Update the command's long description to document the stack-object
    step and the two possible closing messages.

* cmd/submit.go
  - Thread a `synced bool` return through the existing, tested stack
    helpers so sync can tell whether the remote stack object now matches
    local: `syncStack`, `createNewStack`, and `updateStack` now return
    `bool`; `adoptRemoteStack` returns `(handled, synced)`; and
    `handleCreate422` returns `bool` (true only when the PRs are already
    stacked together). Extract the shared `stackPRNumbers` helper.
  - This is additive: submit's single call site ignores the new return
    value, so submit's behavior, output, and tests are unchanged. Reusing
    these helpers (instead of duplicating the 404/422 handling in sync)
    keeps the create/adopt/update logic in one tested place.

Tests

* cmd/sync_test.go — six new cases covering the reconciliation matrix:
  - TestSync_CreatesRemoteStackWhenPRsExist: open PRs but no remote stack
    -> CreateStack is called and the new ID is persisted to the stack file;
    output contains "Stack created on GitHub" and "Stack synced".
  - TestSync_AdoptsExistingEqualRemoteStack: a matching remote stack ->
    no create/update, ID recorded, "Stack synced".
  - TestSync_UpdatesPartialRemoteStack: a subset stack -> UpdateStack with
    the full PR list, "Stack synced".
  - TestSync_FewerThanTwoPRs_BranchesSynced: one PR -> no stack API calls,
    "Branches synced", not "Stack synced".
  - TestSync_StacksUnavailable_BranchesSynced: 404 on create -> warns,
    "Branches synced".
  - TestSync_PRsSpanMultipleStacks_BranchesSynced: PRs across two stacks ->
    divergence warning, no create/update, "Branches synced".

Docs

Document the new stack-object step and the "Stack synced" vs "Branches
synced" distinction in:
  - README.md
  - docs/src/content/docs/reference/cli.md
  - skills/gh-stack/SKILL.md
  - docs/src/content/docs/introduction/overview.md
  - docs/src/content/docs/guides/stacked-prs.md
  - docs/src/content/docs/guides/workflows.md

* Address PR review: one ListStacks per sync, command-neutral guidance

Two follow-ups from the #156 review (both flagged optional / non-blocking).

1. Remove the redundant ListStacks round-trip on sync's create path.
   syncRemoteStack fetched the stack list for its already-up-to-date
   short-circuit, then delegated to syncStack -> adoptRemoteStack, which
   listed the stacks again — two GETs on the first-sync-create and
   membership-changed paths. Refactor adoptRemoteStack into a list-accepting
   reconcileUntrackedStack(cfg, client, s, prNumbers, stacks): syncStack now
   fetches the list once and passes it down, and syncRemoteStack reuses the
   list it already fetched. Net: exactly one ListStacks per sync. This also
   drops the (handled, synced) tuple. Submit's behavior is unchanged.

2. Make the divergence / dropped-PR guidance command-neutral. The shared
   helper emitted submit-specific wording ("reconcile them before
   submitting", "...then `gh stack submit`") that is now reachable from
   `gh stack sync`. Reword to "reconcile them first" and drop the trailing
   `gh stack submit` so it reads correctly from either command.

Tests: assert exactly one ListStacks on the create path and that the
divergence guidance is not submit-specific.

* increment skill file version

* Simplify sync reconciliation: reuse syncStack instead of a parallel path

Review feedback noted the change felt heavier than the fix warranted.
The weight came from `syncRemoteStack` (cmd/sync.go), a near-duplicate of
submit's `syncStack` — same <2-PR guard, ListStacks, and update/create
dispatch — that existed only to add an "already up to date" short-circuit.
That one optimization is what spawned the second entry point, the
pre-fetched-list threading, and the double-ListStacks it then required.

Collapse it to a single reconciliation path:

- Remove `syncRemoteStack`; `gh stack sync` now calls the shared
  `syncStack` directly. One path, one ListStacks per sync.
- Fold `createNewStack` into `reconcileUntrackedStack` (renamed from
  `adoptRemoteStack`) so it returns a single `synced bool` instead of a
  `(handled, synced)` tuple and owns its own ListStacks again.
- Inline `stackPRNumbers` back into `syncStack` (it was only extracted to
  share with the now-removed `syncRemoteStack`).
- Drop the now-unused `strconv`/`github` imports from cmd/sync.go.

Behavior note: a routine re-sync of an already-tracked stack now prints
"Stack updated on GitHub with N PRs" instead of "Stack already up to date
on GitHub". This is accurate (sync does PUT the current state) and matches
submit. The "Stack synced" / "Branches synced" summary is unchanged, and
submit's behavior is unchanged.
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