feat: contributor mode, session awareness, recommendation format (#90)

* feat: contributor mode, session awareness, universal RECOMMENDATION format

- Rename {{UPDATE_CHECK}} → {{PREAMBLE}} across all 10 skill templates
- Add session tracking (touch ~/.gstack/sessions/$PPID, count active sessions)
- ELI16 mode when 3+ concurrent sessions detected (re-ground user on context)
- Contributor mode: auto-file field reports to ~/.gstack/contributor-logs/
- Universal AskUserQuestion format: context → question → RECOMMENDATION → options
- Update plan-ceo-review and plan-eng-review to reference preamble baseline
- Add vendored symlink awareness section to CLAUDE.md
- Rewrite CONTRIBUTING.md with contributor workflow and cross-project testing
- Add tests for contributor mode and session awareness in generated output
- Add E2E eval for contributor mode report filing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: add Enum & Value Completeness to /review critical checklist

New CRITICAL review category that traces new enum values, status strings,
and type constants through every consumer outside the diff. Catches the
class of bugs where a new value is added but not handled in all switch/case
chains, allowlists, or frontend-backend contracts.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* chore: bump v0.4.1, user-facing changelog, update qa-only template and architecture docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* docs: add CHANGELOG style guide — user-facing, sell the feature

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* docs: rewrite v0.4.1 changelog to be user-facing and sell the features

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: add evals for RECOMMENDATION format, session awareness, and enum completeness

Free tests (Tier 1): RECOMMENDATION format + session awareness in all
preamble SKILL.md files, enum completeness checklist structure and CRITICAL
classification.

E2E eval: /review catches missed enum handlers when a new status value
is added but not handled in case/switch and notify methods.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: add E2E eval for session awareness ELI16 mode

Stubs _SESSIONS=4, gives agent a decision point on feature/add-payments
branch, verifies the output re-grounds the user with project, branch,
context, and RECOMMENDATION — the ELI16 mode behavior for 3+ sessions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: contributor mode eval marked FAIL due to expected browse error

The test intentionally runs a nonexistent binary to trigger contributor
mode. The session runner's browse error detection catches "no such file
or directory...browse" and sets browseErrors, causing recordE2E to mark
passed=false. Override passed to check only exitReason since the browse
error is the expected scenario.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

test/fixtures/review-eval-enum-diff.rb

@@ -0,0 +1,30 @@
+# Feature branch version: adds "returned" status but misses consumers
+class Order < ApplicationRecord
+  STATUSES = %w[pending processing shipped delivered returned].freeze
+
+  validates :status, inclusion: { in: STATUSES }
+
+  def display_status
+    case status
+    when 'pending'    then 'Awaiting processing'
+    when 'processing' then 'Being prepared'
+    when 'shipped'    then 'On the way'
+    when 'delivered'  then 'Delivered'
+    # BUG: 'returned' not handled — falls through to nil
+    end
+  end
+
+  def can_cancel?
+    # BUG: should 'returned' be cancellable? Not considered.
+    %w[pending processing].include?(status)
+  end
+
+  def notify_customer
+    case status
+    when 'pending'    then OrderMailer.confirmation(self).deliver_later
+    when 'shipped'    then OrderMailer.shipped(self).deliver_later
+    when 'delivered'  then OrderMailer.delivered(self).deliver_later
+    # BUG: 'returned' has no notification — customer won't know return was received
+    end
+  end
+end

test/fixtures/review-eval-enum.rb

@@ -0,0 +1,27 @@
+# Existing file on main: order model with status handling
+class Order < ApplicationRecord
+  STATUSES = %w[pending processing shipped delivered].freeze
+
+  validates :status, inclusion: { in: STATUSES }
+
+  def display_status
+    case status
+    when 'pending'    then 'Awaiting processing'
+    when 'processing' then 'Being prepared'
+    when 'shipped'    then 'On the way'
+    when 'delivered'  then 'Delivered'
+    end
+  end
+
+  def can_cancel?
+    %w[pending processing].include?(status)
+  end
+
+  def notify_customer
+    case status
+    when 'pending'    then OrderMailer.confirmation(self).deliver_later
+    when 'shipped'    then OrderMailer.shipped(self).deliver_later
+    when 'delivered'  then OrderMailer.delivered(self).deliver_later
+    end
+  end
+end