docs: remove deprecated CLI from Snowflake docs

[AntTheLimey]

What

The pgEdge CLI is deprecated, but the Snowflake docs still instruct
users to configure snowflake.node with ./pgedge commands. This
rewrites those instructions to be deployment-aware and SQL-based.

docs/creating.md

• Removes the CLI-driven pgedge spock node-create, pgedge db guc-set, and pgedge reload steps (and the "9 nodes or fewer"
  auto-numbering narrative that only existed because of the CLI).
• Adds a "managed deployment" section: the Control Plane (node
  ordinal), Helm charts (node name), and Ansible (zone) each set
  snowflake.node automatically.
• Adds a "manual" section using ALTER SYSTEM SET snowflake.node
  plus SELECT pg_reload_conf();, keeping pg_ctl reload as the
  shell alternative.

README.md

• Drops the "pgEdge binary" install phrasing in favor of "your
  pgEdge deployment or from source".

Verification

• snowflake.node range (1-1023) and PGC_SUSET context confirmed
  against snowflake.c.
• Per-platform node numbering confirmed in control-plane, pgedge-helm,
  and pgedge-ansible.
• No residual ./pgedge / CLI references remain in the docs.

Targets main; picked up by the next tagged Snowflake release.

[coderabbitai]

📝 Walkthrough

Walkthrough

The documentation updates revise Snowflake installation wording and replace CLI-focused snowflake.node setup instructions with managed-deployment and manual-configuration paths, including reload commands.

Changes

Snowflake setup documentation

Layer / File(s)	Summary
Installation guidance README.md	Installation instructions now refer to installing the Snowflake extension with a pgEdge deployment or from source code.
Node configuration guidance docs/creating.md	Instructions now describe unique node identifiers, automatic assignment for managed deployments, manual configuration options, and configuration reload procedures.

Poem

I’m a rabbit with docs in my paws,
Tuning Snowflake’s setup laws.
Deployments assign, or numbers you set,
Reload the server—no worries yet.
From source or pgEdge, the path is clear,
Sequences hop onward, bright and dear.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: removing deprecated CLI instructions from the Snowflake docs.
Description check	✅ Passed	The description clearly matches the documentation updates and references the same CLI-to-SQL changes described in the diff.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/remove-deprecated-cli

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/creating.md`:
- Around line 17-22: Update the installation example around ALTER SYSTEM SET
snowflake.node to state that this command must be executed by a superuser, while
leaving the existing node identifier and reload instructions unchanged.
- Around line 17-27: Update the installation guidance around the ALTER SYSTEM
and postgresql.conf examples to state that they are alternative configuration
methods. Explain that ALTER SYSTEM writes to postgresql.auto.conf and can
override the postgresql.conf value, instructing readers to use one method or
remove/reset any existing ALTER SYSTEM setting before switching.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: fcd7594d-efe6-464b-b6a8-33a35250a7eb

📥 Commits

Reviewing files that changed from the base of the PR and between fce5e57 and 00e200f.

📒 Files selected for processing (2)

• README.md
• docs/creating.md