Add CONTEXT.md for AI agent consumption

[Debashich]

Add a concise CONTEXT.md describing common tkn workflows,

conventions, output formats, and behavioral notes for AI agents.

Fixes #2856

Assisted-by: Claude Sonnet 4.6

Changes

• Add a new CONTEXT.md file documenting common tkn workflows, conventions, output formats, and behavioral guidance for AI agents.

• Ran make check locally. The command fails because of existing lint issues in unrelated files, no new issues were introduced by this documentation only change.

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes tests (if functionality changed/added)
• Run the code checkers with make check
• Regenerate the manpages, docs and go formatting with make generated
• Commit messages follow commit message best practices

See the contribution guide
for more details.

Release Notes

[tekton-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
To complete the pull request process, please assign vinamra28 after the PR has been reviewed.
You can assign the PR to them by writing /assign @vinamra28 in a comment when ready.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Debashich / name: Debashich (e59eb97)