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* [VAULT-43364] pipeline: add template generation support Add a new `template` to the `pipeline generate` command tree. It allows rendering Go text templates with pipeline requests available via context functions. The new system is now product agnostic and can be used to generate any template we wish. This will supersede the enos specific configuration command. We also add support for multiple cadences when fetching the list of release versions. Previously it was assumed that we followed a minor version bump cadence when fetching versions with an n-minus style lower bound. Now we can specify the major or minor cadence. To support a migration from one cadence to another you can also specify an prior cadence and the version at which the transition happened. This allows the n-3 reverse traversal to drop into the prior cadence if/when necessary. **Template Rendering System** - New `pipeline generate template` command renders Go templates with pipeline data access - Supports stdin/stdout or file-based input/output - Templates access version data via function calls rather than pre-populated context **Version Cadence Support** - Added `VersionCadence` type with `minor` and `major` release cadence tracking - Supports cadence transitions (e.g., minor→major) with `TransitionVersion` and `PriorCadence` fields - Calculates version ranges respecting different release cadences **Template Functions** - `VersionsNMinus` / `VersionsBounded` - List versions with explicit cadence parameter - `VersionsNMinusTransition` / `VersionsBoundedTransition` - Handle cadence transitions - `ParseVersion`, `CompareVersions`, `FilterVersions` - Version utilities - All functions require cadence to be explicitly specified **CLI Integration** - `--version` and `--edition` flags expose current version/edition to templates - Templates reference these via `.Version` and `.Edition` context fields **Enos Migration** - Converted `enos-dynamic-config.hcl` to template-based generation - Uses `VersionsNMinusTransition` to handle Vault's minor→major cadence shift at 1.21.5 Signed-off-by: Ryan Cragun <me@ryan.ec> Co-authored-by: Ryan Cragun <me@ryan.ec>